Verfahren zur O2-sensitiv-enzymatischen Ascorbinsäure-Durchflußmessung Oxygen-Sensitive-Enzymatic Measurement of Ascorbic Acid with a Flow-Through-Method

Schindler, J. G.; Hochstetter, R.; Aziz, O.; Riemann, W.; Schäl, W.

doi:10.1515/bmte.1978.23.10.231

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…5,6 So the detection of ascorbic acid has attracted great attention in clinical, pharmaceutical and food industry. Previously reported methods for its determination include enzymatic methods, 7,8 spectrophotometry, [9][10][11] fluorometry, 12,13 chromatography [14][15][16][17] and chemiluminescence [18][19][20] etc.…”

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confidence: 99%

Electrocatalytic Oxidation of Ascorbic Acid on Quaternized Carbon Nanotubes/Ionic Liquid-Polyaniline Composite Film Modified Glassy Carbon Electrode

Zhu

Wang

2013

J. Electrochem. Soc.

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A novel composite film modified electrode was prepared by combining the strong electrostatic adsorption ability of positively quaternized carbon nanotubes (q-CNTs) and excellent electroactivity of ionic liquid (1-methylimidazolium trifluoroacetate) doped polyaniline (IL-PANI) for the determination of ascorbic acid (AA). The q-CNTs/IL-PANI/GCE was characterized by cyclic voltammetry, FT-IR spectroscopy, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The IL-PANI film with uniform morphology showed good conductivity and electrochemical activity even in neutral solutions, this make it perfect as a matrix for the uniform dispersion of q-CNTs. Moreover, the electrostatic interaction between the q-CNTs and the doped CF 3 COO − anions of IL-PANI film led to form a stable q-CNTs/IL-PANI composite film on GCE. The q-CNTs/IL-PANI/GCE exhibited excellent electrocatalytic oxidation activity toward ascorbic acid and was successfully used for the determination of AA by amperometry at +0.05 V under pH 7.0. The amperometric current was increased linearly with AA concentration from 20 nM to 4 μM, and the detection limit was 0.25 nM (S/N = 3). The analysis of beverage and urine real samples was performed and the obtained results were satisfactory. The q-CNTs/IL-PANI composite film modified electrode provided a novel electrochemical sensor with high sensitivity and stability for the determination of AA.

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