【摘要】 以抗坏血酸、阿魏酸和2,6-二叔丁基-4-甲基苯酚(BHT)为对照,对萌发糙米中的2种多酚提取物的抗氧化能力进行测定。结果表明:萌发糙米中可溶性和不溶性多酚物质含量分别为(6.03±0.03)、(32.35±0.05)mg/100g;可溶性和不溶性阿魏酸含量分别为(4.82±0.01)、(20.04±0.77)mg/100g;5种试样对O―2的清除率顺序为BHT>阿魏酸>不溶性多酚>可溶性多酚>抗坏血酸;清除OH能力的顺序为抗坏血酸>阿魏酸>BHT>可溶性多酚>不溶性多酚;清除DPPH自由基能力的顺序为不溶性多酚>阿魏酸>BHT>可溶性多酚>抗坏血酸;168h时5个试样抗油脂氧化能力大小顺序为阿魏酸>BHT>可溶性多酚>不溶性多酚>抗坏血酸。因此,萌发糙米中的多酚物质具有一定的抗氧化能力,部分指标优于抗坏血酸和BHT。更多还原

【Abstract】 The antioxidant potential of soluble and insoluble polyphenol extracts of germinated brown rice was evaluated and compared with that of ascorbic acid,ferulic acid and BHT as positive controls.Germinated brown rice contained(6.03 ± 0.03) mg/100 g of soluble polyphenols,(32.35 ± 0.05) mg/100 g of insoluble polyphenols,(4.82 ± 0.01) mg/100 g of soluble ferulic acid and(20.04 ± 0.77) mg/100 g of insoluble ferulic acid.The radical scavenging activity of five samples investigated followed the decreasing order: BHT,ferulic acid,insoluble polyphenols,soluble polyphenols and ascorbic acid for superoxide anion radical,ascorbic acid,ferulic acid,BHT,soluble polyphenols and insoluble polyphenols for hydroxyl radical,insoluble polyphenols,and ferulic acid,BHT,soluble polyphenols and ascorbic acid for DPPH radical.In decreasing order of anti-lipid oxidation activity(lard POV after 168 h of constant temperature incubation),these samples were ferulic acid,BHT,soluble polyphenols,insoluble polyphenols and ascorbic acid.Hence,polyphenols from germinated brown rice has antioxidant activity and are superior to ascorbic acid and BHT in terms of some antioxidant properties.更多还原