Potential use of byproducts from cultivation and processing of sweet potatoes

Akoetey, Winifred; Britain, Margaret Mead; Morawicki, Rubén O.

doi:10.1590/0103-8478cr20160610

Cited by 33 publications

(22 citation statements)

References 42 publications

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“…In this study, peeling of storage roots generally resulted in -carotene loss averaging 28.7, 46.7 and 39.1% at 4, 5 and 7 MAP, respectively inferring that sweet potato peels contain substantial amounts of -carotene. This observation concurs with findings by Akoetey et al (2017) * * * * * * * * * * * * * * * * * * * * * * * * * * * Sample type S) * * * MAP (T) * * * * * * * * * S × T * * * C × T * * * * * * * * * C × S * * * C × T × S * * * CV%= Coefficient of variation; LSD= least significance difference, ***= Significant at p ≤0.01.…”

Section: Effect Of Genotype and Flesh Colour On -Carotene Contentsupporting

confidence: 94%

Analysis of micronutrients variations among sweet potato (Ipomoea batatas [L.] Lam) genotypes in Malawi

Chipungu¹,

Changadeya²,

Ambali³

et al. 2017

J. Agric. Biotech. Sustain. Dev.

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Sweet potato (Ipomoea batatas [L.] Lam) is an important root crop in Malawi and Sub-Saharan Africawhere micronutrient deficiency is an eminent health problem. Using 15 sweet potato genotypes grown in a randomized complete block design at Bvumbwe Research Station, a study was undertaken to determine the extent of variability of selected micronutrients in the genotypes as influenced by storage root age and peeling. Analysis of variance (ANOVA) showed significant (p≤ 0.01) variability among genotypes for dry mater, β-carotene, ascorbic acid levels and reduction of β-carotene due to peeling across all ages. Significant (p ≤ 0.05) variations in zinc, iron and copper were also observed among all genotypes. Peeling reduced β-carotene, ascorbic acid levels, iron, zinc and copper content while late harvesting resulted in low iron, zinc and copper. Therefore, 5 months after planting (MAP) and 4 MAP are recommended for high levels of β-carotene and ascorbic acid and iron, zinc and copper, respectively. Ten genotypes exhibited acceptable levels of dry mater of ≥30%. Zondeni (10.9 mg/100 g, WW) and Babache (23.84 mg/100 g, WW) had highest levels of β-carotene and ascorbic acid, respectively. Mzungu displayed the highest levels of Iron (0.67 mg/100 g, DW) and zinc (0.63 mg/100 g, DW) while Yoyera (0.61 mg/100 g, DW) had the highest levels of copper. Variations of various traits entail potential to breed for higher levels of micronutrients.Key words: Sweet potato, genotypes, β-carotene, ascorbic acid, iron, zinc, copper, peeling, storage root age. INTRODUCTIONApproximately one billion (795 million) people from developing countries suffer from hunger, malnutrition and poverty (FAO, 2015). Various reasons including climate change, environmental degradation, dwindling of natural resources and an ever increasing population have been implicated. In 2015, global population was estimated at 7.3 billion and was expected to climb up to about 9.7 billion in 2050 when nearly 90% of the population will be in resource poor developing countries of Asia, Africa and Latin America (James, 2015). The UN population projection shows that the trend will continue until the end of this century when the global population will reach 10.8 billion or more (UN DESA, 2015). Such increases in global population will result in ever increasing number of food in-secure people, who by definition are people with no physical and economic access to enough safe and nutritious food which meets their dietary needs at all times (FAO, 1996). However, over 3 billion people suffer from a different, sneakier form of hunger than the simple lack of sufficient quantities of foodstuffs referred to as micronutrient malnutrition or "hidden hunger" which is caused by a lack of food of sufficient dietary quality (Kennedy et al., 2003; FAO, 2013). Monotonous diets which are a hallmark of Sub-Saharan countries, based on cereals and other starchy staple foods frequently fail to deliver sufficient quantities of essential minerals and vitamins like Iodine, Iron, Zinc and Vitamin A (D...

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Section: Effect Of Genotype and Flesh Colour On -Carotene Contentsupporting

confidence: 94%

Analysis of micronutrients variations among sweet potato (Ipomoea batatas [L.] Lam) genotypes in Malawi

Chipungu¹,

Changadeya²,

Ambali³

et al. 2017

J. Agric. Biotech. Sustain. Dev.

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“…However, sweet potato peels are considered major wastes generated during the processing of sweet potato with currently little commercial value. Sweet potato peels contain various classes of polyphenols and carotenoids with different health-promoting properties, which makes them suitable for processing into value-added ingredients in functional foods ( 2 ).…”

Section: Introductionmentioning

confidence: 99%

Encapsulation and Degradation Kinetics of Bioactive Compounds from Sweet Potato Peel During Storage

