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Increase of gamma-aminobutyric acid contents in rice embryo with protein hydrolysates and pyridoxal-5-phosphate using abiotic stress

Authors
Oh, Su-JinKim, Hyun SooLim, Seung-Taik
Issue Date
9월-2019
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Keywords
Rice embryo; Gamma-aminobutyric acid; Abiotic stress; Protein hydrolysate
Citation
JOURNAL OF CEREAL SCIENCE, v.89
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF CEREAL SCIENCE
Volume
89
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/63035
DOI
10.1016/j.jcs.2019.102803
ISSN
0733-5210
Abstract
Effects of abiotic stress treatment and the addition of protein hydrolysates and pyridoxal-5-phosphate on the gamma-aminobutyric acid (GABA) accumulation in rice embryo were investigated. After adjusting the moisture content to 20% by adding an electrolyzed oxidizing water and storing anaerobically at 40 degrees C for 8 h, the rice embryo showed a significant increase in the residual GABA content from 79.8 to 269.9 mg/100 g. The GABA content in rice embryo could be further raised by adding protein hydrolysates: 503.4 and 406.4 mg/100 g, respectively with 4% wheat protein hydrolysate (WPH) and 8% yeast extract (YE). A minor addition of PLP (1.5 mg/100 g embryo solids) increased the GABA content to 827.6 and 725.3 mg/100 g, for the samples containing 4% WPH or 8% YE, respectively. Additionally, total amount of essential amino acids in rice embryo was significantly increased by the addition of protein hydrolysates and the abiotic stress treatment.
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