Abstract
The authors describe a highly sensitive colorimetric method for the determination of ascorbic acid. It is based on the finding that nanosheets of reduced graphene oxide that were functionalized with poly(styrene sulfonate) (PSS-rGO) possess peroxidase-like activity that catalyzes the oxidization of the substrate 3,3’,5,5’-tetramethylbenzidine (TMB) by H2O2 to form a blue product (oxidized TMB; oxTMB) that can be quantified by photometry or visually. If ascorbic acid is present, a fraction of H2O2 will be consumed and hence less oxTMB (with an absorption peak at 652 nm) will be formed. Ascorbic acid can be quantified by photometry in the 0.8 to 60 μM concentration range with a 0.15 μM detection limit. The method was successfully applied to the determination of ascorbic acid in vitamin C tablets and orange juice.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (21205108, 21505122), the Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry of China), and the Technology Foundation for Selected Overseas Chinese Scholars (Ministry of Personnel of China).
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Chen, J., Ge, J., Zhang, L. et al. Reduced graphene oxide nanosheets functionalized with poly(styrene sulfonate) as a peroxidase mimetic in a colorimetric assay for ascorbic acid. Microchim Acta 183, 1847–1853 (2016). https://doi.org/10.1007/s00604-016-1826-3
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DOI: https://doi.org/10.1007/s00604-016-1826-3