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Redox reaction-modulated fluorescence biosensor for ascorbic acid oxidase assay by using MoS2 quantum dots as fluorescence probe.
Li, Ning; Zhang, Feng; Sun, Wenying; Zhang, Lili; Su, Xingguang.
Afiliação
  • Li N; Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China; Department of Respiratory, The Third Hospital of Jilin University, Changchun, 130012, China.
  • Zhang F; Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China.
  • Sun W; Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China.
  • Zhang L; State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, Jilin University, Changchun, 130012, PR China.
  • Su X; Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China. Electronic address: suxg@jlu.edu.cn.
Talanta ; 222: 121522, 2021 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-33167232
ABSTRACT
Herein, a sensitive fluorescence (FL) biosensor for the assay of ascorbic acid oxidase (AAO) was established based on the fluorescence resonance energy transfer (FRET) between MoS2 quantum dots (MQDs) and CoOOH nanoflakes. CoOOH nanoflakes as effective FL quencher could quench the FL signal of MQDs on the basis of FRET. When ascorbic acid (AA) was added to the MQDs/CoOOH nanoflakes system, the FL signal was restored due to the redox reaction between CoOOH nanoflakes and AA, in which CoOOH nanoflakes were reduced to Co2+ by AA. In the presence of AAO, the recovered FL signal of MQDs was quenched again because of the enzymatic catalytically reaction between AAO and AA, in which AA was oxidized to dehydroascorbic acid (DHA) and then prevented the decomposition of CoOOH nanoflakes. Under the optimal experimental conditions, this developed fluorescence method exhibited good linear ranges from 2 to 10 mU mL-1 and 10-40 mU mL-1 with a low detection of limit of 0.8 mU mL-1 for AAO detection. And the limit of quantification (LOQ) of 2.6 mU mL-1 was obtained. The proposed biosensor showed high sensitivity and selectivity, and was successfully applied for AAO determination in human serum samples.
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Talanta Ano de publicação: 2021 Tipo de documento: Artigo País de afiliação: China

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Talanta Ano de publicação: 2021 Tipo de documento: Artigo País de afiliação: China
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