Use of kitchen steel wool as oxygen absorber improves storage retention of beta-carotene in solar-dried vegetables

Nyambaka, Hudson; Nderitu, James; Nawiri, Mildred; Murungi, Jane

doi:10.13171/mjc.1.6.2012.26.07.21

Cited by 4 publications

(16 citation statements)

References 17 publications

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“…Fresh samples that were not analyzed on the same day were kept frozen until use. The vegetables were solar dried using an indirect solar dryer [5]. The model is shown in plate 1.…”

Section: Food Sample Pre-treatmentmentioning

confidence: 99%

“…It took 6 to 8 hours when the temperature ranged from 25ºC to 27ºC for the vegetables to dry. The solar dried samples were stored in polythene bags, nitrogen flashed and then sealed tightly to prevent any oxygen getting in [5].…”

Section: Food Sample Pre-treatmentmentioning

confidence: 99%

“…The moisture content ranged from 73.50 to 96.14 % for the fresh vegetables. The moisture content of most fresh tissue foods like vegetables and fruits is usually very high above 70% which makes them very susceptible to microbial spoilage and hence limiting their storage stability [5]. The moisture content for the dry vegetable sampled ranged from 5.18% to 6.4%.…”

Section: Moisture Content In Some Selected Vegetables and Fruitsmentioning

confidence: 99%

“…For many urban households however, a good proportion of vegetables consumed are purchased from markets. Some common indigenous vegetables include: spider weed, amaranth, pigweed, black nightshade, pumpkin leaves, cowpeas and black jack, as well as the less common sun hemp, jute plant, stinging nettle, African eggplant and okra [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The nutritive value of greens remains underutilized due to lack of awareness and promotion of appropriate technologies for their effective utilization. Green leafy vegetables are a very good source of minerals and vitamins and when consumed regularly they can substantially improve micronutrient status of the Kenyan population [5,6]. Several of these are used for medicinal purposes [1].…”

Section: Introductionmentioning

confidence: 99%

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Determination of β-carotene and α-tocopherol Content in Selected Fresh and Dry Vegetables in Butula in Busia County

Nambafu

Swaleh

Nyambaka

2021

AIR

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The study involved the determination of β-carotene and α-tocopherol content in selected fresh and dry vegetables (amaranthus, cowpea leaves, nightshade, slender leaf, pumpkin leaves and frying spider) using High Performance Liquid Chromatography (HPLC) procedure. Fresh blanched vegetables contained high levels of β-carotene; 4000-9700µg/100g and α-tocopherol levels; 3000-7360µg/100g (WW). The solar dried vegetables contained β- carotene levels ranging from 572 to 854µg g-1 dry weight (DW) and α-tocopherol levels ranging from 281 to 673µg g-1 (DW). Solar dried vegetables contained significantly lower (P<0.05) amounts of β-carotene and α-tocopherol which were moderately bioavailable when mixed in good proportion to meet Recommended Dietary Allowance (RDA) of vitamins A and E; which are 750µg retinol equivalent/day and 8mg/day respectively. The results will provide nutritional information on the indigenous vegetables grown in Butula in Busia County.

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“…Fresh samples that were not analyzed on the same day were kept frozen until use. The vegetables were solar dried using an indirect solar dryer [5]. The model is shown in plate 1.…”

Section: Food Sample Pre-treatmentmentioning

confidence: 99%

Section: Food Sample Pre-treatmentmentioning

confidence: 99%

Section: Moisture Content In Some Selected Vegetables and Fruitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of β-carotene and α-tocopherol Content in Selected Fresh and Dry Vegetables in Butula in Busia County

Nambafu

Swaleh

Nyambaka

2021

AIR

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African nightshades (Solanum nigrum complex): The potential contribution to human nutrition and livelihoods in sub‐Saharan Africa

