In the model, the first-order terms A and B and the second-order terms (A 2 ), (B 2 ), and (C 2 ) all have a highly significant effect on the degree of substitution on acetylation.
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Optimization of the process of acetylation and carboxymethylation for a polysaccharide from Gastrodia elata and antioxidant and immunomodulatory activities test.
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