title: Antioxidant activity and phenolic content of Paederia foetida and Syzygium aqueum.
abstract: 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.
authors.affiliation: Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia. ohasnah@usm.my
authors.forename: Hasnah
authors.initials: H
authors.lastname: Osman
authors.forename: Afidah A
authors.initials: AA
authors.lastname: Rahim
authors.forename: Norhafizah M
authors.initials: NM
authors.lastname: Isa
authors.forename: Nornaemah M
authors.initials: NM
authors.lastname: Bakhir
mesh_terms: 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
chemical_list: 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