Study on Biochemical Degumming Process of Mulberry Fiber, Part 2: Orthogonal Optimization Analysis

Abstract

The mulberry fiber is extracted from the mulberry bast by biochemical degumming method. Based on the single factor experiment, the orthogonal experiment is further designed. The optimal process parameters for biochemical combined degumming are as follows: pretreatment stage, sulfuric acid solution concentration 2.5g/L, time 1h, temperature 60°C, bath ratio 1:20; alkaline pectinase treatment stage, alkaline pectinase solution concentration 46g/L, time 8h, temperature 50°C, bath ratio 1:20, solution pH = 9; alkali boiling stage, sodium hydroxide solution concentration 10g/L, alkali boiling time 3h, sodium silicate 30g/L, temperature 100°C, bath ratio 1:20; xylanase treatment stage, the concentration of xylanase solution 9g/L, the time 4h, the temperature 50°C, the bath ratio 1:20, and the solution pH = 4.8. By comparing the properties of mulberry fiber obtained by biochemical degumming and chemical degumming, it is found that the biochemical degumming process has less damage to fibers and more effective removal of lignin and hemicellulose.

Keywords

• mulberry fiber
• biochemical degumming
• pectinase
• alkali boiling
• xylanase
• orthogonal design