21096
In the present work , we have reviewed different alternatives reported in the literature to produce and purify chondroitin sulfate ( CS ) , hyaluronic acid ( HA ) and chitin / chitosan ( CH / CHs ) with the aim of proposing environmentally friendly processes by combination of various microbial , chemical , enzymatic and membranes strategies and technologies .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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