Development of sensitive immunoassays for the detection of the glucuronide conjugate of 3-phenoxybenzyl alcohol, a putative human urinary biomarker for pyrethroid exposure.
Kim-JH; Ahn-C; Ma-JS; Gee-JS; Hammock-BD
J Agric Food Chem 2007 May; 55(10):3750-3757
Pyrethroids are widely used in agriculture as insecticides. This study describes a sensitive enzyme-linked immunosorbent assay for the detection of the glucuronide conjugate of 3-phenoxybenzyl alcohol, a putative pyrethroid metabolite that may be used as a biomarker of exposure to pyrethroids. Four antisera were elicited against two different immunizing haptens. Antisera were characterized in combination with several coating haptens. The lowest IC50 value (0.5 ng/mL) was obtained with antiserum 1891 and 3-phenoxybenzoic acid-BSA conjugate as the coating antigen. Antiserum 1891 was highly selective for the target compound with an overall cross-reactivity of <0.3% to structurally related compounds. The assay sensitivity was negligibly affected by pH 4-9. A 5-fold improvement in IC50 was observed using a 10-fold concentrated phosphate-fuffered saline as the assay buffer. Compared to assays conducted in normal phosphate-fuffered saline, the maximal absorbance was almost identical. A good correlation (r 2 = 0.99 and 0.97 for urine samples A and B, respectively) was observed between spiked levels and the levels detected by the immunoassay.
Agricultural-chemicals; Agricultural-industry; Agriculture; Insecticides; Chemical-composition; Chemical-hypersensitivity; Chemical-reactions; Sensitization; Enzymatic-disorders; Enzymatic-effects; Urinalysis; Exposure-levels; Exposure-limits
Department of Entomology and UCD Cancer Research Center, University of California, Davis, California 95616
Agriculture; Cooperative Agreement
Journal of Agricultural and Food Chemistry
University of California - Davis