This study was conducted to investigate dioxin compound concentrations and the distribution characteristics of monomers in two kinds of common feed additives (choline chloride and vitamin K3). Seventeen samples of choline chloride and 29 samples of vitamin K3 were detected. Dioxin compounds were extracted by accelerated solvent extraction system (ASE), purified by fluid management system (FMS), and quantitative analyzed by isotope dilution high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS). The results showed as follows:the concentrations of dioxin compounds in choline chloride and vitamin K3 were 4.370 and 13.871 pg/g, respectively. The average concentration of toxic equivalent was 0.184 and 0.379 pg WHO-TEQ/g, respectively. The toxic equivalent concentration in 1 choline chloride sample and 5 vitamin K3 samples exceeded the executive standard of European Union (0.75 pg WHO-TEQ/g). OCDF was the dominant contributory congener both in the samples of choline chloride and vitamin K3, and the main contributors of toxic equivalent were 2,3,4,7,8-PeCDF and 1,2,3,4,7,8-HxCDF. Furthermore, PCDFs accounted for 88% and 97% of total toxic equivalent in choline chloride and vitamin K3, respectively, and was the main pollutant in the distribution characteristic of pollutional congeners.
LIU Zhibin
,
ZHANG Jianqing
,
JIANG Yousheng
,
ZHOU Jian
,
LI Shengnong
. Feed Additives of Choline Chloride and Vitamin K3:Dioxin Compound Concentrations and the Distribution Characteristics of Monomers[J]. Chinese Journal of Animal Nutrition, 2012
, 24(10)
: 2006
-2012
.
DOI: 10.3969/j.issn.1006-267x.2012.10.021
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