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KMID : 1007520150240062161
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Food Science and Biotechnology
2015 Volume.24 No. 6 p.2161 ~ p.2167
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Distribution of Phytic Acid and Associated Catabolic Enzymes in Soybean Sprouts and Indoleacetic Acid Promotion of Zn, Fe, and Ca Bioavailability
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Wang Xinkun
Yang Runqiang
Jin Xiaolin
Zhou Yulin
Han Yong-Bin
Gu Zhenxin
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Abstract
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Phytic acid is involved in storage of phosphorus and minerals in soybeans. The effects of 6 basic plant hormones on phytic acid degradation were investigated. After 6 days of germination, phytic acid contents in soybean sprouts decreased by 70%, compared with day 0 soybeans. Zn and Fe bioavailability of 6-day-old germinating soybean both significantly increased (p<0.05), by contrast, Ca bioavailability decreased compared with controls. Phytic acid was detectable only in cotyledons of soybean sprouts during germination. In germinating soybeans, 39.19-45.85% and 54.15-60.81% of phytase existed in embryos and cotyledons, respectively. Unlike phytase, acid phosphatase was present mainly in cotyledons (92.57-97.51%). Among the 6 hormones, 50 mg/L indoleacetic acid (IAA) brought the highest degradation value to phytic acid content, meanwhile, Zn, Fe, and Ca bioavailability of IAA-treated soybeans were significantly (p<0.05) improved, compared with that of the control, respectively.
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KEYWORD
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soybean sprout, phytic acid, catabolic enzyme, indoleacetic acid
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