超声波处理在硫酸法测定汉麻木质素含量中的应用  

Application of ultrasonic treatment in determining lignin in raw hemp with sulfuric acid liquid

作　　者：李贝 刘柳[1] 向叶平 张瑞云[1] 俞建勇[1] LI Bei;LIU Liu;XIANG Yeping;ZHANG Ruiyun;YU Jianyong(Donghua University, Shanghai 201620, China)

机构地区：[1]东华大学

出　　处：《上海纺织科技》2018年第4期50-52,共3页Shanghai Textile Science & Technology

摘　　要：由于大麻木质素结构不均匀且复杂紧密，采用硫酸法测定木质素含量时，很难完全水解纤维素以及半纤维素，导致大麻木质素含量测定结果不稳定。利用超声波处理大麻原麻，使大麻木质素物理结构得到开松，达到大麻结构的均匀化目的．再结合硫酸法测定大麻原麻木质素含量。主要探究了不同的硫酸浓度、水解时间以及超声波处理时间对大麻原麻木质素含量的影响，并确定测定大麻木质素含量的最佳条件为：超声波处理15min，硫酸质量分数72％，硫酸水解时间12h。采用此方法测得大麻木质素含量相对标准偏差平均值为0.25％，结果稳定精准度高，为大麻木质素定量分析方法标准的建立提供了方向。As the Inhomogeneity and complexity of lignin in raw hemp structure, it is hard to determine lignin of raw hemp with sulfuric acid liquid which can dissolve the cellulose and hemicellulose completely. The determination results are not stable. The ultrasonic treatment is used to treat hemp and raw bast to break the tough structure of lignin in raw hemp to obtain evenness of hemp structure. Then the sulfuric acid method is used to determine lignin in raw hemp. The effects of sulfuric acid concentration, hydrolysis time and processing time of ultrasonic on lignin content from raw hemp are studied. The optimum process of determining lignin in raw hemp is： ultrasonic treatment for 15 min, hydrolysis for 12 h with 72% of sulfuric acid. This method has a relative standard deviation of 0.25%, which means the results are accurate and stable in determining lignin in raw hemp. It provides directions to establish method standard for quantitative analysis of lignin content in raw hemp.

关 键 词：汉麻 原麻 超声波 木质素 定量分析 硫酸 

分 类 号：TS127[轻工技术与工程—纺织材料与纺织品设计]