| Field | Specification |
|---|---|
| Mfr No | |
| Alternative Names | RP11-618A20.5; 26RFa; MGC119794; P518; P518 precursor protein|RF(Arg-Phe)amide family 26 amino acid peptide|RF(Arg-Phe)amide family 26 amino acid peptide (P518) |
| Product Type | |
| Sensitivity | |
| UniProt # |
Scientific Background
P518 functions as a high-affinity ligand of GPR103. Both GPR103 and P518 precursor mRNA exhibited highest expression in brain.The 43-amino acid QRFP peptide, a longer form of the P518 peptide is necessary to exhibit full agonistic activity with GPR103. Intravenous administration QRFP caused release of aldosterone, suggesting that QRFP and GPR103 regulate adrenal function.The deduced 126-amino acid protein contains a putative N-terminal 22-amino acid signal peptide and no transmembrane domain, suggesting that the protein or cleavage products can be secreted. The 26-amino acid P518 peptide seque.
Assay Principle
This assay employs a two-site sandwich ELISA to quantitate QRFP in samples. An antibody specific for QRFP has been pre-coated onto a microplate. Standards and samples are pipetted into the wells and anyQRFP present is bound by the immobilized antibody. After removing any unbound substances, a biotin-conjugated antibody specific for QRFP is added to the wells. After washing, Streptavidin conjugated Horseradish Peroxidase (HRP) is added to the wells. Following a wash to remove any unbound avidin-enzyme reagent, a substrate solution is added to the wells and color develops in proportion to the amount of QRFP bound in the initial step. The color development is stopped and the intensity of the color is measured.
Performance Specifications
| Sensitivity | Request Information |
|---|---|
| Detection Range | Request Information |
| Total Assay Time | 3.5–5 hours |
| Compatible Sample Types | serum, plasma, cell culture supernatant, tissue homogenate |
| Species Reactivity | Mouse |
| Detection Method | Colorimetric (TMB/HRP) |
| Storage | 4°C (short-term); -20°C (long-term) |
✓ Research-Grade Validation
Safety & Regulatory
Handle reagents in accordance with institutional biosafety guidelines. Refer to the Safety Data Sheet (SDS) for complete hazard and handling information. Contains components that may require special disposal procedures per local regulations.
This kit is validated for use with serum, plasma, cell culture supernatant, tissue homogenate. For unlisted matrices (e.g., tissue lysate, urine), perform a spike-and-recovery experiment to confirm assay performance before generating reportable data. Sample dilution in the kit's provided diluent is recommended to minimize matrix interference.
The minimum detectable concentration (sensitivity) of this kit is Request Information. Values below this threshold should be reported as below the limit of detection (<LOD) and should not be extrapolated from the standard curve.
The total assay time from sample addition to absorbance reading is approximately 3.5–5 hours, including all incubation, wash, and substrate steps. Hands-on time is typically 1–2 hours; most steps involve passive plate incubation. Plan the assay as a single uninterrupted session for best results.
Standard components of this Sandwich ELISA Kit typically include: pre-coated microplate (96-well strip format), lyophilized or liquid recombinant QRFP standard, detection antibody, streptavidin-HRP conjugate, TMB substrate, stop solution, wash buffer concentrate, and sample/standard diluent. Refer to the kit insert or datasheet for the exact component list and storage requirements.
This kit uses colorimetric (TMB/HRP) detection and requires a standard microplate absorbance reader capable of measuring at 450 nm. A reference wavelength of 570 nm or 630 nm is recommended to reduce background. No specialized fluorescence or luminescence reader is needed. Ensure the instrument is calibrated and the plate is clean and free of condensation before reading.
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