Abstract
For detection of phenolic compounds in environmental water samples we propose an amperometric biosensor based on tyrosinase immobilized in titania sol–gel. The analytical characteristics toward catechol, p-cresol, phenol, p-chlorophenol, and p-methylcatechol were determined. The linear range for catechol determination was 2.2 × 10−7–1.3 × 10−5 mol L−1 with a limit of detection of 9 × 10−8 mol L−1 and sensitivity 2.0 × 103 mA mol−1 L. The influence of sample matrix components on the electrode response was studied according to Plackett–Burman experimental design. The potential interferents Mg2+, Ca2+, \( {\text{HCO}}^{ - }_{3} \), \( {\text{SO}}^{{2 - }}_{4} \), and Cl−, which are usually encountered in waters, were taken into account in the examination. Cu2+ was also taken into account, because CuSO4 is sometimes added to a water sample, as a preservative, before determination of phenolic compounds. It was found that among the ions tested only Mg2+ and Ca2+ did not directly affect the electrode response. The developed biosensor was used for determination of catechol in spring and surface water samples using the standard addition method.
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Kochana, J., Gala, A., Parczewski, A. et al. Titania sol–gel-derived tyrosinase-based amperometric biosensor for determination of phenolic compounds in water samples. Examination of interference effects. Anal Bioanal Chem 391, 1275–1281 (2008). https://doi.org/10.1007/s00216-007-1798-6
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DOI: https://doi.org/10.1007/s00216-007-1798-6