食品与发酵工业 >

2021 , Vol. 47 >Issue 11: 82 - 88

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.026484

研究报告

磁性纤维素纳米晶体与水溶性聚合物间相互作用分析及其乳化特性探究

  • 户昕娜 ,
  • 朱帅 ,
  • 马涛 ,
  • 卢舒瑜 ,
  • 赵婧 ,
  • 胡小松 ,
  • 宋弋 ,
  • 廖小军
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  • 1(国家果蔬加工工程技术研究中心(中国农业大学),北京,100083)
    2(农业部果蔬加工重点开放实验室,(中国农业大学),北京,100083)
    3(食品科学与营养工程学院(中国农业大学),北京,100083)
博士研究生(宋弋副教授为通讯作者,E-mail:587sy@163.com)

收稿日期: 2020-12-16

  修回日期: 2021-01-12

  网络出版日期: 2021-07-16

基金资助

国家自然科学基金面上项目(31871814)

收起

Analysis of interaction between magnetic cellulose nanocrystal and water-soluble polymer and its emulsion characteristics

  • HU Xinna ,
  • ZHU Shuai ,
  • MA Tao ,
  • LU Shuyu ,
  • ZHAO Jing ,
  • HU Xiaosong ,
  • SONG Yi ,
  • LIAO Xiaojun
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  • 1(National Engineering Research Center for Fruits and Vegetable Processing (China Agricultural University), Beijing 100083, China)
    2(Key Laboratory of Fruits and Vegetable Processing, Ministry of Agriculture (China Agricultural University), Beijing 100083, China)
    3(College of Food Science and Nutritional Engineering (China Agricultural University), Beijing 100083, China)

Received date: 2020-12-16

  Revised date: 2021-01-12

  Online published: 2021-07-16

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摘要

以纤维素纳米晶体(cellulose nanocrystal,CNC)为生物基模板合成磁性纤维素纳米晶体(magnetic cellulose nanocrystal,MCNC),通过石英晶体微天平探究其与不同的水溶性聚合物的相互作用,研究不同乳化体系用于稳定Pickering乳液的特性差异并揭示其稳定机理。结果显示,甲基纤维素(methylcellulose,MC)可吸附于 MCNC表面,降低乳化体系的油-水界面张力,提高乳液体系的黏度,使乳液具有良好的存储稳定性。而羟丙基甲基纤维素(hydroxypropyl methylcellulose,HPMC)在MCNC表面的吸附则相对微弱。冷冻扫描电镜观察发现,单独MCNC 棒状纳米粒子堆积于乳液液滴表面,而MCNC/MC 复合物则连接于液滴之间形成了“神经元状”网络,表明由MCNC单独或MCNC/MC 协同稳定的乳液符合固体颗粒界面膜理论和三维黏弹粒子网络机理,而MCNC/HPMC协同稳定的乳液中仅能观察到凸起的HPMC分子,在液滴表面难以观察到棒状MCNC,因此推测MCNC、HPMC在油-水界面的吸附可能为竞争性的。

关键词： 磁性纤维素纳米晶体; 水溶性聚合物; 乳液; 相互作用; 流变学

本文引用格式

户昕娜 , 朱帅 , 马涛 , 卢舒瑜 , 赵婧 , 胡小松 , 宋弋 , 廖小军 . 磁性纤维素纳米晶体与水溶性聚合物间相互作用分析及其乳化特性探究[J]. 食品与发酵工业, 2021 , 47(11) : 82 -88 . DOI: 10.13995/j.cnki.11-1802/ts.026484

Abstract

Magnetic cellulose nanocrystals (MCNC) were successfully synthesized using CNC as a template in this study. Quartz crystal microbalance with dissipation (QCM-D) was employed as a tool to study the interaction between MCNC and water-soluble polymers. The characteristic of emulsion and stability mechanism was evaluated. QCM-D measurement revealed that methylcellulose (MC) could absorb onto the surface of MCNC, thus reducing the oil-water interfacial tension and increasing the viscosity of the emulsion. Therefore, the long-term stability of MCNC/MC Pickering emulsion was improved within 28 days. The adsorption of hydroxypropyl methylcellulose (HPMC) on the MCNC surface was relatively weak. Moreover, cryo-SEM revealed that the deposition of rod-shaped MCNC on the surface of the droplet, while MC molecules formed neuron-shaped networks connecting the neighboring droplets. So, our results suggested that the stabilization mechanism of Pickering emulsions stabilized by MCNC alone or MCNC/MC synergistically conformed to solid particle interface membrane theory and 3D viscoelastic network particle mechanism. In the MCNC/HPMC Pickering emulsion, only bulgy HPMC could be found on the surface of droplets without clear recognition of rod-shaped MCNC. It was inferred that adsorption of MCNC and HPMC at the oil-water interface may be competitive.

Key words： magnetic cellulose nanocrystal; water-soluble polymer; emulsion; interaction; rheology

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