Effect of defatted green tea extract, polyphenol fraction and other compounds present in green tea extract on the photostability of deltamethrin applied to cotton discs

Document Type : Original Article

Authors

Pesticide Chemistry Department, Faculty of Agriculture, P.O.Box 21545, Alexandria University, Alexandria, Egypt

10.21608/jpces.2016.459317

Abstract

GC-MS analysis showed that the major constituents of green tea extract were heptadecene-(8)-carbonic acid, 4-o-methyl gallic acid, procatechouic acid, and small amount of caffeine. Defatted methanolic green tea extract and its ethyl acetate
fractions (polyphenol extract) divided to groups [green tea extract and major constituents] were examined for their effect in an increasing the photostability of deltamethrin insecticide under simulating sun radiation condition. In the absence of
the UV absorber, only 5.4% of the initial amount of deltamethrin applied on cotton disc screen was recovered after the six hours of irradiation under simulating sunlight (equivalent to 96 hour of natural sunlight at mid day). Whereas, 96.800 ± 1.2% was recovered from the control sample kept in the dark at 35 ºC.  However, A5 [(+) -catechin] was the most effective compound acting as UVabsorber among the the UV absorber tested. It provided more protection to deltamethrin against photolysis process.  38.2% of the initial amount applied to the target screen that exposed to UV
radiation for 6 hours was recovered and 61.8% deltamethrin was lost by photolysis in the presence of (+) – catechin.The other compounds could arranged in decreasing order, according to the degree of protection performance, were tannic acid, green tea Polyphenols,defatted green tea extractandcaffeine.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 21, Issue 1
2016
Pages 45-53

Files

Share

How to cite

Statistics