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• W2334410799 abstract "Streptococcus pyogenes, also known as group A streptococcus (GAS), is a Gram positive human pathogen responsible for invasive and noninvasive human infections with a high incidence rate. Traditional detection methods involve cell culture and PCR, which are limited by long processing times or the need for high cost equipment. Impedance-based electrochemical immunosensors provide an alternative by which precise and rapid quantitative detection of the organism can help with rapid clinical decisions. To bring a biosensor for point-of-care applications to market, strict optimization of each level of construction and operation is required. In this paper, commercial screen-printed gold electrodes have been used to construct polytyramine (Ptyr)-based immunosensors. Biotin tagged whole antibodies against S. pyogenes were conjugated to Ptyr amine group via biotin-NeutrAvidin coupling. Sensors were optimized at each level of construction, particularly for Ptyr electrodeposition and antibody concentration, to optimize signal and specificity. Scanning electron microscopy, fluorescence microscopy, and on-sensor analysis (HRP conjugated enhanced chemiluminescence-based semiquantitative method) to detect Ptyr surface amine and bound antibody were performed as supporting techniques. Cumulative and single shot incubations had shown detection range of 100 to 105 cells per 10 μL and 100 to 104 cells per 10 μL of bacteria in PBS, respectively. Sensors were also able to specifically detect S. pyogenes in 50% (v/v) human saliva, with good selectivity and low cross-reactivity." @default.
• W2334410799 created "2016-06-24" @default.
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• W2334410799 date "2013-11-27" @default.
• W2334410799 modified "2023-09-27" @default.
• W2334410799 title "Novel Impedimetric Immunosensor for Detection of Pathogenic Bacteria <i>Streptococcus pyogenes</i> in Human Saliva" @default.
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• W2334410799 doi "https://doi.org/10.1021/ac403253j" @default.
• W2334410799 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24256123" @default.
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