食品科学 ›› 2012, Vol. 33 ›› Issue (7): 110-113.doi: 10.7506/spkx1002-6630-201207024

• 基础研究 • 上一篇    下一篇

冷榨菜籽油的流变特性

刘昌盛,杨 湄,黄凤洪*,郑 畅,周 琦   

  1. 中国农业科学院油料作物研究所
  • 出版日期:2012-04-15 发布日期:2012-04-20
  • 基金资助:
    国家现代农业(油菜)产业技术体系项目(nycytx-005);“十一五”国家科技支撑计划项目(2009BAD9B08); 中国农业科学院油料作物研究所所长基金项目(1610172009002)

Rheological Properties of Cold-Pressed Rapeseed Oils

LIU Chang-sheng,YANG Mei,HUANG Feng-hong*,ZHENG Chang,ZHOU Qi   

  1. (Institute of Oil Crops Research, Chinese Academy of Agricultural Sciences, Wuhan 430062, China)
  • Online:2012-04-15 Published:2012-04-20

摘要: 以3种不同芥酸含量的油菜籽为原料,通过低温压榨获得冷榨菜籽油(cold-pressed rapeseed oils,CROs),分析其静态和动态流变特性以及特征指标,同时采用Bingham模型对其流体行为进行拟合。结果表明:在剪切速率为0.1~200s-1条件下,CROs呈剪切变稀的假塑性流体;当剪切速率大于5s-1时,CROs表现为牛顿流体行为;温度是影响CROs流变性质的重要因素,CROs的黏度、损耗模量(GO`)和塑性稠度系数(ηp)随着温度升高而降低,但是温度变化对CROs的贮能模量(GO`)影响较小;另外CROs的黏度和GO`随芥酸含量增加而提高,而且ηp值与芥酸含量成正相关。

关键词: 菜籽油, 冷榨, 流变特性, Bingham模型

Abstract: Cold-pressed rapeseed oils (CROs) were obtained from three rapeseed samples with different erucic acid by cold-pressing. The rheological properties and characteristics of CROs were investigated, and the Bingham model was used to describe the rheological behavior of CROs. The results showed that CROs behaved as a shear-thinning pseudoplastic fluid at shear rates varying from 0.1s-1 to 200 s-1 and showed Newtonian behavior at shear rates greater than 5 s-1. It was also found that temperature was an important factor affecting the rheological properties of CROs. The viscosity, loss modulus (G'') and plastic consistency coefficients (ηp) of CROs decreased with the increase of temperature. The storage modulus (GO`) of CROs was less affected by temperature. Furthermore, the viscosities and GO` of CROs increased with increasing erucic acid content. The values of ηp of CROs were positively correlated with the level of erucic acid.

Key words: rapeseed oils, cold-pressing, rheological properties, Bingham model

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