BNP32 ELISA Kit

Catalog No. ABIN612769

Product Details BNP32 ELISA Kit

Target: BNP32 (BNP 32) (Brain Natriuretic Peptide 32 (BNP 32))

Reactivity: Rat

Detection Method: Colorimetric

Method Type: Sandwich ELISA

Detection Range: 0.031-2 ng/mL

Minimum Detection Limit: 0.031 ng/mL

Application: ELISA

Purpose: The AssayMax™ Rat BNP-32 ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for detection of BNP-32 in rat plasma, serum, tissue extract, and cell culture samples. This assay employs a quantitative sandwich enzyme immunoassay technique that measures rat BNP-32 in approximately 5 hours. A polyclonal antibody specific for rat BNP-32 has been pre-coated onto a 96- well microplate with removable strips. BNP-32 in standards and samples is sandwiched by the immobilized antibody and a biotinylated polyclonal antibody specific for rat BNP-32, which is recognized by a streptavidin- peroxidase (SP) conjugate. All unbound material is washed away and a peroxidase enzyme substrate is added. The color development is stopped and the intensity of the color is measured.

Brand: AssayMax™

Sample Type: Cell Culture Cells, Plasma, Serum, Tissue Lysate

Analytical Method: Quantitative

Components: Rat BNP-32 Microplate: A 96-well polystyrene microplate (12 strips of 8 wells) coated with a polyclonal antibody against rat BNP-32. 2 Sealing Tapes: Each kit contains 3 precut, pressure sensitive sealing tapes that can be cut to fit the format of the individual assay. Rat BNP-32 Standard: Rat BNP-32 in a buffered protein base (10 ng, lyophilized). Biotinylated Rat BNP-32 Antibody (50x): A 50-fold concentrated biotinylated polyclonal antibody against rat BNP-32 (120 l). MIX Diluent Concentrate (10x): A 10-fold concentrated buffered protein base (30 ml). Wash Buffer Concentrate (20x): A 20-fold concentrated buffered surfactant (30 ml, 2 bottles). SP Conjugate (100x): A 100-fold concentrate (80 l). Chromogen Substrate (1x): A stabilized peroxidase chromogen substrate tetramethylbenzidine (8 ml). Stop Solution (1x): A 0.5 N hydrochloric acid solution to stop the chromogen substrate reaction (12 ml).

Material not included: Microplate reader capable of measuring absorbance at 405 nm. Pipettes (1-20 µL, 20-200 µL, and multiple channel). Deionized or distilled reagent grade water. Incubator (37 °C)

Application Details

Sample Volume: 50 μL

Assay Time: 5 h

Plate: Pre-coated

Protocol:

• Step 1. Add 50 μL of Standard or Sample per well. Incubate 2 hours.
• Step 2. Wash, then add 50 μL of Biotinylated Antibody per well. Incubate 2 hours.
• Step 3. Wash, then add 50 μL of SP Conjugate per well. Incubate 30 minutes.
• Step 4. Wash, then add 50 μL of Chromogen Substrate per well. Incubate 8 minutes.
• Step 5. Add 50 μL of Stop Solution per well. Read at 450 nm immediately.

Reagent Preparation:

