Abstract:Using Perilla essential oil as raw material, the antioxidant and antibacterial activities of Perilla essential oil microcapsule powder prepared by different treatment of two wall materials, gum Arabic and octenyl starch ester, were studied and compared. The structure of the microcapsule powder was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The results showed that with the increase of the amount of microcapsule powder, the antioxidant capacity was gradually enhanced. When the amount of microcapsule powder was 7 mg, the scavenging ability of DPPH radical, hydroxyl radical and ABTS radical prepared by octenyl succinate starch ester reached 89.19%, 84.58% and 97.93%, respectively. When the optimum dosage was 5 mg, the antibacterial effect of the octenyl succinate starch ester wall material Perilla essential oil microcapsule powder on B. subtilis and E. coli was the best; when the dosage was 4 mg, the bacteriostatic effect on S. aureus was the best; the antibacterial rates of tomato early disease bacteria and watermelon wilt bacteria reached 31.58% and 90.48% respectively. Scanning electron microscopy (SEM), infrared spectroscopy (IR) and thermogravimetric analysis (TG) showed that the octenyl succinate starch ester perilla essential oil microcapsules were spherical, with a complete surface and shallow depression, and the embedding process was only physical encapsulation. The results showed that the microcapsule powder of Perilla essential oil prepared by octenyl succinic acid starch ester had strong oxidation resistance and good antibacterial effect, and had broad application prospect.
