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2 protocols using enzyme linked immunosorbent assay elisa plates

1

Joss Fly Ash Biodetection Assay

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A few hundred grams of joss fly ash were collected from a joss paper burning furnace located in a Chinese temple in a northern state of Malaysia. Sodium hydroxide, sulfuric acid, Tween-20, Tris-buffer, (3-aminopropyl)triethoxysilane (APTES), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC), and N-hydroxysuccinimide (NHS) were procured from Sigma Aldrich (USA). Enzyme-linked immunosorbent assay (ELISA) plates and horseradish peroxidase (HRP)-conjugated streptavidin were purchased from Thermo Scientific (USA). An ELASA coating buffer (5×) was procured from Biolegend (Japan). Bovine serum albumin (BSA) and 3,3′,5,5′-tetramethylbenzidine (TMB) were procured from Promega (USA). Biotinylated ampicillin aptamer with an ssDNA sequence of 5′-CACGGCATGGTGGGCGTCGTG-3′ was synthesized from a local supplier (Apical Scientific, Malaysia). The Escherichia coli and Bacillus subtilis strains were obtained from the School of Bioprocess Engineering, University Malaysia Perlis. A sterile disc was purchased from HiMedia Laboratories Pvt. Ltd. (Mumbai, India).
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2

SARS-CoV-2 Spike Protein Immunosensor Development

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A 10-µm gap-sized gold interdigitated electrode (AuIDE) with 125 electrode fingers connected by pads was purchased from Metrohm DropSens (Malaysia). His-tagged recombinant SARS-CoV-2 SP (native sequence: YP_009724390) produced in HEK293 cells was purchased from InvivoGen (China). Anti-SP antibody produced in mice was purchased from GeneTex, Inc. (North America). The recombinant SARS-CoV-2 nucleocapsid protein (NCP) and hemagglutinin (HA) of human influenza A for specificity determination of the immunosensor were procured from GeneTex, Inc. (North America) and Sino Biological Inc. (China), respectively. Diamond nanopowder was purchased from Sigma-Aldrich (USA). Phosphate-buffered saline (PBS, 1 M, pH 7.4), potassium hydroxide (KOH), 99% ethanol, 1,1′-carbonyldiimidazole (CDI), (3-glycidyloxypropyl)trimethoxysilane (GOPTS), potassium hexacyanoferrate (III), K3[Fe(CN)6] potassium hexacyanoferrate (II), and K4[Fe(CN)6] were procured from Sigma-Aldrich (USA). Ethanolamine (ETA) obtained from Fisher Scientific (UK) was used as a blocking agent. Enzyme-linked immunosorbent assay (ELISA) plates and anti-mouse IgG horseradish peroxidase (HRP) were procured from Thermo Scientific (USA). ELISA coating buffer (5 ×) was purchased from Biolegend (Japan). 3,3′,5,5′-tetramethylbenzidine (TMB) and bovine serum albumin (BSA) were purchased from Promega (USA).
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