食品科学 ›› 2006, Vol. 27 ›› Issue (11): 71-74.

• 基础研究 • 上一篇    下一篇

水分含量对草莓玻璃化转变温度的影响

  叶秀东,  周国燕,  华泽钊, 闫琰   

  1. 上海理工大学低温医学与食品冷冻研究所
  • 出版日期:2006-11-15 发布日期:2011-11-28

Effect of Water Content on the Glass Transition Temperature of Strawberry

   Ye-Xiu-Dong,   Zhou-Guo-Yan,   Hua-Ze-Zhao, YAN  Yan   

  1. Institute of Cryomedicine and Food Refrigeration, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Online:2006-11-15 Published:2011-11-28

摘要: 在冻干和低温保存中,玻璃化转变温度是一个非常重要的参数。本文用差示扫描量热仪测量得到不同湿基水分含量的草莓汁的玻璃化转变温度。实验发现水分含量较高时(>50%),草莓发生的是部分玻璃化转变,不同湿基水份含量草莓汁的Tg’基本相同,水分对其的影响较小。而水分含量较低时(<45%),草莓降温时往往出现完全玻璃化转变,不同湿基水分含量草莓的Tg有很大不同,完全玻璃化转变温度随着水分含量的减少而升高,拟合得到Tg随水分变化的公式。

关键词: 玻璃化转变温度, 草莓, 差示量热扫描, 部分玻璃化转变温度

Abstract:  Glass-transition temperature is a very important parameter in freeze-drying and cryopreservation. The glass- transition temperature of strawberry with different water content are measured using DSC. It is found that the partial glass transition appears when the water content of strawberry is higher than 50%. The Tg’ of strawberry with different water content are same and the water content has little influence on it. The complete glass transition appears when the water content is lower than 45%. The water content has great influence on Tg. The Tg increases with the decrease of water content. The function between Tg and the water content is gotten.

Key words:  , glass transition temperature; strawberry; differential scanning calorimetry; partial glass transition temperature;