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Chemical composition, angiotensin‐converting enzyme‐inhibitory activity and antioxidant activities of few‐flower wild rice ( Zizania latifolia Turcz.)
Author(s) -
Qian Bingjun,
Luo Yali,
Deng Yun,
Cao Linkui,
Yang Hongshun,
Shen Yongpei,
Ping Jian
Publication year - 2011
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.4557
Subject(s) - dpph , chemistry , antioxidant , food science , ascorbic acid , composition (language) , nutraceutical , pectin , botany , biochemistry , biology , linguistics , philosophy
BACKGROUND: The chemical compositions of the stem and leaf sheath of few‐flower wild rice were analysed. In addition, their extracts were evaluated for diphenylpicrylhydrazyl (DPPH) free radical‐scavenging activity, ferric‐reducing antioxidant power and angiotensin‐converting enzyme (ACE)‐inhibitory activity, since these are important properties of sources of nutraceuticals or functional foods. RESULTS: The stems contained more ascorbic acid (0.06 g kg −1 fresh weight), protein (28.18 g kg −1 dry weight (DW)), reducing sugars (308.54 g kg −1 DW), water‐soluble pectin (20.63 g kg −1 DW), Na 2 CO 3 ‐soluble pectin (44.14 g kg −1 DW), K (8 g kg −1 dry matter (DM), S (6 g kg −1 DM) and P (5 g kg −1 DM) but less starch, total dietary fibre, Si, Na and Ca than the leaf sheaths. The DPPH free radical‐scavenging IC 50 values of the stem and leaf sheath extracts were 19.28 and 21.22 mg mL −1 respectively. In addition, the ACE‐inhibitory IC 50 value of the stem extracts was 38.54 mg mL −1 . CONCLUSION: Both the stem and leaf sheath extracts exhibited good antioxidant properties, while good ACE‐inhibitory activity was detected only in the phosphate buffer solution extracts of the stem. Few‐flower wild rice could be processed into formula feeds for fish, poultry, etc. or functional foods for persons with high blood pressure. Copyright © 2011 Society of Chemical Industry