Agaricus bisporus (Lange) Sing. Chaidam, a special brown mushroom with thick body indigenous in Chaidam basin, was used for fungal chitosan extraction. FTIR, XRD and DSC spectra showed that fungal chitosan was similar to commercial chitosan from aquatic sources. Fungal chitosan and commercial chitosan were used to coat on betulinic acid-loaded liposomes modified with biosurfactants mannosylerythritol lipid A (MEL-A), respectively. After chitosan coating, the mean size, zeta potential and encapsulation efficiency of both liposomes increased. The liposomes coated with fungal chitosan were discovered to have smaller size and higher zeta potential. Furthermore, the wall material MEL-A and coating material chitosan endue liposomes with increased antioxidant capacity. Fungal chitosan coated liposomes also have stronger antioxidant effects than commercial chitosan. The findings implied that the fungal chitosan coated liposomes modified with MEL-A can be considered as a promising delivery system with enhanced antioxidant effects for bioactive compounds.
Keywords: Antioxidant; Betulinic acid; Biosurfactants; Fungal chitosan; Liposomes.
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