Publication: Ceruloplasmin oxidase activity as a biomarker of lead exposure
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2005-01-01
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13419145
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2-s2.0-14544306177
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Mahidol University
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Journal of Occupational Health. Vol.47, No.1 (2005), 56-60
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Warin Leelakunakorn, Rosawan Sriworawit, Suganya Soontaros (2005). Ceruloplasmin oxidase activity as a biomarker of lead exposure. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/17111.
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Ceruloplasmin oxidase activity as a biomarker of lead exposure
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Abstract
The most sensitive method used in monitoring the blood lead-level is atomic absorption spectrophotometry. Its limitation due to its high cost has made delta-aminolaevulinic acid dehydratase (δ-ALAD) inhibition more popular. This work demonstrates that ceruloplasmin (Cp), the blue-colored copper containing alpha-2 globulin (α2 globulin) glycoprotein in serum, can serve as a high-potential biomarker for lead exposure. Sephadex G-200 column chromatography demonstrated that lead-intoxicated patient serum transferrin and ceruloplasmin are bound to lead. The ceruloplasmin's oxidase and δ-ALAD activities are reduced when the blood-lead level increases (thresholds of 10.0 and 12.5 μg/100 mL respectively), with a correlation coefficient of -0.8643 and -0.6785 which accurately estimate a blood lead level of 74.7% and 46.0%, respectively. When the blood-lead level was less than 20 μg/100 mL, correlation coefficients of -0.5785 and -0.6963 suggested that Cp may serve as a good biomarker. Other advantages in using Cp in monitoring the bloodlead level were its stability: the enzyme was more stable at -20°C, for more than 2 wk, and its practical and rapid determination procedure.