Food Science and Technology
Sabri Sudirman; Bernica Toyba; Herpandi Herpandi; Indah Widiastuti; Puspa Ayu Pitayati; Miftahul Janna; Rahmadiana Utami
Abstract
Purpose: Oxidative stress is a condition caused by an imbalance between free radicals and the body's antioxidant defense system. Antioxidants are substances that reduce or inhibit the formation of free radicals. This study aimed to evaluate the effects of different extraction temperatures on the polyphenol ...
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Purpose: Oxidative stress is a condition caused by an imbalance between free radicals and the body's antioxidant defense system. Antioxidants are substances that reduce or inhibit the formation of free radicals. This study aimed to evaluate the effects of different extraction temperatures on the polyphenol content of nipa palm (Nypa fruticans) fruit husk and to determine its antioxidant activity. Research method: The nipa palm fruit husk was extracted using different temperatures (30°C, 45°C, and 60°C) and the antioxidant activity was determined using the 2,2-diphenyl-1-picrylhydrazyl method. The data were presented as mean ± standard deviation and analyzed by one-way analysis of variance (one-way ANOVA) followed by Duncan multiple comparison tests. Findings: The results showed that an extraction temperature of 60°C produced the highest total phenolic (44.50 mg Gallic acid equivalent per g of sample), flavonoid (8.75 mg Quercetin equivalent per g of sample), and tannin (50.30 mg Tannic acid equivalent per g of sample). Fourier transform infrared analysis detected hydroxyl groups, indicating the presence of polyphenol compounds in the nipa palm fruit husk extract. Furthermore, the extraction temperature of 60°C exhibited the highest radical scavenging activity (52.79%) compared to other temperatures (30°C and 45°C). These findings suggest that nipa palm fruit husk extract can serve as a natural antioxidant and has potential applications as a pharmaceutical agent. Research limitations: There were no limitations identified. Originality/Value: This study is the first to report the effect of temperature on the extraction of polyphenol content from nipa fruit husks. It also highlights the potential of nipa fruit husk extract as a natural source of antioxidant agents.
Food Science and Technology
Thanh Viet Nguyen; Le Hoang Phuc; Ngoc Quy Nguyen; Minh Tien Nguyen; Van Chi Khang
Abstract
Purpose: This study evaluated how ripening stages and anatomical parts affect the nutritional composition, physicochemical attributes, and antioxidant potential of Ri6 Durian (Durio zibethinus Murr.). The goal was to determine the optimal harvest stage and explore full fruit utilization to reduce postharvest ...
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Purpose: This study evaluated how ripening stages and anatomical parts affect the nutritional composition, physicochemical attributes, and antioxidant potential of Ri6 Durian (Durio zibethinus Murr.). The goal was to determine the optimal harvest stage and explore full fruit utilization to reduce postharvest losses. Research method: Peel, flesh, and seed samples were collected at 15 weeks (mature fruit, MF) and 17 weeks (ripe fruit, RF) after flowering. Ethanol extracts were analyzed for proximate composition, pH, titratable acidity, total soluble solids, total polyphenol content (TPC), total flavonoid content (TFC), and antioxidant activity using DPPH and ABTS assays. Findings: Ripening increased moisture (36.7-80.8%) and sugars (16.7-55.5 mg/g DW), while reducing acidity. The peel consistently exhibited the highest bioactive levels, with TPC reaching 2.91 mg GAE/g and TFC 0.21 mg QE/g at MF. Antioxidant activity was stronger in the peel, with DPPH values up to 0.67 mg AAE/g DW, exceeding ABTS activity (0.50 mg AAE/g DW). Research limitations: The study was limited to one Durian cultivar (Ri6) and two ripening stages, which may restrict generalizability to other cultivars or maturity levels. Originality/Value: This research highlights the underutilized value of Durian peel and seed for functional food or nutraceutical development, and provides practical guidance for ripening-based harvest decisions to support sustainable postharvest strategies. The findings contribute innovative insights into full-fruit utilization and promote value addition for tropical fruits, offering practical applications for both industry and farmers.
Food Science and Technology
Sonu Sharma; V. Ramana Rao Tadapaneni; Prakash R. Patel
Abstract
Purpose: The study examined the effectiveness of polysaccharide-based edible coatings enriched with citral microencapsulated in β-cyclodextrin for extending shelf-life and maintaining the quality of fresh-cut ‘Totapuri’ mango. Research Method: The sodium alginate (AG), carrageenan (CG), ...
