Pico molar assay of riboflavin in human urine using voltammetry |
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Authors: | Suw Young Ly Hai Soo Yoo Joon Young Ahn kwang hee Nam |
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Affiliation: | 1. Biosensor Research Institute, Seoul National University of Science and Technology, 172, gongreung 2 dong Nowon gu, Seoul 139-743, South Korea;2. Korea Ocean R&D Institute, P.O. Box 29, Ansan 425-600, South Korea |
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Abstract: | Using a new type of DNA and carbon nano tube (CNT) mixed paste electrode using cyclic and square wave anodic stripping voltammetric (SWASV) methods, this study presents an assay of riboflavin (RF) under optimum conditions. Results of the experiment yielded a low working concentration range of nanograms with 1–10 and 10–170 ng L−1 and 5–105 μg L−1, at an accumulation time of 80 s in a 0.1 M H3PO4 electrolyte solution. A relative standard deviation of 30 μg L−1 was observed at an accuracy level of 0.1164% (n = 15) under optimum conditions. The detection limit (S/N) was pegged at 0.2 ng L−1 (5.31 × 10−13 mol L−1 RF). The proposed method was successfully applied to an actual human urine and drug sample, and can be applied to assays of other biological samples. |
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Keywords: | Riboflavin Voltammetry DNA Graphite nanotube Paste electrode Urine |
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