The result showed that total phenolic contents in mgGAE/g and total flavonoid contents in mgRE/g in the
twenty-one Thai side dish vegetables varied considerably. All selected kinds of Thai side dish vegetables
contained phenolic compound and total phenolic contents ranged from 0.20±0.002 (Boub ngu) to 1.66±0.
mgGAE/g (Pak bung thai maung) in different vegetable species (Table 2). Pak bung thai maung contained
consistently the highest phenolic compound(1.66±0.006 mgGAE/g) and the lowest was observed in Boub ngu
(0.20±0.002 mgGAE/g). And another part of this study, the total flavonoid contents in all kinds of Thai side
dish vegetables varied widely between 0.04±0.001 mgRE/g(Ma khua lai and Pak ka lum plee) and
0.14±0.001(Ma khua puang and Kra jeab kheaw) (Table 2). The highest flavonoid content was found in Ma
khua puang and Kra jeab keaw (0.14±0.001 mgRE/g), although the lowest flavonoid content was observed in
Ma khua lai and Pak ka lum pree (0.04±0.001 mgRE/g).
The result of the antioxidant activity of the twenty-one Thai side dish vegetables by DPPH radical
scavenging and FRAP assay was given in table 2. Kha-on displayed the highest antioxidant activity with
91.99±1.36 %inhibit by DPPH assay while the lowest antioxidant activity by DPPH assay was presented in