EVALUATION OF ANTIOXIDANT POTENTIAL OF ASIMINA TRILOBA (L.) DUNAL FLOWERS AND FRUITS

Abstract

This study aimed to test the antioxidant parameters of the flower and fruit ethanol extracts of 15 genotypes of Asimina triloba (L.) Dunal. (AzTr-01 – AzTr-15)  collected in the M.M. Gryshko National Botanical Garden (Kyiv, Ukraine). Antioxidant activity of the extracts of the investigated genotypes was measured with free radical scavenging activity (FRSA) by the DPPH method and molybdenum reducing power (MRP) expressed as mg TE (Trolox equivalent) per g of DW (dry weight). The  total polyphenol content (TPC) was expressed as mg GAE (gallic acid equivalent) per g of DW, total flavonoid content (TFC) was expressed as mg QE (quercetin equivalent) per g of DW, and total phenolic acid content (TPAC) expressed as mg CAE (caffeic acid equivalent) per g of DW. It was determined that the flower and fruit extracts of A. triloba demonstrated 5.45-77 and 2.33-7.21 mg TE/g of FRSA, respectively. Depending on a genotype, MRP of the flower and fruit extracts was 85.13-114.65 and 98.19-261.33 mg TE/g, respectively. TPC of the flower extracts ranged from 40.63 to 55.47 mg GAE/g and fruit extracts from 22.59 to 38.13 mg GAE/g. The flower extracts demonstrated 22.54-36.18 mg QE/g of TFC and 9.31-16.24 mg CAE/g of TPAC. The fruit extracts exhibited 15.07-30.55 mg QE/g and 3.11-6.58 mg CAE/g. These results indicated that various plant parts of A. triloba genotypes are appropriate for usage  in food and pharmaceutical products as a raw material with a high content of biologically active compounds.