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Purpose: The study examined the effectiveness of polysaccharide-based edible coatings enriched with citral microencapsulated in β-cyclodextrin for extending shelf-life and maintaining the quality of fresh-cut ‘Totapuri’ mango. Research Method: The sodium alginate (AG), carrageenan (CG), pectin (PT), and polycationic chitosan (CH) were applied as layer-by-layer through electrostatic deposition and single layer. The changes in quality properties of coated and uncoated fresh-cut ‘Totapuri’ mango were evaluated during 18 days of storage period at 5°C. Physicochemical properties like colour change, firmness, weight loss, carotenoids, vitamin C and phenolics were measured. Sensory characteristics such as color, taste, texture and odor were evaluated. Additionally, enzymatic activities of polygalacturonase, peroxidase, polyphenol oxidase and phenylalanine ammonia-lyase were evaluated and microbial growth was examined to check for contamination during storage. Findings: The application of AG and CH as single layer and layer-by-layer coatings especially AG+CH and CG+CH better maintained chroma (C), hue angle (h°), and lightness (L*), slowed down firmness and weight loss, retained carotenoids, vitamin C and phenolics as compared to single-layered and uncoated fresh-cut mango. Furthermore, layer-by-layer coatings of CH+AG and CH+CG reduced enzymatic activities of polygalacturonase (PG), peroxidase (POX), polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) and prevented microbial growth during 18 days of storage at 5°C. The application of alginate and chitosan as single-layered and layer-by-layer on fresh-cut ‘Totapuri’ scored the highest overall consumer acceptability when compared to other coating treatments. Research limitations: There were no limitations. Originality/Value: The study suggest that application of AG and CH as single layer and layer-by-layer polysaccharide-based edible coating of CH+AG and CH+CG are effective and safe method of preserving the quality and extending the shelf-life of fresh-cut ‘Totapuri’ mango for 18 days at 5°C.
Food Science and Technology
Shirazoom Munira; Md. Yamin Kabir; Shamim Ahmed Kamal Uddin Khan; Md. Iftekhar Shams
Abstract
Purpose: Mango is a well-known fruit in tropical and sub-tropical countries, including Bangladesh. However, mangoes are climacteric fruits and exhibit limited storage life due to a high respiration rate. Mangoes are also susceptible to particular storage pathogens at postharvest and thus possess a short ...
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Purpose: Mango is a well-known fruit in tropical and sub-tropical countries, including Bangladesh. However, mangoes are climacteric fruits and exhibit limited storage life due to a high respiration rate. Mangoes are also susceptible to particular storage pathogens at postharvest and thus possess a short shelf life. Research Method: Mature mangoes were treated with different concentrations of chitin nanofiber (CNF) and stored in ambient conditions to evaluate the effect of CNF (0.1%, 0.3%, 0.5%) on postharvest quality and shelf life. Disease-free and physiologically mature mangoes were collected from an orchard. The experiment was devised following a Completely Randomized Design with three replications, and each replication consisted of 10 fruits. Fruits were evaluated for physical quality (weight loss, fruit firmness, and color changes), chemical attributes [ changes in total soluble solids (TSS), titratable acidity (TA), vitamin C content], microbial (disease incidence and disease severity), and shelf life. Findings: The application of 0.3% CNF maintains fruit color (6.33 vs. 4), decreases disease incidence (62.5% vs. 100%) and prolongs the shelf life (8.5 days vs. 6.02 days) of mangoes than the control. Similarly, 0.1% of CNF retains vitamin C (24.33 mg/100g vs. 12.33 mg/100g), decreases disease severity (62% vs. 85.68%), and 0.5% of CNF reduces weight loss (19.34% vs. 31.4%) than the control. Research Limitations: CNF preparation requires lab facilities and technical expertise, and it is costly. Originality/Value: CNF 0.3% has the potential to maintain postharvest quality and extend the shelf life of mangoes. However, more research is needed to make the final recommendation at the farmers’ level.
Food Science and Technology
Md. Rahat Khan; Asmaul Husna Nupur; Jannatul Ferdushi Jany; Latifa Jannat; Abdullah Iqbal; Md. Abdul Alim
Abstract
Purpose: The current study examined the impacts of postharvest treatments with different coating solutions to enhance the shelf life of papaya at the least nutrient loss. Research method: The study was carried out with mature and fresh shahi papayas (BARI Papaya-1) using Complete Randomized Design. The ...
