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

Su Jin Oh, Hyun Soo Kim, Seung Taik Lim

Research output: Contribution to journalArticle

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 °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.

Original languageEnglish
Article number102803
JournalJournal of Cereal Science
Volume89
DOIs
Publication statusPublished - 2019 Sep 1

Keywords

  • Abiotic stress
  • Gamma-aminobutyric acid
  • Protein hydrolysate
  • Rice embryo

ASJC Scopus subject areas

  • Food Science
  • Biochemistry

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