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Antioxidant activities, phenolic and β-carotene contents of sweet potato genotypes with varying flesh colours

Permanent URL:
http://handle.nal.usda.gov/10113/16231
Abstract:
Antioxidant activities (micromol Trolox equivalent (TE)/g fresh weight) of 19 sweet potato genotypes with distinctive flesh colour (white, cream, yellow, orange and purple) 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, total anthocyanins by the pH-differential method, and β-carotene by HPLC. The total antioxidant activity (hydrophilic + lipophilic ORAC) was highest (27.2 micromol TE/g fresh weight (fw)) for NC415 (purple-fleshed) and lowest (2.72 micromol TE/g fw) for Xushu 18 (white-fleshed). The hydrophilic-ORAC values were significantly correlated with the DPPH (R² = 0.859) and ABTS (R² = 0.761) values. However, the lipophilic-ORAC values were poorly correlated with the β-carotene contents (R² = 0.480). The total phenolic contents (0.011-0.949 mg chlorogenic acid equivalent/g fw) were highly correlated with the hydrophilic-ORAC (R² = 0.937) and DPPH (R² = 0.820) values. Therefore, the total phenolic content can serve as a useful indicator for the antioxidant activities of sweet potatoes.
Author(s):
Teow, C.C. , Truong, V. , McFeeters, R.F. , Thompson, R.L. , Pecota, K.V. , Yencho, G.C.
Subject(s):
antioxidant activity , phenolic compounds , beta-carotene , antioxidants , sweet potatoes , food composition , genotype , color , epidermis (plant) , Ipomoea batatas
Format:
p. 829-838.
Note:
Includes references
Source:
Food chemistry 2007, v. 103, issue 3
Language:
English
Year:
2007
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.