大豆生物解离纤维素可食性膜制备与成膜机理研究
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国家重点研发计划项目(2016YFD0401402)和国家自然科学基金重点项目(31430067)


Preparation of EAEP Fiber Films and Its Mechanism of Film Formation
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    摘要:

    大豆生物解离技术提取油脂和蛋白后,产生的残渣主要是大豆不溶性纤维素。合理利用该部分纤维素有益于提高生物解离技术的经济可行性。以大豆生物解离纤维素为成膜基材,加入柠檬酸、丙三醇制备可食性膜,研究了柠檬酸添加量、丙三醇添加量及交联时间对生物解离纤维素可食性膜拉伸强度、断裂伸长率、水蒸气透过率的影响,并通过响应面法建立了上述三因素对可食性膜水蒸气透过率影响的模型。通过模型分析得出,三因素对可食性膜水蒸气透过率的影响程度从大到小依次为:丙三醇添加量、交联时间、柠檬酸添加量。经优化得到的最佳工艺条件为柠檬酸添加量20%、丙三醇添加量36%、交联时间5min;在此条件下进行试验,得到可食性膜的水蒸气透过率为1.81g·m/(h·Pa·m2);通过可食性膜扫描电镜图得出,在最优工艺条件下制备的可食性膜表面较为平整光滑。此外,红外光谱结果表明,可食性膜拉伸强度及水分阻隔性的增加是由于柠檬酸与生物解离纤维素发生了交联酯化反应,丙三醇的添加可能会影响柠檬酸与纤维素的反应。大豆生物解离纤维素可以作为基料制备出具有较好机械性的可食性膜,研究结果可为大豆生物解离纤维素可食性膜的生产提供参考。

    Abstract:

    Enzyme-assisted aqueous extraction processing (EAEP) is an alternative method to extract oil which is safer and more environmental-friendly. EAEP results in four fractions: free oil, oil-in-water emulsion, liquid fraction (skim), and residual fraction. The surplus amounts of residual are the limitation of EAEP. The residue contains a large amount of fiber. EAEP residue fiber based edible films containing citric acid and glycerol was prepared. In the single-factor experiment, the effect of citric acid concentration, glycerol concentration, crosslink time on the tensile strength, elongation at break, water vapor permeability of EAEP residue fiber based edible films was studied. In order to optimize the process parameters and investigate the interrelationship between the three factors and water vapor permeability, response surface methodology was employed. Results indicated that the water vapor permeability was influenced the most by glycerol concentration, crosslink time and the least by citric acid concentration. The optimum conditions were as follows: citric acid concentration of 20%, glycerol concentration of 36% and the crosslink time of 5min. Under the optimum conditions, the water vapor permeability of the EAEP residue based edible film was 1.81g·m/(h·Pa·m2). The scanning electron microscopy showed that the edible film prepared under the optimum process conditions had a relatively smooth surface. The infrared spectrum analysis indicated that crosslink may have taken place between citric acid and the fiber of EAEP residue. Glycerol may affect the reaction between citric acid and the fiber. The results can provide a reference for the production of EAEP residue based edible film.

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江连洲,徐靓,张莉,隋晓楠,李杨,陈惠惠.大豆生物解离纤维素可食性膜制备与成膜机理研究[J].农业机械学报,2017,48(8):335-342.

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  • 收稿日期:2017-05-08
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  • 在线发布日期: 2017-08-10
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