Effect of an Environment Friendly Heat and Relative Humidity Approach on gamma-Aminobutyric Acid Accumulation in Different Highland Barley Cultivars

文献类型： 外文期刊

第一作者： Wang, Shanshan

作者： Wang, Shanshan;Wang, Lili;Ma, Yuling;Tong, Litao;Wang, Fengzhong;Wang, Shanshan;Liu, Xiaojiao;Zhang, Yuhong;Zhou, Sumei

作者机构：

关键词： heat and relative humidity treatment (HRH); highland barley; gamma-aminobutyric acid; GABA-shunt pathway; polyamine degradation pathway

期刊名称：FOODS （ 影响因子：5.561； 五年影响因子：5.94 ）

ISSN：

年卷期： 2022 年 11 卷 5 期

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收录情况： SCI

摘要： In this study, heat and relative humidity (HRH) treatment was applied in highland barley for gamma-aminobutyric acid (GABA) accumulation. Tibetan highland barley cultivars (25) were selected for comparison and analysis. HRH treatment could accumulate GABA in several hours with low moisture content and high temperature, and the grains were treated for 2.5 h at 65 degrees C in this study. The GABA content of processed grains under HRH optimal condition ranged from 26.91 to 76.28 mg.100 g(-1), which was significantly higher than the initial content (12.78-43.00 mg.100 g(-1)). The highest GABA accumulation capacity was observed in two-row yellow cultivars (YT1), increasing from 36.52 to 76.28 mg.100 g(-1). Correlation analysis showed that the accumulation of GABA after HRH treatment was positively and significantly (p < 0.05) correlated with the contents of protein (0.52), total free amino acids (0.68), threonine (0.53), serine (0.51), glutamate (0.69), glycine (0.49), alanine (0.46), cysteine (0.57), tyrosine (0.50), lysine (0.53), proline (0.40), and glutamate decarboxylase (GAD) activity (0.62), which were closely related to GABA-shunt pathway. The polyamines contents, diamine oxidase (DAO) and polyamine oxidase (PAO) activities, as the substrates and critical enzymes of polyamine degradation pathway, showed no significant correlation with GABA accumulation. The results suggested that the main pathway of GABA accumulation in highland barley under HRH treatment was GABA-shunt pathway.

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