不同稻種發芽米γ-胺基丁酸與DPPH自由基清除能力之變異

Variations of γ-aminobutyric Acid and DPPH Radical Scavenging Activity in Germinated Brown Rice of Different Rice Cultivars

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

《作物、環境與生物資訊》 10卷1期 (2013/03) Pp. 44-59

https://doi.org/10.30061/CEB.201303_10(1).0004

摘要

糙米經發芽後可提升γ-胺基丁酸（γ-aminobutyric acid; GABA）及抗氧化成分，具增進人類健康與預防疾病等效果，因此發芽米被視為21世紀生機主食之一。本研究中將臺灣22種水稻品種栽植於2009年第2期作與2010年第1期作，收穫後之糙米製成不同胚芽長度發芽米後，探討發芽米GABA含量與DPPH自由基清除能力之變化。結果顯示，發芽米GABA含量與DPPH自由基清除能力表現並無一致性；所有品種中以臺中秈10號、臺秈2號及高雄141號發芽米之GABA含量較高，DPPH自由基清除能力表現較佳者為臺稉17號。發芽米GABA含量最高之最佳胚芽長度為1.5 mm；但糙米經發芽後，DPPH自由基清除能力有降低的現象；多數品種糙米發芽17、18或19 h後，其GABA含量及DPPH自由基清除能力表現並無太大的變化。除了環境因素，本研究結果顯示發芽米之GABA含量與DPPH自由基清除能力主要受品種之影響，即隨稻種而異

關鍵字

品種 ； 發芽米 ； γ-胺基丁酸（GABA） ； DPPH-自由基清除能力

並列摘要

Germinated brown rice becomes a popular functional food in the 21st century, because it contains γ-aminobutyric acid (GABA) and antioxidants. These two compounds increase through germination process and are known good for human health and other beneficial functions and empower to prevent disease infection. This study used twenty-two local rice cultivars harvested from second crop of 2009 and first crop of 2010 to provide the prospected variability of these two compounds in germinated brown rice. Results showed that GABA content and DPPH radical scavenging activity in germinated brown rice were not linked together. Of twenty-two investigated rice cultivars, TCS10, TS2 and KH141 had higher GABA contents and TK17 had superior DPPH radical scavenging activity. The suitable length of shoot in germinated brown rice having the highest GABA content was 1.5 mm. The scavenging capacity of DPPH radical was in a decreasing trend during germinated process. The content of GABA and scavenging activity of DPPH maintained in a stable level in 17-19 h after germination in most cultivars. Results suggest that except environment factors, GABA content and DPPH radical scavenging activity of germinated brown rice are cultivar specific.

並列關鍵字

Rice variety ； Germinated brown rice ； γ-aminobutyric acid (GABA) ； DPPH radical scavenging activity