Abstract

This study was designed to examine in vitro antioxidant of extracts of Teucrium parviflorum Schreber. The plants were extracted successively in ethanol and water using soxhlet-apparatus. They were screened for possible antioxidant activity using the ABTS^• (2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid)) radical scavenging capacity, DPPH^• (2,2-diphenyl-1-picrylhydrazyl) radical scavenging capacity, superoxide anion radical scavenging capacity, hydrogen peroxide scavenging capacity, reducing power and metal chelating activities. These various antioxidant activities were compared with standard antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and α-tocopherol. The extracts of T. parviflorum showed strong antioxidant activity and effective antioxidant assay. This antioxidant property depends on concentration and increase with increased amount of sample. In addition, total phenolic compounds in the extracts of T. parviflorum were determined as pyrocatecol equivalents. The results obtained in the present study indicated that T. parviflorum is a potential source of natural antioxidant.

Keywords: Teucrium parviflorum, antioxidant activity, medicinal plants, extract, flower, leaves.

Abbreviation

BHA, Butylated hydroxyanisole; BHT, butylated hydroxytoluene;ABTS^•, 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid; DPPH^•, 2,2-diphenyl-1-picrylhydrazyl radical; ROS, reactive oxygen species; RSC, free radical scavenging capacity; NADH, nicotinamide adenine dinucleotide; TCA, trichloracetic acid; NBT, nitroblue tetrazolium; PMS, phenazine methosulphate.