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Antioxidant activity of lycopene extracted from tomato paste towards trichloromethyl peroxyl radical CCl3O2

Author:
Zhao, Yaping, Qian, Suping, Yu, Wenli, Xue, Zheng, Shen, Hong, Yao, Side, Wang, Dapu
Source:
Food chemistry 2002 v.77 no.2 pp. 209-212
ISSN:
0308-8146
Subject:
absorption, acetone, antioxidant activity, bleaching, high performance liquid chromatography, isopropyl alcohol, lycopene, tomato paste
Abstract:
The objectives of this paper were to evaluate the antioxidant activity of lycopene towards the trichloromethyl peroxyl radical (CCl3O2·) and to obtain a precise rate constant using a pulse radiolysis technique. Lycopene was extracted and purified from tomato paste and its purity reached 95.0% (HPLC analysis). CCl3O2· was generated from a pulsed aqueous air-saturated solution of 2-propanol (2 M), acetone (1 M) and CCl4 (10(−2) M). The observed spectrum showed an intense bleaching of the lycopene ground-state absorption in the region 350–450 nm and the bleaching rate constant was determined to be 1.17×10(9) M−1s−1, which indicated a rapid interaction between lycopene and CCl3O2·.
Agid:
385371