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Title of Journal: Microchim Acta

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Abbravation: Microchimica Acta

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Springer Vienna

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DOI

10.1002/chin.199109340

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1436-5073

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Microfluidic system for enzymeless electrochemical

Authors: Miguel García Laura GarcíaCarmona Alberto Escarpa
Publish Date: 2014/10/14
Volume: 182, Issue: 3-4, Pages: 745-752
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Abstract

We report on a microfluidic system for the electrochemical determination of inulin It is making use of electrosynthesized catalytically active nanowires NWs made from nickel or copper 6 μm long and 300 nm wide capable of detecting inulin at a working voltage of +070 V vs Ag/AgCl and a pH value of 120 with a sensitivity that is 40 times better than that for fructose its monomer The copper nanoelectrodes were characterized by field emission scanning electron microscopy and photoelectron spectroscopy which revealed a random distribution of copper NWs Their core is found to be metallic while the outer few atomic layers 2 nm are oxidized CuO Both the intraelectrode repeatability with RSDs of 8  for 5 samples and the interelectrode reproducibility RSDs 9  n =4 are very good The approach presented here allows for a direct determination of both inulin and free fructose within 300 s with a LOD of 3 μM for inulin Inulin was determined with recoveries ranging from 97 to 103  with RSDs of 4  This approach is perceived to represent an alternative to enzymatic assays or HPLC based approaches It has the additional advantages of rapidity and low sample and reagent consumption Given the electrochemical behavior of inulin the results also suggest that this method will pave novel avenues towards the detection of complex carbohydratesA microfluidic system for the electrochemical determination of inulin makes use of electrosynthesized catalytically active nanowires capable of detecting inulin at a working voltage of +070 V vs Ag/AgCl and a pH value of 120 The approach allows for a direct determination of both inulin and free fructose within 300 s with a LOD of 3 μM for inulin

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