HAcanbepurifiedusingmanymethods ﹒ InoneUSApatentliterature [ 20 ] thefermentation brothwasheatedatatemperatureofab℃,anddiatomiteasfilteraidwasusedto thebacteria ﹒ HAwasprecipitatedfromthefiltrate,ethanol,acetone。Withthedevelopmentofmodernsepera,moreandmor ......