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Purpose: The current study examined the impacts of postharvest treatments with different coating solutions to enhance the shelf life of papaya at the least nutrient loss. Research method: The study was carried out with mature and fresh shahi papayas (BARI Papaya-1) using Complete Randomized Design. The experiment comprised four treatments namely control (T1), coating with 2% pectin solution (T2), 2% cellulose acetate solution (T3), and 2% sodium alginate solution (T4). Findings: Significant variations among the treatments regarding physicochemical characteristics like color, weight loss (%), moisture content (%), pH, titratable acidity, total soluble solids (°Brix), vitamin C content, and biological parameters like total viable count (TVC), and shelf life were observed for the 12 day storage periods. It was observed that vitamin C content, moisture content, and titratable acidity gave higher values in the treated samples (T2, T3, T4) with the lowest color score, weight loss, total soluble solids, and pH. Among the samples, the papaya treated with 2% sodium alginate solution obtained the longest shelf life with the lowest TVC value. Conversely, the control papaya had the highest microbial load with the shortest shelf life. Research limitations: There was no limitation. Originality/Value: Among the treatments, 2% sodium alginate solution increased the shelf life of papaya by 16% and decreased post-harvest loss. Therefore, 2% sodium alginate solution treatment seems to be a good substitute for preservation and an effective way to retain the quality of papaya.
Food Science and Technology
Simple Sharma; Barinderjit Singh; Yashi Srivastava
Abstract
Purpose: The aim of this study was to identify the engineering, physiochemical, and nutritional properties of selected varieties of pomelo fruit. Research method: The study was carried out using a one-way analysis of variance with three replications on selected varieties of pomelo fruit. The experiment ...
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Purpose: The aim of this study was to identify the engineering, physiochemical, and nutritional properties of selected varieties of pomelo fruit. Research method: The study was carried out using a one-way analysis of variance with three replications on selected varieties of pomelo fruit. The experiment consisted of three cultivars, namely red, pink, and white pomelo to analyze the engineering, physiochemical, and nutritional properties. Findings: The results revealed that the geometrical and gravimetric analysis showed variation among different parameters of varieties of pomelo fruit. Textural property, such as the puncture resistance test was highest for the pink variety at 20.19 N. The color analysis in the optical parameter showed the highest values for the white variety of pomelo. The identification of functional compounds done by Fourier transform infrared spectroscopy provides advancement for the production of different functional products. The assessment of physicochemical and nutritional properties provides knowledge of nutrients, essential minerals (boron, magnesium, aluminum, silicon, phosphorous, potassium, iron, copper, zinc), and quality of fruit, making it an expert functional food ingredient and can be utilized for various applications in food industries. The physicochemical and nutritional properties indicated significant variation (p<0.05) among different parts of selected varieties of pomelo fruit. Research limitations: There was no limitation. Originality/Value: Pomelo is an underutilized fruit with a rich source of bioactive compounds, has a favorable nutritional profile, and has health-improving effects. With its great nutritive value, utilization of this fruit is still very limited because of a lack of information regarding its physicochemical, nutritional, and processing technologies. This research work on different food properties provides a broad area of knowledge regarding designing, processing, storage, transportation, product development and is useful to encourage commercialization.
Food Science and Technology
Nasiru Alhassan; Adowah Ndomakaah
Abstract
Purpose: Bananas have been experiencing increased production worldwide due to increased cultivated areas over the last three decades. However, postharvest losses of bananas are the major concern due to their highly perishable nature and therefore require appropriate treatments and storage methods to ...
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Purpose: Bananas have been experiencing increased production worldwide due to increased cultivated areas over the last three decades. However, postharvest losses of bananas are the major concern due to their highly perishable nature and therefore require appropriate treatments and storage methods to extend storage life. This study evaluates the effects of Aloe vera coating and storage temperatures on the physiological changes, and sensorial attributes of Lantundan and Cavendish bananas. Research method: These fruits were coated with Aloe vera and stored at 10°C or 25 ± 2°C and relative humidity of 70-75% or 50-55% respectively. The fruits were evaluated every 2 days for 10 days. Findings: Aloe vera treatment reduced weight loss, inhibited peel colour changes, delayed total soluble solids and titratable acidity changes, and minimised decay of the two banana cultivars. Coating did not significantly affect taste and overall acceptability, although panelists preferred coated bananas. The combined effects of Aloe vera coating and storage at 10°C was the most effective treatment in maintaining Lantundan and Cavendish bananas qualities. Research limitations: This study could not measure endogenous ethylene and respiration to ascertain their impact on peel colour changes to a lack of equipment. Originality/Value: It therefore extended the shelf life of the fruits to 10 days, compared with uncoated bananas which had a shorter shelf life of 6 days.
