食品科学

• 基础研究 • 上一篇    下一篇

微波处理淀粉自由基的生长和衰减

刘意骁,范大明,王丽云,连惠章,赵建新,张 灏,陈 卫   

  1. 1.江南大学食品学院,食品科学与技术国家重点实验室,江苏 无锡 214122;
    2.无锡华顺民生食品有限公司,江苏 无锡 214218
  • 出版日期:2014-07-15 发布日期:2014-07-18

Growth and Annihilation of Microwave-Induced Free Radicals in Rice Starch

LIU Yi-xiao, FAN Da-ming, WANG Li-yun, LIAN Hui-zhang, ZHAO Jian-xin, ZHANG Hao, CHEN Wei   

  1. 1. State Key Laboratory of Food Science and Technology, School of Food Science and Technology,
    Jiangnan University, Wuxi 214122, China; 2. Wuxi Huashun Minsheng Food Co. Ltd., Wuxi 214218, China
  • Online:2014-07-15 Published:2014-07-18

摘要:

研究在微波加热方式下大米淀粉自由基的生长以及储存过程中的衰减。运用电子顺磁共振的检测手段和图谱拟合软件,对微波处理淀粉的自由基相对数量和结构进行分析。结果表明:微波处理淀粉产生在室温下能够较长时间存在的自由基;淀粉在微波处理后会产生以碳为中心的自由基;在1 600 W(160 W/g)功率下自由基数量的增长速率大于800 W(80 W/g)功率下的增长;在停止微波处理后,自由基信号在衰减之前有一段短时间的增长期;实验从微波处理淀粉中分离出3 种自由基成分,主要成分为以葡萄糖环C1为中心的自由基。

关键词: 微波, 淀粉, 自由基, 电子顺磁共振

Abstract:

In this article, the growth of microwave-induced free radicals in rice starch and their annihilation process during
storage were investigated. Electron paramagnetic resonance (EPR) and signal simulation software were applied to investigate
the relative quantity and structure of microwave-treated starch radicals. The results showed that microwave treatment could
induce starch radicals which could exist for a long time at room temperature. The starch radicals were carbon-centered
radicals. The growth of radicals was much faster when rice starch was treated at 1 600 W (160 W/g) than at 800 W (80 W/g).
After microwave treatment, the signal intensity started to drop after a short period of increase. Three components were
separated from microwave-induced starch radicals in the experiment. The main component was the radical located at the C1
position of the glucose ring.

Key words: microwave, starch, radical, electron paramagnetic resonance (EPR)