Simultaneous determination of malachite green, brilliant green and crystal violet in grass carp tissues by a broad-specificity indirect competitive enzyme-linked immunosorbent assay.
An immunizing hapten (4-(carboxymethoxy)phenyl)bis(4-(diethylamino)phenyl)methylium for brilliant green (BG), a triphenylmethane dye with a potential illegal use in fish feeding, was synthesized and used to produce polyclonal antibody (PcAb) against BG. Unexpectedly, the obtained PcAb showed high cross-reactivity (CR) to malachite green (MG) and crystal violet (CV) in an indirect competitive enzyme-linked immunosorbent assay (icELISA). After screening against three heterologous coating antigens, the icELISA exhibited good sensitivity and uniform response to BG (IC(50) of 1.98 ng mL(-1) and CR of 100%), MG (IC(50) of 1.61 ng mL(-1) and CR of 105%) and CV (IC(50) of 1.34 ng mL(-1) and CR of 142%) when using (4-(carboxymethoxy)phenyl)bis(4-(dimethylamino)phenyl)methylium as the coating hapten. Therefore, a broad-specificity icELISA for simultaneous determination of BG, MG and CV was developed. The recoveries of single analyte and mixture of three analytes from spiked grass carp tissues were estimated ranging from 74.94% to 110.39%. A statistically significant correlation of results was obtained between the developed icELISA and previously established HPLC approaches with the food-relevant three triphenylmethane dyes concentration range 1.83-200 ng mL(-1) (R(2)=0.9224), indicating good accuracy of the icELISA and suitability for the broad-specific detection of the three triphenylmethane dyes in grass carp tissues.
Guangdong Provincial Key Laboratory of Food Quality and Safety, South China Agricultural University, Guangzhou, China. shenyudong@scau.edu.cn
Yu-Dong
YD
Shen
Xing-Fei
XF
Deng
Zhen-Lin
ZL
Xu
Yu
Y
Wang
Hong-Tao
HT
Lei
Hong
H
Wang
Jin-Yi
JY
Yang
Zhi-Li
ZL
Xiao
Yuan-Ming
YM
Sun
D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002347:Carps; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004797:Enzyme-Linked Immunosorbent Assay; D005506:Food Contamination / Q000032:analysis; D005840:Gentian Violet / Q000032:analysis* / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000032:analysis* / Q000737:chemistry; D012394:Rosaniline Dyes / Q000032:analysis* / Q000737:chemistry; D014018:Tissue Distribution / Q000502:physiology
D000644:Quaternary Ammonium Compounds; D012394:Rosaniline Dyes; C005095:malachite green; C006798:brilliant green; D005840:Gentian Violet