Food Science and Technology
Emmanuel Bwade Kefas; Bashir Aliyu; Yakubu Ibrahim Tashiwa
Abstract
Purpose: Despite the worldwide rise in annual tomato production, approximately 15-50% of harvested tomatoes are lost each year, posing a significant challenge to global food security. This review seeks to assess the efficacy of biochemical treatments in preserving tomatoes to mitigate post-harvest losses. ...
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Purpose: Despite the worldwide rise in annual tomato production, approximately 15-50% of harvested tomatoes are lost each year, posing a significant challenge to global food security. This review seeks to assess the efficacy of biochemical treatments in preserving tomatoes to mitigate post-harvest losses. A machine-based search mapped articles on "Chitosan coating and tomato preservation," "Calcium chloride and tomato preservation," and "Potassium permanganate and tomato preservation" using Google Scholar. Seventy relevant articles published between 1995 and 2024 were included in the systematic literature review. Findings: Calcium chloride, Chitosan coating, and Potassium permanganate exhibit promise in enhancing tomato shelf life, yet their efficacy is contingent upon variables like tomato variety and storage conditions. Achieving a universally effective treatment proves challenging due to variations in study outcomes, highlighting the complexity of preserving tomatoes optimally. Limitations: The variability observed in reported outcomes poses significant challenges when it comes to discerning the most effective and optimal treatment. This inherent inconsistency in results not only complicates the identification of a universally applicable solution but also underscores the intricate nature of the factors influencing treatment effectiveness. Directions for Future Research: Future research should examine treatment combinations, consider responses to tomato cultivars, assess ecological impacts, implement safety protocols, and utilize advanced analytical techniques to refine tomato preservation methods.
Postharvest Biology and Technology
Nair Chithra Harinarayanan; Maya Raman
Abstract
Purpose: The prime aim of food storage and preservation is to protect and preserve food; and hence, extend its shelf life with minimal losses. Amongst the various factors involved to increase the shelf life and preservation, packaging plays a very critical role by providing a good physical barrier to ...
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Purpose: The prime aim of food storage and preservation is to protect and preserve food; and hence, extend its shelf life with minimal losses. Amongst the various factors involved to increase the shelf life and preservation, packaging plays a very critical role by providing a good physical barrier to oxygen, moisture, microorganisms, and other volatiles. Certain perishable food products require modified and controlled atmospheric packaging in order to keep them fresh, sterile, clean, and safe. The purpose of this study is to analyze and understand the use of silicone membrane technology in preserving the quality and extending the shelf life of fruits and vegetables. Main findings: The silicone membrane system (SMS) being a method of controlling atmospheric composition in fruits and vegetable storage, it was found that the shelf life and quality of the products were maintained to its best through selective membrane permeability and product respiration. The SMS allows diffusion of gases, at different rates, which is dependent on its physical and chemical properties and can be technically controlled compared to conventional Controlled Atmospheric systems. Limitations: This technology has been limited only to laboratory scale, and needs to be commercialized. Another big limitation is its high cost. Moreover, certain fruits required pre-processing before being kept in chambers with silicone windows. Directions for Future Research: This system needs to be studied in a more appropriate way and in a more cost-effective manner, such that it can be commercialized and made available for farmers at low cost to protect their produce.
Food Science and Technology
Laleh Mosharraf; Maryam Tatari; Saeed Malek
Abstract
Purpose: The white mulberry tree (Morusalba) having a low water requirement, is native to Iran. Mulberry leaf extract is a rich chlorophyll source, and natural source of antioxidants and coloring pigments. White mulberry leaf extract was studied in terms of color production ability and antioxidant properties. ...
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Purpose: The white mulberry tree (Morusalba) having a low water requirement, is native to Iran. Mulberry leaf extract is a rich chlorophyll source, and natural source of antioxidants and coloring pigments. White mulberry leaf extract was studied in terms of color production ability and antioxidant properties. Research method: The extracts of mulberry leaves were extracted by pure solvents of methanol, acetone, ethanol and 96% and 80% ethanol. Color extraction was investigated at beginning, middle and end of the production season. Antioxidant capacity, phenolic compounds, ferric reducing power and color stability were evaluated. Findings: 80% ethanol had a higher extraction rate and was cost-effective. In April and May, more total chlorophyll and carotenoid were extracted than in June. To determine the optimized antioxidant capacity, 100% ethanol solvent, sample to solvent ratio of 1 to 10, and microwave power of 500-watt were used. The leaves phenolic compounds extracted were highest in April (24.01 μg/ml) and lowest in June (19.13 μg/ml). The ferric reducing power was higher in the first samples of the season. Color stability decreased with pH from 6 to 3 and temperature increasing from laboratory temperature to 90°C and receiving light. Research limitations: The extracted color was not investigated in food products. Originality/Value: Chlorophyll, carotenoids, phenolic compounds and ferric reducing power were higher in the leaves at the beginning of the season. Color extraction from leaves harvested in April with 80% ethanol solvent had a higher value while maintaining pH and storage at room temperature in the dark.
