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Antioxidant and Pro-oxidant Activity of Green Tea Extracts in Marine Oils by Udaya N. Wanasundara; Fereidoon Shahidi is a Agricultural and Biological Sciences article available to read on EtoBox.

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The activity of green tea extracts (GTE) on the oxidation of refined, bleached and deodorized (RBD) seal blubber oil (SBO) and menhaden oil (MHO) was examined under Schaal oven conditions at 65°C. Progression of oxidation was monitored using weight gain, peroxide value (PV) and 2-thiobarbituric acidreactive substances (TBARS) data. GTE exhibited a pro-oxidant effect in both oils examined, perhaps due to the catalytic effect of their chlorophyll constituents. Therefore, in follow-up experiments, a column chromatographic technique was employed to remove chlorophyll from GTE. The resultant dechlorophyllized green tea extract (DGTE) was applied to both SBO and MHO at 100, 200, 500 and 1OOOppm levels. The antioxidant activity of DGTE was compared with the effects of the commonly-used antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ) at 200ppm and a-tocopherol at 500ppm. DGTE at >200 ppm exhibited excellent antioxidant activity in both oils and its efficacy was higher than that of BHA, BHT and a-tocopherol, but less than that of TBHQ.

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Author

Udaya N. Wanasundara; Fereidoon Shahidi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0308-8146)

Published

1998

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)