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投稿时间：2023-02-23
投稿时间：2023-02-23
中文摘要: 该研究以茶渣为原料，通过碱处理、漂白处理提取茶渣纤维素，采用硫酸水解法制备茶渣纳晶纤维素（tea residue nanocrystalline cellulose，TRNC），利用显微成像技术、傅里叶变换红外光谱、X-射线衍射仪、热重分析仪等技术对TRNC 的微观形貌、化学官能团、晶体结构、热稳定性等理化性质进行表征。探究TRNC 对大豆分离蛋白膜机械性能、水蒸气透过率和水溶性的影响。结果表明，TRNC 呈典型的针状结构，Zeta 电位值为（-32.76±2.11）mV，结晶度为62.36%。经TRNC 强化的大豆分离蛋白膜，拉伸强度、水蒸气阻隔性能和耐水性能均有显著提升，而断裂伸长率有所下降。TRNC 有潜力用作蛋白基可食膜的结构增强剂。
Abstract:In this study，tea residue nanocrystalline cellulose（TRNC）was obtained from tea residue through alkali treatment，bleaching treatment，and sulfuric acid hydrolysis.The micro-morphology，chemical functional groups，crystal structure and thermal stability of TRNC were characterized by micro-imaging technology，Fourier transform infrared spectroscopy，X-ray diffractometer，and thermogravimetric analyzer.The effects of TRNC on mechanical properties，water vapor permeability and water solubility of soybean protein isolate membrane were investigated.The results showed that the TRNC had a typical acicular structure，Zeta potential was（-32.76±2.11）mV and crystallinity was 62.36%.The tensile strength，water vapor barrier properties and water resistance of soybean protein isolate film were significantly improved，while the elongation at break decreased after the addition of TRNC.TRNC has the potential to be used as a structural enhancer for protein-based edible films.
keywords: tea residue powder nanocrystalline cellulose soybeans protein isolate composite film physicochemical property
文章编号：202314006 中图分类号： 文献标志码：
基金项目:茶树生物学与资源利用国家重点实验室开放基金项目（SKLTOF20220111、SKLTOF20220123）；安徽省高等学校科学研究重点项目（2022AH050882）
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