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In this study, high molecular weight hyaluronic acid in powder form (HMW-HA, with average molecular weight of 1042kDa) was degraded to low molecular (LMW-HA, 200–230kDa) by several methods, and the changes in molecular structure and antioxidative activities brought about by each degradation method were compared. The degradation methods used were electron beam irradiation (EB), gamma ray irradiation...
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