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2 protocols using sodium azide

1

Multiplex Mycotoxin Detection Assay

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Methanol and acetonitrile (HPLC grade) were purchased from Merck Drugs and Biotechnology (New York, NY, USA). AFB1, AFB2, AFG1, AFG2, OTA, zearalenone (ZEN), trichothecenes (T2), deoxynivalenol (DON), fumonisins (FB) standard solutions, goat anti-mouse IgG, bovine serum albumin (BSA), and ovalbumin (OVA) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Sodium borate decahydrate, potassium carbonate, sucrose, Tween-20, acetic acid, sodium azide, sodium chloride, sodium hydrogen phosphate, potassium dihydrogen phosphate, potassium chloride, hydrochloric acid, and sodium bicarbonate were purchased from Damao Chemical Reagent Factory (Tianjin, China). Colloidal gold (particle size ~60 mm) and AFB1/OTA monoclonal antibody were purchased from Clover Technology Group Inc. (Beijing, China).
The following reagents were used: PBS; boric acid buffer solution (0.2 mol/L); resuspension solution, gold label pad treatment solution, sample pad treatment solution, sample buffer [23 (link)].
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2

Phenotypic Analysis of RAW264.7 Macrophages

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RAW264.7 cells (2x106 cells/ml) were cultured for 24 h in the presence of SHP (100 µg/ml) or LPS (1 µg/ml); cells treated with RPMI were used as the negative control group and LPS as the positive control group. Subsequently, cells were harvested and washed with FACS buffer containing 1% bovine serum albumin and 0.1% sodium azide (Damao Chemical Reagent Factory). Cells were then stained with 10 µg/ml anti-mouse CD40 conjugated with APC (cat. no. ab272271) and CD11b conjugated with FITC (cat. no. ab24874) (both from Abcam) for 30 min at 4˚C Parallel sets of cells were incubated without the antibodies and their autofluorescence intensity served as a non-specific negative control. A total of 100,000 viable cells per treatment (as determined using light scatter profiles) were analyzed using a FACS Symphony A5 flow cytometer (BD Biosciences) and CytExpert cytometry software (version 1.0) (Beckman Coulter, Inc.).
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