Sangija

Martin

Matemu

2021

Comp Rev Food Sci Food Safe

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Achieving zero hunger in sub‐Saharan Africa (SSA) without minimizing postharvest losses of agricultural products is impossible. Therefore, a holistic approach is vital to end hunger, simultaneously improving food security, diversity, and livelihoods. This review focuses on the African nightshades (ANS) Solanum spp. contribution to improving food and nutrition security in SSA. Different parts of ANS are utilized as food and medicine; however, pests and diseases hinder ANS utilization. African nightshade is rich in micronutrients such as β‐carotene, vitamins C and E, minerals (iron, calcium, and zinc), and dietary fiber. The leaves contain a high amount of nutrients than the berries. Proper utilization of ANS can contribute to ending hidden hunger, mainly in children and pregnant women. Literature shows that ANS contains antinutritional factors such as oxalate, phytate, nitrate, and alkaloids; however, their quantities are low to cause potential health effects. Several improved varieties with high yields, rich in nutrients, and low alkaloids have been developed in SSA. Various processing and preservation techniques such as cooking, drying, and fermentation are feasible techniques for value addition on ANS in SSA; moreover, most societies are yet to adopt them effectively. Furthermore, promoting value addition and commercialization of ANS is of importance and can create more jobs. Therefore, this review provides an overview of ANS production and challenges that hinder their utilization, possible solutions, and future research suggestions. This review concludes that ANS is an essential nutritious leafy vegetable for improving nutrition and livelihoods in SSA.

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Influence of Ultrasound Parameters on Some Qualities of Frozen African Spinach

Fadeyibi,

Gana,

Ajiboye

2023

FWIAFE

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Consumption of fresh and healthy vegetables in our diets aids protection from chronic diseases in humans. This study determined the effects of ultrasound as a pre-treatment technique on vitamin C, beta-carotene contents, and the weight loss of frozen African spinach (Amaranthus hybridus), and thereafter compared with the control. All the samples except the control were subjected to the ultrasound effects before freezing at frequency, time, and power ranges of 40-120 kHz, 10-30 min, and 50-150 W respectively. Result obtained indicated that the maximum vitamin C (99.5%) was obtained from the sample stored for 5 days under the treatment condition of 40 kHz, 50 W, and 20 min. However, the same sample retained more vitamin C within 5-20 days’ storage, while the pre-treated sample at 80 kHz, 100 W, and 10 min retained the maximum (80.9%) at 25 days of storage. The sample under the treatment condition of 80 kHz, 100 W, and 20 min lost more vitamin C (67.6, 66.6, and 59.2%) between 15-25 storage days. While for the beta-carotene, the sample with the treatment condition of 40 kHz, 50 W, and 20 min before freezing had the highest retention (99.8%) when stored for 5 days, and the same sample retained more at 10, and 15 days than others (97.6, and 92.4%). All pre-treated samples retained more beta-carotene at 25 days of storage when compared to the control with the least retention between 15-25 days. Furthermore, the least obtained content from the pre-treated samples was 64.9%, that is, a sample treated at 80 kHz, 100 W, and 20 min. The result revealed that Amaranthus hybridus was best preserved in pre-treated Amaranthus hybridus leaves. The optimum quality response occurs at 80kHz and 50 W for 30 min. This gives a vitamin C content of 31.1 mg/100g and a Betacarotene content of 10.5 mg/g at 0.694 desirability.

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Use of kitchen steel wool as oxygen absorber improves storage retention of beta-carotene in solar-dried vegetables

Cited by 4 publications

References 17 publications

Determination of β-carotene and α-tocopherol Content in Selected Fresh and Dry Vegetables in Butula in Busia County

Determination of β-carotene and α-tocopherol Content in Selected Fresh and Dry Vegetables in Butula in Busia County

African nightshades (Solanum nigrum complex): The potential contribution to human nutrition and livelihoods in sub‐Saharan Africa

Influence of Ultrasound Parameters on Some Qualities of Frozen African Spinach

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