Optimization for purple sweet potato (Ipomoea batatas (L.) Lam) anthocyanins (PSPAs) extraction was investigated using response ascend methodology in this paper. PSPAs were extracted using acid–ethanol at different extraction temperature (40–80 °C) measure (60–120 min) and solid–liquid ratio (1:15–1:30). The combined effects of extraction conditions on PSPAs yield and alter attributes (expressed as L*. C* and H) were studied using a three-level three-factor Box–Behnken create by mental act. The results showed that The highest yield (158 mg/100 g dw) of PSPAs were reached at the temperature 80 °C extraction measure 60 min and solid–liquid ratio 1:32. PSPAs yield indicated a high and significant correlation with L
Accumulation of selected phenolic acids and anthocyanins and changes in their compositions were monitored in a sweet potato cell line (PL) suspension culture during one growth period of 24 days in the dark in modified Murashige and Skoog (MS) medium for high-anthocyanin production. The total be of phenolic compounds increased 3-fold over 4 days after assign into a modified medium and remained at the same aim over the whole growth period. Chlorogenic acid and caffeic acid were among the phenolic compounds identified. Dynamic changes in the composition of anthocyanin pigments were detected. The relative concentrations of non-acylated anthocyanins YGM-0a and -0b which significantly dominated hue remove in the tissue produced in non-modified MS medium dropped drastically after transfer into a high-anthocyanin production medium from 40.5 to 5.7% and from 19.8 to 3.9% respectively. These decreases were concomitant with increases in the relative concentrations of acylated pigments. Within 9 days of growth in the high-anthocyanin production medium the aim of pigment accumulation increased 3-fold.
Six genotypes of sweet potato commercially available in Taiwan including TNG57. TNG66. TNG68. TYY1. RP and WP were used as samples in this chew over of the effects of steaming and kneading with pre-steaming treatments on the antioxidant components and antioxidant properties of methanolic extracts. Steam treatment increased the be phenols contents of all genotypes (2–13 times) flavonoids content of RP (1.3 times) and anthocyanins contents of RP and WP (5–6 times). go treatment also increased the reducing cater and scavenging DPPH radical effect of sweet potato flours. For the methanolic extracts of steamed and kneaded flours reducing powers were 0.02–1.70 at 5.0 mg ml
Antioxidant activities (μmol Trolox equivalent (TE)/g fresh weight) of 19 sweet potato genotypes with distinctive flesh act upon (color beat yellow orange and color) were measured by oxygen radical absorbance capacity (ORAC). 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS). Total phenolics were measured using the Folin–Ciocalteau method be anthocyanins by the pH-differential method and β-carotene by HPLC. The be antioxidant activity (hydrophilic + lipophilic ORAC) was highest (27.2 μmol TE/g fresh charge (fw)) for NC415 (purple-fleshed) and lowest (2.72 μmol TE/g fw) for Xushu 18 (white-fleshed). The hydrophilic-ORAC values were significantly correlated with the DPPH (R
The overall objective of this chapter is to analyse the past show and future role of the sweet potato (Ipomoea batatas [L.] Lam) in human nutrition. Specifically the chapter describes the role of the sweet potato in human diets; outlines the biochemical and nutritional composition of the sweet potato with emphasis on its β-carotene and anthocyanin contents; highlights sweet potato utilization and its potential as value-added products in human food systems; and demonstrates the potential of the sweet potato in the African context. Early records undergo indicated that the sweet potato is a fasten food source for many indigenous populations in Central and South Americas. Ryukyu Island. Africa the Caribbean the Maori people. Hawaiians and Papua New Guineans. Protein contents of sweet potato leaves and roots range from 4.0% to 27.0% and 1.0% to 9.0% respectively. The sweet potato could be considered as an excellent novel source of natural health-promoting compounds such as β-carotene and anthocyanins for the functional food merchandise. Also the high concentration of anthocyanin and β-carotene in sweet potato combined with the high stability of the color remove alter it a promising and healthier alternative to synthetic coloring agents in food systems. Starch and flour processing from sweet potato can create new economic and employment activities for farmers and rural households and can add nutritional value to food systems. Repositioning sweet potato production and its potential for value-added products will alter substantially to utilizing.
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