Antioxidant activity and phenolic content of Paederia foetida and Syzygium aqueum.
The antioxidant activity of fresh and dried plant extracts of Paederia foetida and Syzygium aqueum were studied using beta-carotene bleaching and the 2,2'-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS) radical cation assay. The percentage of antioxidant activity for all extract samples using both assays was between 58 and 80%. The fresh samples of both plants had higher antioxidant activity than the dried samples. The results of the beta-carotene bleaching assay were correlated (R(2) = 0.9849) with those of the ABTS assay.
Osman
Hasnah
H
Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia. ohasnah@usm.my
Rahim
Afidah A
AA
Isa
Norhafizah M
NM
Bakhir
Nornaemah M
NM
D000975:Antioxidants / Q000032:analysis*; D052160:Benzothiazoles; D010636:Phenols / Q000032:analysis*; D010936:Plant Extracts / Q000737:chemistry; D019666:Rubiaceae / Q000737:chemistry*; D013451:Sulfonic Acids; D027842:Syzygium / Q000737:chemistry*; D019207:beta Carotene
D000975:Antioxidants; D052160:Benzothiazoles; D010636:Phenols; D010936:Plant Extracts; D013451:Sulfonic Acids; D019207:beta Carotene; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid