Abstract:
Leucomalachite green is major reduced metabolite of malachite green, which was
used as fungicide in aquatic animals. It was left and stored in the tissue of aquatic animals.
The consumption of the contaminated leucomalachite green aquatic animals caused cancer,
fetal abnormalities, and mutagenic. Therefore, the objective of this research was to develop
the immunochromatographic strip test using competitive immunosensor for detection of
leucomalachite green residual in aquatic animals.
The results revealed that the optimum conditions of the immunochromatographic strip test were as followed. The concentration of secondary antibody for control line was 0.1 mg/mL at the volume of 1 UL. The optimal concentration and volume of the LMG pAbcolloidalgold conjugate were 0.0025 mg/mL and 20 UL, respectively. The sample volume was 140 UL and the test time was 5 minutes. It was found that the immunochromatographic strip test performed high precision, accuracy, and specificity with a linear range of the concentration of 0.7 - 2 Ug/L. The limit of detection and the limit of quantitation were at 0.24 and 0.80 Ug/L, respectively.
After that, the immunochromatographic strip test was used for detection of leucomalachite green in the real samples and it showed that all samples were not contaminated with leucomalachite green. The advantage of the developed immunochromatographic strip test was that it was simple, rapid and suitable for on-sitedetection.