A rapid and sensitive fluorescence polarization immunoassay(FPIA),based on a polyclonal antibody,has
been developed for the detection of sodium benzoate in spiked samples.The immunogen and
fluorescein-labeled analyte conjugate were successfully synthesized,and the tracer was purified by
TLC. Under the optimalassay conditions,the FPIA show s adetection range of 0.3–20.0 μg mL1 for
sodium benzoate with a detection limit of 0.26 μg mL1 in the borate buffer.In addition,the IC50 value
was 2.48 μg mL1, and the cross-reactivity of the antibodies with ten structurally and functionally
related analogs were detected respectively.Four kinds of food samples(energy drink,candy,ice sucker,
RIOTM cocktail) were selected to evaluate the application of FPIA inreal systems.There coveries were
96.68–106.55%in energy drink;95.78–100.80%in candy,86.97–102.70%in icesucker,and103.58–
109.87%in benzoate contained sample RIOTM cocktail,and coefficients of variation of this method were
all lower than 11.25%.Comparing with the detection results of HPLC,the developed FPIA has comparative
performance in the real sample determination.The results suggest that the FPIA developed in this study
is arapid,convenient and simple method,which issuitable to be used as a screening tool for
homogeneous detection of sodiumben zoate in food products.
A rapid and sensitive fluorescence polarization immunoassay(FPIA),based on a polyclonal antibody,hasbeen developed for the detection of sodium benzoate in spiked samples.The immunogen andfluorescein-labeled analyte conjugate were successfully synthesized,and the tracer was purified byTLC. Under the optimalassay conditions,the FPIA show s adetection range of 0.3–20.0 μg mL1 forsodium benzoate with a detection limit of 0.26 μg mL1 in the borate buffer.In addition,the IC50 valuewas 2.48 μg mL1, and the cross-reactivity of the antibodies with ten structurally and functionallyrelated analogs were detected respectively.Four kinds of food samples(energy drink,candy,ice sucker,RIOTM cocktail) were selected to evaluate the application of FPIA inreal systems.There coveries were96.68–106.55%in energy drink;95.78–100.80%in candy,86.97–102.70%in icesucker,and103.58–109.87%in benzoate contained sample RIOTM cocktail,and coefficients of variation of this method wereall lower than 11.25%.Comparing with the detection results of HPLC,the developed FPIA has comparativeperformance in the real sample determination.The results suggest that the FPIA developed in this studyis arapid,convenient and simple method,which issuitable to be used as a screening tool forhomogeneous detection of sodiumben zoate in food products.
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