Chitosan, as a novel bioadditive antioxidant for commodity polymer, is proposed. Chitosan is successfully conjugated with deoxycholic acid and gallic acid (chitosan‐DC‐GA) via a simple reaction using the 1‐ethyl‐3‐(3′‐dimethylaminopropyl) carbodiimide/ N ‐hydroxysuccinimide conjugating agent at room temperature in a heterogeneous system. Chitosan‐DC‐GA shows a deoxycholic acid (DC) and gallic acid (GA) content of about 40% each. Chitosan‐DC‐GA exhibits DPPH radical scavenging ability with EC 50 1 mg mL −1 based on the EPR technique evaluation. A model case study of chitosan‐DC‐GA with low‐density polyethylene (LDPE) confirms improvement in compatibility, as seen from the sheet clarity, as well as the good dispersion of chitosan‐DC‐GA in LDPE matrices, as observed by scanning electron microscope.
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Pasanphan et al. (2008) studied this question.
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