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3 protocols using butvar solution b 98

1

Structural Analysis of CF-H-AuNPs and CF-H-PtMPs

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A Scanning Electron Microscope (SEM-microanalyser REMMA-102-02, Sumy) was used for structural and morphological analysis of the CF-H-AuNPs and CF-H-PtMPs. The micro/nanocomposites were immersed in a Butvar solution B-98 (Sigma-Aldrich) in 1.5% chloroform and ultrasonicated. All the used parameters, WD—distance from the last lens of a microscope to the samples (mm); kV—accelerating voltage; х—magnification fold; and scale unit (μm), are indicated in the corresponding SEM microphotographs.
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2

Enzyme-Linked Immunosorbent Assay (ELISA) Protocol

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Horseradish peroxidase (HRP) (EC 1.11.1.7, from Armoracia rusticana, 500 U·mg−1), tetrachloroauric acid trihydrate, sodium salt of ABTS, sodium citrate, N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC), pentafluorophenol (PFP), 2-(2-aminoethoxy) ethanol (AEE), dimethylformamide (DMF), N,N-diisopropylethylamine (DIPEA), 16-mercaptohexadecanoic acid (MHDA), methylamine (MA), dimethylamine (DMA), trimethylamine (TMA), NaCl, KH2PO4, Na2HPO4, chloroform, and Butvar solution B-98 were purchased from Sigma-Aldrich (ALSI Ltd., Kiev, Ukraine). The cathodic electrodeposition paint “GY 83–0270 0005” was from BASF Farben und Lacke (Munster, Germany). All buffers and standard solutions were prepared using the water purified by the Milli-Q system (Millipore).
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3

Scanning Electron Microscopy of Electrode Surfaces

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A scanning electron microscope (SEM-microanalyser REMMA-102-02, Sumy, Ukraine) was used for morphological characterization of the electrodes’ planar surfaces. A special cover film was formed on the samples with a Butvar solution B-98 (Sigma, St. Louis, MO, USA) in 1.5% chloroform using an ultrasound method. The distance from the last lens of the microscope to the sample (WD) ranged from 17.1 to 21.7 mm. The accelerator voltage was in the range from 20 to 40 kV. Zooms were from 2500× to 10,000×.
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