Freshly dilute all reagents and bring all reagents to room temperature before use. MIX Diluent Concentrate (10x): If crystals have formed in the concentrate, mix gently until the crystals have completely dissolved. Dilute the MIX Diluent Concentrate 10-fold with reagent grade water to produce a 1x solution. Store for up to 30 days at 2-8 °C. Rat BNP-32 Standard: Reconstitute the Rat BNP-32 Standard (10 ng) with 2.5 mL of MIX Diluent to generate a 4 ng/mL standard stock solution. Allow the vial to sit for 10 minutes with gentle agitation prior to making dilutions. Prepare duplicate or triplicate standard points by serially diluting from the standard (4 ng/mL) 2-fold with equal volume of MIX Diluent to produce 2, 1, 0.5, 0.25, 0.125, 0.063, and 0.031 ng/mL 4 solutions. MIX Diluent serves as the zero standard (0 ng/mL). Any remaining stock solution should be stored at -20 °C and used within 30 days. Avoid repeated freeze-thaw cycles. Standard Point Dilution [Rat BNP-32] (ng/mL) P1 1 part Standard (4 ng/mL) + 1 part MIX Diluent 2.0 P2 1 part P1 + 1 part MIX Diluent 1.0 P3 1 part P2 + 1 part MIX Diluent 0.5 P4 1 part P3 + 1 part MIX Diluent 0.25 P5 1 part P4 + 1 part MIX Diluent 0.125 P6 1 part P5 + 1 part MIX Diluent 0.063 P7 1 part P6 + 1 part MIX Diluent 0.031 P8 MIX Diluent 0.0 Biotinylated Rat BNP-32 Antibody (50x): Spin down the antibody briefly and dilute the desired amount of the antibody 50-fold with MIX Diluent to produce a 1x solution. The undiluted antibody should be stored at -20 °C. Wash Buffer Concentrate (20x): If crystals have formed in the concentrate, mix gently until the crystals have completely dissolved. Dilute the Wash Buffer Concentrate 20-fold with reagent grade water to produce a 1x solution. SP Conjugate (100x): Spin down the SP Conjugate briefly and dilute the desired amount of the conjugate 100-fold with MIX Diluent to produce a 1x solution. The undiluted conjugate should be stored at -20 °C.

Sample Collection: Plasma: Collect plasma using a final concentration of 0.1 M sodium citrate as an anticoagulant. Centrifuge samples at 3000 x g for 10 minutes and collect plasma. Use undiluted plasma for medium and high levels of BNP-32. Samples can be stored at -20 °C or below for up to 3 months. Avoid repeated freeze-thaw cycles (EDTA can also be used as an anticoagulant). 3 Serum: Samples should be collected into a serum separator tube. After clot formation, centrifuge samples at 3000 x g for 10 minutes and remove serum. Use undiluted serum for medium and high levels of BNP-32. Samples can be stored at -20 °C or below for up to 3 months. Avoid repeated freeze-thaw cycles. Tissue: Extract tissue samples with 0.1 M phosphate-buffered saline ( pH 7.4) containing 1 % Triton X-100 and centrifuge at 14000 x g for 20 minutes. Collect the supernatant and measure the protein concentration. Store the remaining extract at -20 °C or below. Cell Culture Supernatants: Centrifuge cell culture media at 3000 x g for 10 minutes at 4 °C to remove debris and collect supernatants. Samples can be stored at -20 °C or below. Avoid repeated freeze-thaw cycles.

Assay Procedure:

Prepare all reagents, standard solutions, and samples as instructed. Bring all reagents to room temperature before use. The assay is performed at room temperature (20-25 °C). Remove excess microplate strips from the plate frame and return them immediately to the foil pouch with desiccants inside. Reseal the pouch securely to minimize exposure to water vapor and store in a vacuum desiccator. Add 50 l of Rat BNP-32 Standard or sample to each well. Gently tap plate to thoroughly coat the wells. Break any bubbles that may have formed. Cover wells with a sealing tape and incubate for 2 hours. Start the timer after the last addition. Wash five times with 200 l of Wash Buffer manually. Invert the plate each time and decant the contents, hit 4-5 times on absorbent material to completely remove the liquid. If using a machine, wash six times with 5 300 l of Wash Buffer and then invert the plate, decanting the contents, hit 4-5 times on absorbent material to completely remove the liquid. Add 50 l of Biotinylated Rat BNP-32 Antibody to each well. Gently tap plate to thoroughly coat the wells. Break any bubbles that may have formed. Cover wells with a sealing tape and incubate for 2 hours. Wash the microplate as described above. Add 50 l of SP Conjugate to each well. Gently tap plate to thoroughly coat the wells. Break any bubbles that may have formed. Cover wells with a sealing tape and incubate for 30 minutes. Turn on the microplate reader and set up the program in advance. Wash the microplate as described above. Add 50 l of Chromogen Substrate to each well. Gently tap plate to thoroughly coat the wells. Break any bubbles that may have formed. Incubate for 8 minutes or until the optimal blue color density develops. Add 50 l of Stop Solution to each well. The color will change from blue to yellow. Gently tap plate to ensure thorough mixing. Break any bubbles that may have formed. Read the absorbance on a microplate reader at a wavelength of 450 nm immediately. If wavelength correction is available, subtract readings at 570 nm from those at 450 nm to correct optical imperfections. Otherwise, read the plate at 450 nm only. Please note that some unstable black particles may be generated at high concentration points after stopping the reaction for about 10 minutes, which will reduce the readings.

