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ANTIBACTERIAL, ANTIOXIDANT ACTIVITY, AND SHELF-LIFE EXTENSION OF STRAWBERRY OF EXOPOLYSACCHARIDE PRODUCED BY LACTIPLANTIBACILLUS PLANTARUM MT12Ngoc Tung Quach1, Thi Hong Van Dao2, Quyet Tien Phi2,*Abstract: Recently, exo-polysaccharides (EPSs) as coating materials are known to be new alternative for food preservation. The aim of the present study was to explore biological activities of EPS produced by lactic acid bacteria and apply this EPS to extend the shelf-life of strawberry. Here, out of 30 lactic acid bacteria, only bacterial isolate MT12 showed antibacterial activity against Staphylococcus epidermidis ATCC 12228, Salmonella typhimurium ATCC 14028, and Escherichia coli ATCC 8739 with the inhibition zones ranging from 7.2 - 9.3 mm. Further analysis revealed antibacterial activity was dose-dependent manner. The most promising isolate MT12 was identified morphologically and molecularly using 16 S rRNA gene sequence analysis asLactiplantibacillus plantarum. Antioxidant assay revealed that the EPS had the highest scavenging ability against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and hydroxyl radicals at 1200 %u00b5g/mL. When coated by the EPS, the weight loss ratio and malondialdehyde content of strawberry reach 8.1 %u00b1 0.6% and 6.1 %u00b1 0.5% on the 1 Institute of Biotechnology, Vietnam Academy of Science and Technology; qn.tung@ibt.ac.vn2 Hanoi Open University; hongvancnsh@hou.edu.vn* Correspondence: tienpq@ibt.ac.vn