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- W2150142005 abstract "ABSTRACT A new cholesterol flow injection analysis biosensor is described. It is based on a luminol/hydrogen peroxide electrochemiluminescence (ECL) reaction induced by a glassy carbon electrode polarised at + 425 mV vs a Pt pseudo reference. The cholesterol b8543158 sensing layer is based on cholesterol oxidase (COD) immobilised on either UltraBindTM membrane or Immunodyne membrane. The physicochemical properties of the UltraBindTM type membranes enable a high-performance biosensor to be obtained. A high salt concentration, 3 M NaCl, is shown to induce a 400% increase of the immobilised COD activity, and intermediate salt concentrations, from 1 to 1.5 M NaCl, induce a 230% increase of the H2O2 sensor performances. Both phenomena enable the achievement of a sensitive ECL cholesterol biosensor which exhibited a 800% increase of its performance in the presence of 2 M NaCl. In those optimised conditions, the determination of free cholesterol could be performed with a detection limit of 0.6 nmol and a detection ranging over at least two decades. When used in conjunction with a cholesterol esterase in solution, the biosensor enables the detection of free and total cholesterol in human sera, in 15 minutes with a good accuracy. The biosensor operational stability was satisfactory either with buffered standard solutions or with complex matrices since a total of 55 and 43 assays, respectively, could be performed with good reproducibility (CV = 4.8% and 8.3%) and without detectable loss of sensitivity." @default.
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- W2150142005 date "2000-01-01" @default.
- W2150142005 modified "2023-10-18" @default.
- W2150142005 title "Luminol Electrochemiluminescence-Based Biosensor for Total Cholesterol Determination in Natural Samples" @default.
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- W2150142005 doi "https://doi.org/10.1080/00032710008543158" @default.
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