Calculation of Results:

• Calculate the mean value of the duplicate or triplicate readings for each standard and sample.
• To generate a standard curve, plot the graph using the standard concentrations on the x-axis and the corresponding mean 450 nm absorbance (OD) on the y-axis. The best-fit line can be determined by regression analysis using log-log or four-parameter logistic curve-fit.
• Determine the unknown sample concentration from the standard curve and multiply the value by the dilution factor.

Assay Precision: Intra-assay and inter-assay coefficients of variation were 4.6 % and 7.9% respectively.

Restrictions: For Research Use only

Handling

Handling Advice: This product is for Research Use Only and is not intended for use in diagnostic procedures. Prepare all reagents (diluent buffer, wash buffer, standard, biotinylated antibody, and SP conjugate) as instructed, prior to running the assay. Prepare all samples prior to running the assay. The dilution factors for the samples are suggested in this insert. However, the user should determine the optimal dilution factor. Spin down the SP conjugate vial and the biotinylated antibody vial before opening and using contents. The Stop Solution is an acidic solution. The kit should not be used beyond the expiration date.

Storage: 4 °C/-20 °C

Storage Comment: Upon arrival, immediately store components of the kit at recommended temperatures up to the expiration date. Store SP Conjugate and Biotinylated Antibody at -20°C. Store Microplate, Diluent Concentrate (10x), Wash Buffer, Stop Solution, and Chromogen Substrate at 2-8°C. Unused microplate wells may be returned to the foil pouch with the desiccant packs and resealed. May be stored for up to 30 days in a vacuum desiccator. Diluent (1x) may be stored for up to 30 days at 2-8°C. Store Standard at 2-8°C before reconstituting with Diluent and at -20°C after reconstituting with Diluent.

References for BNP32 ELISA Kit (ABIN612769)

Romaní-Pérez, Outeiriño-Iglesias, Moya, Santisteban, González-Matías, Vigo, Mallo: "Activation of the GLP-1 receptor by liraglutide increases ACE2 expression, reversing right ventricle hypertrophy, and improving the production of SP-A and SP-B in the lungs of type I diabetes rats." in: Endocrinology, pp. en20141685, (2015) (PubMed).

Aritomi, Harada, Sugino, Nishimura, Nakamura, Takahara: "Comparison of the cardioprotective and renoprotective effects of the L/N-type calcium channel blocker, cilnidipine, in adriamycin-treated spontaneously-hypertensive rats." in: Clinical and experimental pharmacology & physiology, Vol. 42, Issue 4, pp. 344-52, (2015) (PubMed).

Target Details for BNP32

Target: BNP32 (BNP 32) (Brain Natriuretic Peptide 32 (BNP 32))

Alternative Name: Brain Natriuretic Peptide 32 (BNP-32) (BNP 32 Products)

Synonyms: BNP ELISA Kit, natriuretic peptide B ELISA Kit, NPPB ELISA Kit

Background: Natriuretic peptides (ANP, BNP, and CNP) comprise a family of structurally related peptides, which are derived from three different genes and share a 17- amino acid internal ring (1).

Gene ID: 25105

UniProt: P13205