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Chitosan is a natural biopolymer derived from chitin present in the exoskeletons of crustaceans. Its diverse applications span biomedical products, agriculture, and cosmetics. Notably, chitosan has been effectively utilized for chemical modifications and stabilizing homogeneous catalysts. Among these modifications, doping with acids or inorganic salts stands out. In some cases, acid chitosan exhibits superior catalytic activity compared to the unmodified form. This review aimed to elucidate recent advancements in acidic chitosan as a renewable and recoverable catalyst for various reactions. The discussion encompasses different doping methods using organic acids and inorganic salts to highlight the development in this field.
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