Cathepsin S (CTSS) BioAssay(TM) ELISA Kit (Human)

Product Overview

• Article Name: Cathepsin S (CTSS) BioAssay(TM) ELISA Kit (Human)
• Biozol Catalog Number: USB-024021
• Supplier Catalog Number: 024021
• Alternative Catalog Number: USB-024021-48,USB-024021-96
• Manufacturer: US Biological
• Category: Kits/Assays

Product Description

The Human Cathepsin S (CTSS) ELISA Kit is a sandwich enzyme immunoassay for the in vitro quantitative measurement of CTSS in human serum, plasma, tissue homogenates and other biological fluids. Detection Range: 0.156-10ng/ml Sensitivity: <0.072ng/ml Precision: Intra-Assay: CV<10% Inter-Assay: CV<12% Test Principle: The microtiter plate provided in this kit has been pre-coated with an antibody specific to CTSS. Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody specific to CTSS. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain CTSS, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulfuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm 10nm. The concentration of CTSS in the sample is then determined by comparing the O.D. of the sample to the standard curve. Kit Components: *024021A: Microtiter Plate, 1x96 wells, Pre-coated, ready to use *024021B: Standard, 2x1vial 024021C: Standard Diluent, 1x20ml *024021D: Detection Reagent A, 1x120ul *024021E: Detection Reagent B, 1x120ul 024021F: Assay Diluent A, 1x12ml 024021G: Assay Diluent B, 1x12ml 024021H: TMB Substrate, 1x9ml 024021K: Stop Solution, 1x6ml 024021L: Wash Buffer, 30X, 1x20ml Storage and Stability: Store *024021A, *024021B, *024021D and *024021E at -20C. Store all the other components at 4C. Unused kit is stable for 6 months. Once kit components are opened, it is highly recommended to use remaining reagents within 1 month provided this is within the expiration date of the kit. For maximum recovery of product, centrifuge the original vials after thawing and prior to removing the cap. Materials Required But Not Supplied: 1. Microplate reader with 450 10nm filter. 2. Precision single or multi-channel pipettes and disposable tips. 3. Eppendorf Tubes for diluting samples. 4. Deionized or distilled water. 5. Absorbent paper for blotting the microtiter plate. 6. Container for Wash Solution Sample Preparation and Storage: Serum: Use a serum separator and allow samples to clot for two hours at room temperature or overnight at 4C before centrifugation for 20 minutes at approximately 1000xg. Assay freshly prepared serum immediately or store samples in aliquots at -20C or -80C for later use. Avoid repeated freeze/thaw cycles. Plasma: Collect plasma using EDTA or heparin as anticoagulant. Centrifuge samples for 15 minutes at 1000xg at 2-8C within 30 minutes of collection. Remove plasma and assay immediately or store samples in aliquots at -20C or -80C for later use. Avoid repeated freeze/thaw cycles. Note: Serum/plasma samples require about 5-fold dilution (example: 40ul sample + 160ul PBS). Samples should be diluted using 0.01M PBS, pH 7.0-7.2. Tissue Homogenates: The preparation of tissue homogenates will vary depending upon tissue type. For this assay, tissues were rinsed thoroughly in ice-cold PBS (0.02M pH 7.0-7.2) to remove excess blood and weighed before homogenization. The tissues were minced to small pieces and homogenized in 5-10ml of PBS with a glass homogenizer on ice (Micro Tissue Grinders works too). The resulting suspension was sonicated with an ultrasonic cell disrupter or subjected to two freeze-thaw cycles to further break the cell membranes. After that, the homogenates were centrifuged for 5 minutes at 2500*g. The supernatant was removed and assayed immediately or aliquoted and stored at -20C or lower. Other Biological Fluids: Centrifuge samples for 20 minutes at 1000*g. Remove particulates and assay immediately or store samples in aliquots at -20C or -80C. Avoid repeated freeze/thaw cycles. Note: 1. Samples to be used within 5 days may be stored at 4C, otherwise samples must be stored at -20C (1 month) or -80C (2 mon