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An Amperometric Biosensor Based on Alanine Dehydrogenase for the Determination of Low Level of Ammonium Ion in Water

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dc.contributor.authorLing, TLen_US
dc.contributor.authorAhmad, Men_US
dc.contributor.authorHeng, LYen_US
dc.date.accessioned2024-05-29T03:26:21Z
dc.date.available2024-05-29T03:26:21Z
dc.date.issued2011
dc.description.abstractAn amperometric electrochemical biosensor has been developed for ammonium (NH4+) ion detection by immobilising alanine dehydrogenase (AlaDH) enzyme in a photocurable methacrylic membrane made up of poly(2-hydroxyethyl methacrylate) (pHEMA) on a screen-printed carbon paste electrode (SPE). The current detected was based on the electrocatalytic oxidation of nicotinamide adenine dinucleotide reduced (NADH) that is proportional to the consumption of NH4+ ion whilst enzymatic amination of AlaDH and pyruvate is taking place. The biosensor was operated amperometrically at a potential of +0.6V and optimum pH 7. The NH4+ biosensor demonstrated linear response to NH4+ ion concentration in the range of 0.03-1.02 mg/L with a limit of detection (LOD) of 8.52 mu g/L. The proposed method has been successfully applied to the determination of NH4+ ion in river water samples without any pretreatment. The levels of possible interferents in the waters were negligible to cause any interference on the proposed method. The analytical performance of the biosensor was comparable to the colorimetric method using Nesslerisation but with much lower detection limit and linear response range at ppb level.
dc.identifier.doi10.1155/2011/980709
dc.identifier.issn1687-725X
dc.identifier.scopusWOS:000208864900026
dc.identifier.urihttps://oarep.usim.edu.my/handle/123456789/12103
dc.languageEnglish
dc.language.isoen_US
dc.publisherHindawi Publishing Corporationen_US
dc.relation.ispartofJournal Of Sensors
dc.sourceWeb Of Science (ISI)
dc.titleAn Amperometric Biosensor Based on Alanine Dehydrogenase for the Determination of Low Level of Ammonium Ion in Water
dc.typeArticleen_US
dspace.entity.typePublication

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