食品科学 ›› 2011, Vol. 32 ›› Issue (18): 154-158.doi: 10.7506/spkx1002-6630-201118032

• 工艺技术 • 上一篇    下一篇

紫甘薯色素提取及其稳定性研究

陈 杰,李进伟,张连富   

  1. 江南大学食品学院
  • 收稿日期:2018-06-20 修回日期:2018-06-20 出版日期:2011-09-25 发布日期:2011-09-24

Extraction and Stability of Purple Sweet Potato Pigment

CHEN Jie,LI Jin-wei,ZHANG Lian-fu   

  1. (School of Food Science and Technology, Jiangnan University, Wuxi 214122, China)
  • Received:2018-06-20 Revised:2018-06-20 Online:2011-09-25 Published:2011-09-24

摘要: 研究紫甘薯天然色素的提取及稳定性。利用响应面试验设计得出色素提取的最优条件是提取温度60℃、提取时间1h、料液比1:30、水溶液中酸化乙醇(乙醇:盐酸=85:15)体积分数80%,紫甘薯色素提取率理论值为12.4688mg/g,最优条件验证实验紫甘薯色素得率为12.3528mg/g。随着温度的升高和加热时间的延长,紫甘薯色素稳定性也下降;紫甘薯色素在中性和碱性条件下稳定性较差,因此在提取、贮藏、应用中宜采用酸性条件。Fe3+、Al3+两种金属离子对色素起保护作用,而Cu2+、Zn2+、Pb2+三种金属离子对色素起破坏作用;抗坏血酸能够显著的增加色素溶液的稳定性,而Na2SO3会降低色素溶液的稳定性。

关键词: 紫甘薯色素, 响应面, 提取, 稳定性

Abstract: Purple sweet potato pigment (PSPP) is a kind of natural pigment and has gained extensive concern in recent years. In this study, response surface methodology was employed to optimize the extraction conditions of PSPP. The results showed that the optimal extraction conditions were extraction temperature of 60 ℃, extraction time of 1 h, solid-to-liquid ratio 1:30, and acidic ethanol concentration of 80%. Under the optimal extraction conditions, the yield of PSPP was up to 12.4688 mg/g. In addition, the stability of PSPP was also investigated. Increasing temperature and extension of heating time could result in a decrease in PSPP stability. Similarly, the stability of PSPP revealed an obvious decrease in neutral and alkaline environments. Fe3+ and Al3+ could increase the stability of PSPP; on the other hand, Cu2+, Zn2+ and Pb2+ could lead to a decrease in PSPP stability. Moreover, ascorbic acid could significantly improve the stability of PSPP and Na2SO3 did harm to the stability of PSPP.

Key words: purple sweet potato pigment, response surface methodology, extraction, stability

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