Food Science and Technology
Seyed Jafar Hashemi; Azadeh Ranjbar Nedamani
Abstract
Purpose: Selecting the most effective factors and their combination during food processing, is critical to reduce the energy consumption, the time of process and also maintaining the final product properties. Research method: A definitive screen design of response surface methodology was designed by ...
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Purpose: Selecting the most effective factors and their combination during food processing, is critical to reduce the energy consumption, the time of process and also maintaining the final product properties. Research method: A definitive screen design of response surface methodology was designed by Design Expert software. Factors such as drying time (A: 20-60 ℃), air velocity (B: 0.5-2.5 m/s), sample thickness (C: 3-7 mm), sample diameter (D: 4-6 cm), and drying time (E: 6000-10000s) were investigated. The treatments from response surface methodology were simulated in COMSOL software 5.3a. The simulated data such as moisture content, moisture ratio, central temperature of sample, and total shrinkage were used as surface responses in Design-Expert in order to find the effective process factors on orange drying. Findings: Orange drying simulations show the air temperature and its interaction with other process factors is effective on central temperature of samples. The moisture rate and moisture content depends on sample thickness and drying time, the shrinkage was a linear model as a function of thickness and process time. In orange samples, at thickness of 0.5mm, diameter of 4.8 cm, and drying time of 7379s the least shrinkage will occur according to prediction models. Research limitations: Calculating the experimental shrinkage, moisture ratio, and moisture rate were the research limitation for further simulation. Originality/Value: Combination the response surface methodology and COMSOL simulation in order to reducing the number of studied treatments. Finding the effective factors and their interactions and also the prediction model for final dried orange characteristics. Finding the shrinkage model of orange fruit with respect to the studied drying process factors.
Food Science and Technology
Olusola Michael Obembe; Durojaye Olanrewaju Ojo; Kayode David Ileke
Abstract
Purpose: The leaves of Telfairia occidentalis is affected by the various methods of drying and storage employed after harvest. This research work is therefore designed to determining the best drying method for the preservation of Telfairia occidentalis using the mineral and proximate constituents as ...
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Purpose: The leaves of Telfairia occidentalis is affected by the various methods of drying and storage employed after harvest. This research work is therefore designed to determining the best drying method for the preservation of Telfairia occidentalis using the mineral and proximate constituents as indices. Research method: The cleaned, fresh leaves were then divided into three portions. The first portion was sundried, the second portion was air-dried and the third portion was oven-dried. Each sample was analyzed for proximate composition and mineral content. Findings: The results of the various analysis generally showed that the oven-dried samples have the highest mineral content followed by sun-dried and then the air-dried. The ash content was most top (12.78%) in the oven-dried example, sample followed by air-dried, sun-dried, and then fresh samples while the moisture content was most top (82.62%) in the clean examplefollowed by sun-dried, air-dried and oven-dried with 11.40, 9.18%, and 6.33% moisture respectively. The carbohydrate content was most top (32.62%) in the sun-dried sample followed by air-dried, oven-dried and then fresh ones with 30.10, 29.58, and 4.44% respectively. The protein content was highest (32.69%) in the oven-dried samplefollowed by air-dried, clean, and then sun-dried examples with 30.16, 5.92, and 2.70%, respectively. The fat content was highest (7.50%) in the air-dried and oven-dried examples followed by sun-dried, and the fresh ones with 6.85 and 1.85%, respectively. The fiber content was most top (11.16%) in the oven-dried example followed by air-dried, sun-dried, and the fresh ones with 10.69, 9.16, and 2.94% respectively. Limitations: The proximate and mineral compositions of the leaves were investigated after drying and storage. Originality/Value: The results showed that the oven-dried samples in most cases, have the highest proximate and mineral composition. So, oven-drying is the most nutritionally viable method in the preservation and storage of Telfairia occidentalis.
Food Science and Technology
Igor Hernandez; Begoña Alfaro; Naiara Rodriguez-Ezpeleta
Abstract
Purpose: Spoilage flora is critical in vegetal ready to eat (RTE) product shelf-life and selecting efficient spoilage control technologies depends on the microorganisms present. This manuscript describes the evolution of the bacteriome of Batavia RTE lettuce, from fresh lettuce up to completely spoiled ...
