光照與pH值對發芽米GABA、抗氧化物含量及活性之影響

Brown Rice under Treatments of Different Light Sources and pH

張雅琪(Ya-Chi Jhang) ； 吳志文(Chih-Wen Wu) ； 林素汝(Su-Ju Lin)

《作物、環境與生物資訊》 10卷2期 (2013/06) Pp. 85-97

https://doi.org/10.30061/CEB.201306_10(2).0001

摘要

The biosyntheses of γ-aminobutyric acid (GABA) and antioxidants are mainly induced by adverse conditions in most crops. This study selected brown rice of eight varieties bred in Taiwan that produced in first crop of 2011. The tested materials were subjected to treatments of different light sources and pH buffer solutions, and the germinated brown rice were analyzed to determine changes in contents of GABA, total phenolics and flavonoids as well as DPPH radical scavenging activity. Results showed that GABA content of germinated brown rice was increased by the uses of ultraviolet (UV) and far-infrared (FIR) radiation combined with immersion in a pH 6.5 solution treatment during the germination process of brown rice, particularly in cultivars 'TNG78' and 'TS2'. Most brown rice varieties treated with different light sources or pH buffer solutions during germination showed no significant differences (P ＜ 0.05) in DPPH radical scavenging activity and flavonoids content. However, by FIR radiation plus immersion in a pH 5.5 solution treatment would increase DPPH radical scavenging activity. With both UV radiation and immersion in a pH 5.5 solution treatment would promote higher total phenolics content relative to other treatments, while it would decrease flavonoids content when UV radiation was joined with other buffer solutions. Among the tested samples of germinated brown rice, 'TNG78' and 'KH147' showed better DPPH radical scavenging activity and higher antioxidants content.

關鍵字

發芽米 ； γ-胺基丁酸 ； DPPH自由基清除能力 ； 總酚 ； 類黃酮

並列摘要

The biosyntheses of γ-aminobutyric acid (GABA) and antioxidants are mainly induced by adverse conditions in most crops. This study selected brown rice of eight varieties bred in Taiwan that produced in first crop of 2011. The tested materials were subjected to treatments of different light sources and pH buffer solutions, and the germinated brown rice were analyzed to determine changes in contents of GABA, total phenolics and flavonoids as well as DPPH radical scavenging activity. Results showed that GABA content of germinated brown rice was increased by the uses of ultraviolet (UV) and far-infrared (FIR) radiation combined with immersion in a pH 6.5 solution treatment during the germination process of brown rice, particularly in cultivars 'TNG78' and 'TS2'. Most brown rice varieties treated with different light sources or pH buffer solutions during germination showed no significant differences (P ＜ 0.05) in DPPH radical scavenging activity and flavonoids content. However, by FIR radiation plus immersion in a pH 5.5 solution treatment would increase DPPH radical scavenging activity. With both UV radiation and immersion in a pH 5.5 solution treatment would promote higher total phenolics content relative to other treatments, while it would decrease flavonoids content when UV radiation was joined with other buffer solutions. Among the tested samples of germinated brown rice, 'TNG78' and 'KH147' showed better DPPH radical scavenging activity and higher antioxidants content.

並列關鍵字

Germinated brown rice ； γ-aminobutyric acid (GABA) ； DPPH radical scavenging activity ； Total phenolics ； Flavonoids