Composition change in fermentation broth in process of hemp fast microbial retting

In order to prove up the mechanism of hemp fast microbial retting,by using hemp retting high performance strain Dm111,the degumming rate and correlative parameter in fermentation broth was measured periodically in laboratory.The results indicated that quantity of viable organism and the degumming rate increased incessantly at prophase,then the trend became mild;the enzymatic activity of pectase and xylanase increased slowly at prophase,increased quickly at intermediate stage and degraded at anaphase.But the enzymatic activity of cellulase maintained stable and low in the whole retting course.pH change curve presented like ″V″;the curve change of reducing sugar shaped like a ″M″ in the whole retting peocess,that is,it had two peak values.The COD,proteins,residue in fermentation broth and retting time was positive correlation.The level of residue accounted for 27% of hemp phloem.