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Purpose: Spoilage flora is critical in vegetal ready to eat (RTE) product shelf-life and selecting efficient spoilage control technologies depends on the microorganisms present. This manuscript describes the evolution of the bacteriome of Batavia RTE lettuce, from fresh lettuce up to completely spoiled (day 14) and correlate these results with the sensorial characteristics. Research Method: The microbiome of vegetal RTE were examined using culture-dependent and culture-independent (16S rRNA metabarcoding) methods. Culture-dependent methods were related with the metagenomic results and sensory analysis to describe the evolution during spoilage and shelf-life. Findings: Our results demonstrated that the RTE lettuce bacteriome during spoilage is dominated by Gram-negative bacteria, mainly Flavobacterium and Pseudomonas. A bacterial population of 22 operational taxonomic units (OTUs) represent up to 96% of total bacterial reads and is maintained during the spoilage, representing the bacterial core of RTE lettuce. A high correlation was detected between culture-independent and culture-dependent results, both in general and selective culture media. Sensorial analysis of lettuce demonstrated that "odor" was the key parameter to determine the sensorial spoilage time and is related to total microbial load and to high concentrations of spoilage-related bacterial genera. Limitations: Hereby presented results are limited by the lettuce variety and by the storage conditions (MAP, 6°C, up to 14 days). Originality/Value: This paper describes an overview of the microbial and sensory evolution during spoilage of Batavia lettuce under MAP. A combination of culture-dependent and independent methods and sensorial analysis were used up to 14 days of storage.
Food Science and Technology
Nulu Nansikombi; John H. Muyonga; Yusuf B. Byaruhanga
Abstract
Purpose: Transformation of pumpkin flesh and seeds into dry flours increases their shelf stability and versatility. This study sought to optimise drying conditions for production of flour with high nutritional and nutraceutical value from flesh and seeds of C. pepo L var. fastigata using Response Surface ...
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Purpose: Transformation of pumpkin flesh and seeds into dry flours increases their shelf stability and versatility. This study sought to optimise drying conditions for production of flour with high nutritional and nutraceutical value from flesh and seeds of C. pepo L var. fastigata using Response Surface Methodology, I optimal design. Research Method: Pumpkin flesh and seeds were dried following temperature time combinations got using I optimal design. All dry samples were tested for ascorbic acid, total carotenoids, total antioxidant capacity and starch digestibility. Seeds were also tested for in vitro protein digestibility, trypsin inhibitor activity, alpha tocopherol, beta tocopherol, and alpha tocotrienol. Findings: The predicted optimum drying conditions for production of C. pepo L var. fastigata flour with maximum nutritional quality and bioactivity were 57°C; 6.9 hours for flesh and 60°C; 3.15 hours for seeds. The most influential model terms were temperature for resistant starch, in vitro protein digestibility, trypsin inhibitor activity, total carotenoids, alpha tocopherol, beta tocopherol and alpha tocotrienol; quadratic term of temperature and time for ascorbic acid; and drying time for total antioxidant activity of the flesh and temperature for antioxidant activity for seeds. Research limitations: Dryer air flow rate was not included as a variable. Originality/Value: Results give, for the first time, an objective basis for choice of the drying conditions C. pepo L var. fastigata flesh and seeds for maximum nutritional and health benefits.
Food Science and Technology
Ha V. H. Nguyen; Duyen H. H. Nguyen
Abstract
Purpose: The aim of this study was to investigate the effects of nano-chitosan and chitosan coating on physico-chemical properties of strawberries during storage. Research methods: Fresh strawberries were coated with different concentrations of chitosan (1%, 1.5%. 2%) or nano-chitosan (0.2%, 0.4%, and ...
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Purpose: The aim of this study was to investigate the effects of nano-chitosan and chitosan coating on physico-chemical properties of strawberries during storage. Research methods: Fresh strawberries were coated with different concentrations of chitosan (1%, 1.5%. 2%) or nano-chitosan (0.2%, 0.4%, and 0.8%) and stored in 20C for 21 days. Findings: Coatingstrawberry with0.2% and 0.4% nano-chitosan preserved the overall quality index of the fruit up to 21 days. The treatments reduced weight loss, retained firmness, titratable acidity and L-ascorbic acid, significantly retarded malondialdehyde production and inhibited polyphenol oxidase activity of the stored fruit. The 0.2% nano-chitosan treatment reserved total soluble solid and total anthocyanin content better than the 0.4% nano-chitosan. Although 2% chitosan coating showed the positive effects, the overall quality index of the coated fruit was reduced below the acceptable level after 18 days, shorter as compared to the others coated with the lower concentrations of nano-chitosan. Research Limitations: Nano-chitosan, showing to be the effective coating material in this study, is not popular traded in the industry. Originality/Value: The combination of 0.2 % nano-chitosan coating and storing fresh strawberry at 2°C preserved the quality of fruits up to 21 days. The much lower concentrations of nano-chitosan showed higher positive effects as compared to the higher concentrations of chitosan. This would help to reduce the cost of postharvest handlings for the strawberry industry.
