College of Food Science, South China Agricultural University, Guangzhou 510642, China.
College of Food Science, South China Agricultural University, Guangzhou 510642, China.
Carbohydr Polym. 2018 Mar 15;184:164-170. doi: 10.1016/j.carbpol.2017.12.024. Epub 2017 Dec 14.
Microcrystalline cellulose (MCC) was prepared from Oolong tea waste by acid hydrolysis in the present study. Based on the single factor experiment results, the hydrolysis conditions were optimized by an orthogonal L(3) experiment. Results showed that the degree of polymerization (DP) and yield of MCC were strongly influenced by the time and temperature of hydrolysis, the concentration of HCl and the ratio of acid to material. Under optimal conditions (acid to materials ratio 1:20, HCl concentration 1.5 mol/L, 65 °C, 90 min), the yield and DP of the tea waste MCC were 86.7% and 145, respectively. Fourier transform-infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analysis indicated that tea waste MCC had cellulosic structure and was cellulose I type. Scanning electron microscopy (SEM) showed that MCC had shorter fibers with some holes on the rough surface. The MCC prepared from tea waste had good thermal stability.
本研究通过酸水解从乌龙茶废料中制备出微晶纤维素（MCC）。基于单因素实验结果，通过正交 L(3) 实验对水解条件进行了优化。结果表明，水解时间和温度、HCl 浓度和酸料比强烈影响 MCC 的聚合度（DP）和得率。在最佳条件下（酸料比 1:20、HCl 浓度 1.5 mol/L、65°C、90 min），茶废料 MCC 的得率和 DP 分别为 86.7%和 145。傅里叶变换-红外光谱（FT-IR）和 X 射线衍射（XRD）分析表明，茶废料 MCC 具有纤维素结构，属于纤维素 I 型。扫描电子显微镜（SEM）显示，MCC 具有较短的纤维，粗糙表面上有一些孔。由茶废料制备的 MCC 具有良好的热稳定性。
