食品科学 ›› 0, Vol. ›› Issue (): 32-36.

• 基础研究 • 上一篇    下一篇

紫甘薯花青素体外抑制α-糖苷酶活性研究

孟 文,贺 炜,钟英丽,王 征*   

  1. 湖南农业大学生物科学与技术学院
  • 收稿日期:2010-11-26 修回日期:2011-08-10 出版日期:2011-09-15 发布日期:2011-08-30
  • 通讯作者: 王征 E-mail:wz8918@163.com

Inhibitory Effect of Anthocyanins from Purple Sweet Potato on Alpha-Glucosidase Activity

  • Received:2010-11-26 Revised:2011-08-10 Online:2011-09-15 Published:2011-08-30

摘要: 为了研究紫甘薯花青素体外对α-糖苷酶活性的影响,采用HPLC和LC-MSn对紫A19(ZA1)和京薯(JS6)中花青素的含量和组分进行对比分析。结果表明:两种紫甘薯花青素含量分别为52.44mg/g和39.46mg/g,其组分基本一致,不同的是ZA1另含牵牛花色素类色素,而JS6另含天竺葵色素类色素;这两种紫甘薯花青素对α-糖苷酶活性都有抑制效果,但ZA1的抑制效果最佳,当加入质量浓度为0.1mg/mL 600μL(即抑制剂ZA1占总反应体积的18%)、抑制时间15min、抑制温度40℃时对α-糖苷酶活性抑制率可达50%以上,用Lineweaver-Burk双倒数作图考察其抑制类型,根据曲线可判定为竞争性抑制,抑制常数Ki=5.43×10-2mmol/L,vmax=1.71μmol/(L·min)。

关键词: 紫甘薯, 花青素, α-糖苷酶, 抑制

Abstract: In order to investigate the effect of anthocyanins from purple sweet potato on   cultivars ZA1 and JS6 were comparatively analyzed by HPLC and LC-MSn. The results indicated  that petunidin was exclusively contained in ZA1 compared to pelargonidin in JS6. Anthocyanins from both purple sweet potato cultivars had inhibitory effect on α-glucosidase activity. Anthocyanins from purple sweet potato cultivar ZA1 showed better anti-α-glucosidase activity with an inhibitory rate of more than 50% obtained after 15 min of reaction at 40 ℃ and 0.1 mg/mL 600 μL concentration (the ratio of anthocyanins weight to total reaction volume was 18%). The Lineweaver-Burk plot showed that anthocyanins from ZA1 inhibited α-glucosidase activity in a competitive pattern with a Ki of 5.43 × 10-2 mmol/L and  vmax of 1.71 μmol/(L·min).

Key words: purple sweet potato, anthocyanin, α-glucosidase activity, inhibition 

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