Abstract

• Avocado (Persea americana Mill.) is well known traditional medicinal plant and one of the most important fruit crops of the local market in Myanmar. According to the phytochemical investigation of avocado seeds, it was observed that phenolic compounds and flavonoids were present in the fruit seeds. Semi-quantitative elemental analysis of avocado seeds was performed by EDXRF method. Potassium and calcium were present as the considerable amounts in the avocado seeds. The nutritional values of avocado seeds were determined by AOAC method. It was observed that carbohydrate was the highest content and protein, fat and fiber were low contents in the sample. Screening of antimicrobial activities from avocado seeds was carried out by agar well diffusion method. In the screening, different crude extracts such as pet-ether, chloroform, ethylacetate, ethanol, methanol and water of avocado seeds were examined with the six microorganisms. According to the antimicrobial screening, avocado seeds possess antimicrobial activity. The antioxidant activity of water and ethanolic extract from avocado seeds was determined by DPPH free radical scavenging activity method using UV spectrophotometer. The ascorbic acid was used as a standard. The IC50 values of standard ascorbic acid, water and ethanolic extract were observed as 37.05, 45.05 and 93.17 µg / mL, respectively. Therefore, the antioxidant activity of water extract from avocado seed was more potent than that of ethanolic extract