Contents of Total Phenolic, Total Flavonoid, Vitamin C and Antioxidant Activity in Khoa-hom, Tong-dee and Manee-e-san Pomelo Strain

Abstract

Pomelo (Citrus grandis (L.) Osbeck) is a popular Thai economic fruit that contained with antioxidant substances, helps to reduce risk factors and prevent various diseases, especially non-communicable diseases. This study is aimed to determine the total phenolic content, total flavonoid contents, vitamin C, and antioxidant activity from different parts of three pomelo strains, which are Khao Hom, Thongdee, and Manee Isan. From the study found that the total phenolic content was highest in the mesocarp part of Khaohom strain (98.11 ± 8.70 mg equivalent to gallic acid/1 g of dry weight) while the highest total flavonoid content was found in the pulp of Khao Hom strain (54.60 ± 1.05 mg equivalent to quercetin/1 g of dry weight) and the highest vitamin C content was found in the pulp of Thong Dee strain (57.64 ± 2.17. milligrams/1 g of dry weight). DPPH and FRAP assays had been used to determine the antioxidant activities and found that the pulp from Khaohom and Thongdee strain had the best of these activities. From this study, it was found that Kaohom strain had a higher content of important substances and antioxidant activity than other stains. In particular, the pulp and exocarp. From these information indicates the active substances can be found all parts of pomelo which may be developed into food or health products in the future.