Food Science and Technology
Jacobs Adesina; Yallappa Rajashaker; Thomas Inomisan Ofuya
Abstract
Purpose: A study was carried out to determine the potentiality of Bridelia micrantha (BM) as biofumigant for the control of some economically important insect pests of stored food grains. Research Method: BM powder was sequentially extracted with a series of solvents of increasing polarity in a Soxhlet ...
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Purpose: A study was carried out to determine the potentiality of Bridelia micrantha (BM) as biofumigant for the control of some economically important insect pests of stored food grains. Research Method: BM powder was sequentially extracted with a series of solvents of increasing polarity in a Soxhlet apparatus and concentrated by the rotatory evaporator. The residues were dissolved in 50ml methanol, assayed for insecticidal activity by fumigant toxicity. Effective and active extract which showed maximum activity was selected for analysis using Gas Chromatography-Mass Spectrometry (GC-MS). Findings: Ethyl acetate crude extract and its active fraction (50% hexane: 50% ethyl acetate) showed more potent insecticidal activity with increasing concentration and exposure time. Among the insect species Tribolium castaneum is more susceptible and Rhyzoperthadominica tolerant of the fumigant toxicity treatments. GC-MS analysis revealed that Dibutyl phthalate (96%), 3-Dodecen-1-al (87%), 13-docosen-1-ol (83%) Ethanol-2-(2-butoxyethoxy) (80%), 2-Butenoic acid, 2 propentl (47%), 4-Hydroxyphenylacetic acid (38%) and Phenyl salicylate (30%) were the major constituents out of the eleven bioactive compounds identified. Research limitations: There were no limitations to report. Originality/Value: The results suggested that B. micrantha may be utilized as a good potential herbal fumigant for the management of stored product-insect pests due to its potent insecticidal activity and chemical composition which contains many different chemicals that have different modes of action on target pests and effective in the conservation of the germinative power of the various food grains.
Food Science and Technology
Munir Abba Dandago; Daniel T. Gungula; Hycenth Nahunnaro
Abstract
Purpose: Tomato postharvest losses are as high as 60% in Nigeria despite being 13th producer. This could be reduced when tomatoes were carefully treated and packaged. This research investigated the effects of chemical dips and packaging on storability of tomatoes. Research method: The research was a ...
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Purpose: Tomato postharvest losses are as high as 60% in Nigeria despite being 13th producer. This could be reduced when tomatoes were carefully treated and packaged. This research investigated the effects of chemical dips and packaging on storability of tomatoes. Research method: The research was a factorial design laid out in RCBD with three replications. The field work was done in Kura while the laboratory was done at Kano University of Science and Technology. Tomatoes were harvested, sorted, weighed into 3 kg lots and treated (D1= dip in water, D2= dip in 200 ppm NaOCl and 1% CaCl2 for 5 minutes and D3= dip in 200 ppm NaOCl and 3% C6H7KO2 for 5 and 1 minutes respectively) and packaged as follows: (P1= kraft paper, P2= perforated polyethylene and P3= sealed polyethylene). Analyses of firmness, % weight loss, % rot, ascorbic acid and lycopene were carried out every 3 days. Data collected were analyzed using GLM procedure (SAS) and means separated using LSD. Main findings: Results showed fruits dipped in 200 ppm NaOCl and CaCl2 for 5 minutes; packaged in perforated PE; and fruits dipped in 200 ppm NaOCl and CaCl2 for 5 minutes and packaged in sealed polyethylene were the best combinations. The treatments maintained physico-chemical parameters of tomatoes within acceptable limit for 24 days. Limitations: Firmness measurement was a challenge of the study. Originality/Value: A combination of the two factors is novel in the study environment and this could help in reducing the postharvest losses thereby improving farmers’ income.
Food Science and Technology
Nasir Haqbeen; Vidya Sagar; Shalini Rudra; K. Prasad
Abstract
Purpose: Pineapple fruit is a rich source of minerals and vitamins. Its shelf life is very short due to perishability characteristic. Research Method: In this research, the effect of pre-treatments on pineapple slices for its preservation and acceptability was studied. The pineapple slices were treated ...
