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《Chinese Journal of Pesticide Science》 2008-04
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Ethephon Residues and Product Quality of Tomatoes by Accelerated Ripeners

GUO Xiao1,2, LI Dan-hong3, ZHAO Wen1, LI Hui-ling1, ZHANG Hui-yan1(1.Department of Food Science and Technology,Hebei Agricultural University,Baoding 071001,Hebei Province,China;2.Beijing Railway Administration Shijiazhuang Station,Shijiazhuang 050000,China;3.Hebei Software Institute of Architectural Technology,Baoding 071000,Hebei Province,China)  
Ethephon residues and product quality of tomatoes treated with different accelerate ripening methods or concentrations of ethephon were determined.Tomatoes were treated by artificial ripener in the field .Post-harvest tomatoes were dipped in different concentrations of ripeners and let stay for several days before determination.Ethephon residues were analyzed by headspace gas chromatography.Lycopene and vitamin C contents were determined by liquid chromatography.The results indicated that ethephon residues were high in post-harvest fruit treated by dip method.It reached 1.98 mg/kg at a dip concentration of 4 000 mg/L. Ethephon residues exceeded national maximum residue limit (MRL) of 2 mg/kg by whether field smear method (highest residue level of 2.29 mg/kg) or post-harvest dip method (highest residue level of 3.14 mg/kg) at concentration of 6 000 mg/L.Meanwhile,the contents of lycopene,vitamin C,sugar and soluble solid obviously decreased by 55.6%,13.6%,13.6% and 7.1%respectively in tomatoes at dip concentration of 2 000 mg/L.But the content of organic acid did not decreased obviously.It was concluded that ethephon residue may exceeded MRL in tomatoes, at high concentration treatment,and the fruit quality may be significantly affected by means of accelerate ripening treatment.
【Fund】: 河北农业大学科研发展基金资助
【CateGory Index】: S481.8;S641.2
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