食品科学

• 基础研究 • 上一篇    下一篇

氧化羟丙基木薯淀粉的流变特性

刘亚伟,王瑞娟,曹立松,刘 洁,谢军红   

  1. 河南工业大学粮油食品学院,小麦和玉米深加工国家工程实验室,河南 郑州 450001
  • 出版日期:2015-09-15 发布日期:2015-09-11

Rheological Property of Oxidized Hydroxypropyl Tapioca Starch

LIU Yawei, WANG Ruijuan, CAO Lisong, LIU Jie, XIE Junhong   

  1. National Engineering Laboratory for Wheat and Corn Processing, School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China
  • Online:2015-09-15 Published:2015-09-11

摘要:

利用DHR-1流变仪,研究了氧化羟丙基木薯淀粉的静态流变和动态流变特性。结果表明,氧化羟丙基木薯淀粉糊为假塑性流体(n<1),符合Herschel-Bulkley模型(R2>0.98)。随着羧基含量和羟丙基摩尔取代度(molar substitution,MS)的增大,稠度系数k减小,非牛顿性减弱,趋近于牛顿流体。在整个振幅范围(1×10-4~1 rad),主要表现为黏性特性;随着振幅增加,样品的弹性模量(G’)和黏性模量(G”)变化不明显;随着羧基含量和羟丙基摩尔取代度(molar substitution,MS)的增大,G’和G”降低,损耗角正切(tanδ=G”/G’)增加。在频率范围(0.1~12.5 rad)内,随着频率增加,样品的G’和G”增加,tanδ变化不明显;随着羧基含量和MS的增大,G’和G”降低,tanδ增加。

关键词: 氧化羟丙基木薯淀粉, 流变特性, Herschel-Bulkley模型

Abstract:

A DHR-1 rheometer was used to determine the steady-state and dynamic rheological properties of oxidized
hydroxypropyl tapioca starch. The results showed the oxidized hydroxypropyl tapioca starch paste was a pseudoplastic
non-Newtonian fluid (n < 1) and the experimental data were fitted with Herschel-Bulkley model (R2 > 0.98). Increasing
carboxyl contents and hydroxypropyl molar substitution degree (molar substitution, MS) resulted in a decreased consistency
coefficient k and weakened non-Newtonian characteristics and the system tended to turn into a Newtonian fluid. Samples
exhibited a dominant elastic behavior over the entire amplitude range (1 × 10-4-1 rad). The storage and loss modulus of
samples varied slightly when the amplitude was increased. Increasing carboxyl contents and MS resulted in decreased
storage and loss modulus of samples and increased tanδ. The storage and loss modulus of samples increased and tanδ varied
slightly when the angular frequency was increased over the entire frequency range (0.1–12.5 rad). Increasing carboxyl
contents and MS resulted in decreased storage and loss modulus and increased tanδ of samples.

Key words: oxidized hydroxypropyl tapioca starch, rheological properties, Herschel-Bulkley model

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