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Purpose: Pineapple fruit is a rich source of minerals and vitamins. Its shelf life is very short due to perishability characteristic. Research Method: In this research, the effect of pre-treatments on pineapple slices for its preservation and acceptability was studied. The pineapple slices were treated with three different osmotic (table sugar) solution concentrations, temperature, and vacuum pressure levels to find the most suitable treatment in term of quality. Different parameters such as weight reduction, water loss, solid gain, nutritional quality and sensory test (texture, taste, odor, and appearance) were studied. To perform these parameters pineapple slices were immersed in sugar solution on 50, 60 ºB (degree Brix) at 30, 40 and 50 ºC followed by three vacuum pressures including 435 mmHg, 110 mmHg and atmospheric 760 mmHg pressures for up to 180 min. Findings: Results showed that water loss in pineapple slices increased with increase in vacuum level in all three sugar concentrations and degrees of temperatures in osmotic solution. Weight reduction, water loss, solid gain, water activity, total color, ascorbic acid content, whereas sugar content was found significantly affecting the process followed by temperature and levels of vacuum. Research limitations: There were no limitations to report. Originality/Value: It was found that the most affecting treatment was vacuum pressure, whereas the highest changes occurred in appearance followed by the ascorbic acid content of the samples treated with different parameters.
Food Science and Technology
Philippa Ojimelukwe
Abstract
Purpose: The aim of this study was to investigate the effects of ambient temperature storage condition (27-29°C) and domestic cooking on contents of carotenoids, chlorophylls, vitamins and minerals in the leaves of Gnetum africanum. Research method: Carotenoids were separated and analyzed by ...
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Purpose: The aim of this study was to investigate the effects of ambient temperature storage condition (27-29°C) and domestic cooking on contents of carotenoids, chlorophylls, vitamins and minerals in the leaves of Gnetum africanum. Research method: Carotenoids were separated and analyzed by HPLC. Total-carotene content, vitamins and minerals were assessed spectrophotometrically. Main findings: Results indicated that G. africanumwas rich in lutein (528.87 µg g-1 (dry weight basis) and total β-carotene (248.10 µg g-1). There was no statistical increase in total β-carotene content due to cooking, but there was a decrease due to storage. Total β-carotene isomerized more during thermal processing than in storage. Cooking decreased (p>0.05) the contents of chlorophylls, water soluble vitamins and minerals. Cooking and storage of G. africanum resulted in significant losses in ascorbic acid, riboflavin and niacin. Cooking also reduced the potassium, calcium, magnesium and zinc. Iron contents of cooked and stored samples were higher than that of the raw sample. Research limitations: We had to travel over 600 km to use facilities for carotenoid analysis. Originality/value: The concentrations of lutein, β-carotene and certain micronutrients in G. africanumare much higher than typical contents in conventional edible leafy vegetables. The results of this study therefore provide evidence that G. africanum leaf could be an important contributor for improving the nutritional status of rural and urban people.
Food Science and Technology
Mehdi Khayyat; Hashem Amini; Saeed Moodi; Farid Moradinezhad; Sohrab Mahmoodi
Abstract
Silverberry fruit is an important medicinal fruit that used for reducing pain. The present work was carried out to study the effect of potassium meta-bisulfite (KMS) and air drying temperature on quality of Russian olive fruit. Different KMS levels (0, 1, 2 and 4%) and drying temperatures (45, 60 and ...
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Silverberry fruit is an important medicinal fruit that used for reducing pain. The present work was carried out to study the effect of potassium meta-bisulfite (KMS) and air drying temperature on quality of Russian olive fruit. Different KMS levels (0, 1, 2 and 4%) and drying temperatures (45, 60 and 75°C) were used and some traits such as weight loss (WL), rehydration ratio (RH-R), TSS (total soluble solids), TA (total acidity), TSS/TA ratio, ascorbic acid, color parameters (L*, a*, b*, chroma and Hue, TEPL, TEPa and TEPb, ΔE and BI), total phenol (TP), and potassium were measured. WL, RH-R and total color change (ΔE) increased with increment of pre-treatment concentration. All traits except TSS, were significantly affected by drying temperature. TA, ascorbic acid and TP raised by increasing air temperature from 45°C to 60°C. Temperature higher than 60°C increased ΔE. Increment of temperature from 45°C to 75°C led to an increasing trend of browning index, a*, b* and C* (chroma), however, L* (lightness) and hue angle decreased. In general, using higher KMS concentrations as pre-treatment improved weight loss during drying, however, significant color change observed and color retention significantly reduced. Drying temperature higher than 60°C also increased browning index of Russian olive fruit, however, total phenols increased in parallel. Thus, it is suggested that drying temperatures lower than 60°C may be good treatment for drying silverberry fruits.
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