Šeregelj

Ćetković

Čanadanović-Brunet

et al. 2020

Food Technol. Biotechnol. (Online)

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Research background: The aim of this work was to evaluate utilization of sweet potato peel as a source of bioactive compounds. The effect of solvents (acetone and acetone/ethanol mixture) on extraction efficiency of total carotenods and phenolics from sweet potato flesh tuber and peel, and antioxidant activity were investigated. SPP extract standed out in terms of antioxidant activity and was choosen for encapsulation by spray and freeze drying techniques. Experimental approach: Encapsulation is an effective method to improve phytochemical stability by entrapping the core material with a coating agent. In this study, spray and freeze-drying techniques were applied for improving the stability of bioactive compounds (carotenoids and phenolics) using whey protein as a coating material. The main advantages of applied techniques over the other encapsulation techniques are simplicity, continuity, effectiveness, availability, and applicability. Results and conclusions: Physicochemical characteristics revealed that spray drying resulted in the formation of lower size particles, better flowing properties, and encapsulation efficiency of carotenoids. The retention of encapsulated and non-encapsulated bioactive compounds was monitoring during storage at daylight and dark conditions. Storage conditions affected the carotenoid retention, whereas daylight exhibited the higher degradation rate for all samples. Phenolic compounds exhibited higher retention for all investigated samples. Degradation kinetic parameters suggest the longer shelf life of spray dried encapsulates and potent method for bioactives stabilization. Novelty and scientific contribution: This study demonstrates that the spray drying technique and utilization of sweet potato peel have big potential in functional additives development, with improved nutritional, color and bioactive properties.

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“…Sweetpotato leaves have been investigated as a source of natural food colourants (Hue et al ., 2014). Anthocyanins, lutein, β -carotene and other carotenoids can be extracted from sweetpotatoes (Akoetey et al ., 2017). Lutein potentially could replace the artificial food colourant tartrazine (FD&C Yellow 5) (Hue et al ., 2014; Akoetey et al ., 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Anthocyanins, lutein, β -carotene and other carotenoids can be extracted from sweetpotatoes (Akoetey et al ., 2017). Lutein potentially could replace the artificial food colourant tartrazine (FD&C Yellow 5) (Hue et al ., 2014; Akoetey et al ., 2017). Anthocyanins are relatively unstable compounds and must be handled carefully to retain their colour (de Pascual-Teresa and Sanchez-Ballesta, 2008).…”

Section: Discussionmentioning

confidence: 99%

Phenotypic analysis of leaf colours from the USDA, ARS sweetpotato (Ipomoea batatas) germplasm collection

Jackson

Harrison

Jarret

et al. 2019

Plant Genet. Resour.

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Leaf colour characteristics of 730 sweetpotato, Ipomoea batatas (L.) Lam. (Convolvulaceae), plant introduction (PI) accessions from the USDA sweetpotato germplasm collection were evaluated during 2012–2014. Colorimetry data for the abaxial and adaxial leaf surfaces were recorded using a tristimulus colorimeter and the CIE 1976 L*a*b* and CIE L*C*h* colour spaces. Most accessions (725 of 730 PIs) had dark-to-medium green leaves, but two PIs had totally purple leaves, and three PIs had yellow or yellow-green (chartreuse) leaves. For mature, field-grown green leaves, values for the red-green coordinate (a*) averaged −12.4 for the adaxial and −10.4 for the abaxial leaf surface. Values for the blue-yellow coordinate (b*) averaged 17.2 for the adaxial and 17.3 for the abaxial leaf surface. Hue angle (h*) for green leaves averaged 120.9° for the adaxial and 126.2° for the abaxial leaf surface. Colour saturation (Chroma, C*) averaged 21.3 for the adaxial and 20.2 for the abaxial leaf surface. Lightness (L*) averaged 35.4 for the adaxial and 47.2 for the abaxial leaf surface of green leaves. Late in the season, over one-half (53.9%) of the 730 PIs showed some level of purple pigmentation in the leaf lamina. Late-season purple leaves were collected and colour coordinates were recorded for 118 PIs grown in the field. For purple leaves, values for a*, b*, C*, L* and h* averaged 2.3, 6.2, 7.9, 28.2 and 64.4° for the adaxial surface and −1.0, 12.7, 13.9, 43.1 and 87.0° for the abaxial leaf surface, respectively.

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Potential use of byproducts from cultivation and processing of sweet potatoes

Cited by 33 publications

References 42 publications

Analysis of micronutrients variations among sweet potato (Ipomoea batatas [L.] Lam) genotypes in Malawi

Analysis of micronutrients variations among sweet potato (Ipomoea batatas [L.] Lam) genotypes in Malawi

Encapsulation and Degradation Kinetics of Bioactive Compounds from Sweet Potato Peel During Storage

Phenotypic analysis of leaf colours from the USDA, ARS sweetpotato (Ipomoea batatas) germplasm collection

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