摘要
对葡萄籽多酚提取物在高温操作及贮存过程中的稳定性进行了研究。结果表明,25℃时,葡萄多酚在80%的乙醇溶液中可存放5d,在水溶液中可存放3d。高温处理(90℃时超过12h,50℃时超过24h)使葡萄籽提取物的颜色变深,原花青素含量降低,但对总酚含量及DPPH自由基的清除能力影响不大。水不溶性葡萄多酚与水溶性酚类物质在相同的总酚含量下,对DPPH的清除能力无明显差异。
The stability of polyphenols from grape seeds during storage and h eat process was investigated.The results showed that grape seed polyphenols cou ld be stored at25℃for5days in80%ethanol solution or3days in water withou t obvious change.When grape seed polyphenols was incubated at50℃for24h or at90℃for12h,the color and the concentration of procyanidin changed signif icantly,whereas the concen-tration of total phenols and DPPH free radical scav enging ability remained almost constant.The study also indicated that under the identical concentration of total phenols,the water-insoluble grape seed polyp he-nols had the same DPPH scavenging ability as that of the water-soluble grap e seed polyphenols.
出处
《天津农业科学》
CAS
2003年第2期18-21,共4页
Tianjin Agricultural Sciences
基金
天津市自然基金重点资助项目(993804011)
