AssayMaxTM Mouse Leptin ELISA Kit
Contents
1. e 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 Data Analysis e Calculate the mean value of the duplicate or triplicate readings for each standard and sample e To generate a standard curve plot the graph using the standard concentrations on the x axis and the corresponding mean 450 nm absorbance on the y axis The best fit line can be determined by regression analysis using log log or four parameter logistic curve fit e Determine the unknown sample concentration from the Standard Curve and multiply the value by the dilution factor Standard Curve e The curve is provided for illustration only A standard curve should be generated each time the assay is performed Mouse Leptin Standard Curve 10 0r OD 450 nm gt 0 1 10 10 0 100 0 mLeptin ng ml Performance Characteristics e The minimum detectable level of mouse leptin is typically 0 3 ng ml Intra assay and inter assay coefficients of variation were 4 6 and 7 1 respectively Cross Reactivity Species Cross Reactivity Canine None Bovine None Monkey None Mou2. A 96 well polystyrene microplate 12 strips of 8 wells coated with a polyclonal antibody against mouse leptin Sealing Tapes Each kit contains 3 precut pressure sensitive sealing tapes that can be cut to fit the format of the individual assay Mouse Leptin Standard Mouse leptin in a buffered protein base 96 ng lyophilized Biotinylated Mouse Leptin Antibody 50x A 50 fold concentrated biotinylated polyclonal antibody against mouse leptin 110 ul 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 Streptavidin Peroxidase Conjugate SP Conjugate A 100 fold concentrate 80 ul Chromogen Substrate A ready to use stabilized peroxidase chromogen substrate tetramethylbenzidine 8 ml Stop Solution A 0 5 N hydrochloric acid to stop the chromogen substrate reaction 12 ml Storage Condition 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 daysina vacuum desiccator Diluent 1x may be stored for up to 30 days at 2 8 C Store Standard at 2 8 C before recon
3. A assarbno AssayMax Mouse Leptin ELISA Kit Assaypro LLC 3400 Harry S Truman Blvd St Charles MO 63301 T 636 447 9175 F 636 395 7419 WWW assaypro com For any questions regarding troubleshooting or performing the assay please contact our support team at support assaypro com Thank you for choosing Assaypro Assay Summary Step 1 Add 50 ul of Standard or Sample per well Incubate 2 hours Step 2 Wash then add 50 ul of Biotinylated Antibody per well Incubate 2 hours Step 3 Wash then add 50 ul of SP Conjugate per well Incubate 30 minutes Step 4 Wash then add 50 ul of Chromogen Substrate per well Incubate 20 minutes Step 5 Add 50 ul of Stop Solution per well Read at 450 nm immediately Symbol Key ci Consult instructions for use Assay Template 12 11 10 Mouse Leptin ELISA Kit Catalog No EML2001 1 Sample insert for reference use only Introduction Leptin a 16 kDa protein secreted from white adipocytes has been implicated in the regulation of food intake energy expenditure and whole body energy balance in rodents and humans 1 The plasma insulin response appears more closely associated with the plasma leptin concentration 2 Neonatal leptin levels are strongly associated with female gender birth length and formula feeding 3 Leptin concentrations were higher in women than in men 4 Pri
4. ard Curve Reconstitute the 96 ng of Mouse Leptin Standard with 4 ml of MIX Diluent to generate a 24 ng ml standard stock solution Allow the standard to sit for 10 minutes with gentle agitation prior to making dilutions Prepare duplicate or triplicate standard points by serially diluting the standard stock solution 24 ng ml 1 2 with MIX Diluent to produce 12 6 3 1 5 0 75 and 0 375 ng ml solutions MIX Diluent serves as the zero standard 0 ng ml Any remaining solution should be frozen at 20 C and used within 30 days Standard Point Dilution Mouse Leptin ng ml P1 1 part Standard 24 ng ml 24 00 1 part P1 1 part MIX Diluent 12 00 1 part P2 1 part MIX Diluent 6 000 P4 1part P3 1 part MIX Diluent 3 000 Ps ipartPS 1partMiXDiluent 0750 P8 MiDiuent 000 e Biotinylated Mouse Leptin Antibody 50x Spin down the antibody briefly and dilute the desired amount of the antibody 1 50 with MIX Diluent Any remaining solution should be frozen at 20 C e Wash Buffer Concentrate 20x If crystals have formed in the concentrate mix gently until the crystals have completely dissolved Dilute Wash Buffer Concentrate 1 20 with reagent grade water e SP Conjugate 100x Spin down the SP Conjugate briefly and dilute the desired amount of the conjugate 1 100 with MIX Diluent Any remaining solution should be frozen at 20 C Assay Procedure e Prepare all reagents standard solutions and samples as instr
5. nciple of the Assay The AssayMax Mouse Leptin ELISA Enzyme Linked Immunosorbent Assay kit is designed for detection of mouse leptin in plasma serum and cell culture samples This assay employs a quantitative sandwich enzyme immunoassay technique that measures mouse leptin in less than 5 hours A polyclonal antibody specific for mouse leptin has been pre coated onto a 96 well microplate with removable strips Mouse leptin in standards and samples is sandwiched by the immobilized antibody and a biotinylated polyclonal antibody specific for mouse leptin which is recognized by a streptavidin peroxidase 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 Caution and Warning e This product is for Research Use Only and is Not For Use In Diagnostic Procedures Prepare all reagents working diluent buffer wash buffer standard biotinylated antibody and SP conjugate as instructed prior to running the assay e 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 e Spin down the SP conjugate vial and the biotinylated antibody vial before opening and using contents e The Stop Solution is an acidic solution e The kit should not be used beyond the expiration date Reagents Mouse Leptin Microplate
6. se 100 Rat lt 20 Human lt 20 Rabbit None References 1 2 3 4 Houseknecht KL et al 1998 J Anim Sci 76 5 1405 20 Abbasi F et al 2000 Metabolism 49 4 544 7 Petridou E et al 2005 Clin Endocrinol Oxf 62 3 366 71 Wallerstedt SM et al 2004 Blood Press 13 4 243 6 Version 2 7R1 www assaypro com e e mail Support assaypro com
7. stituting with Diluent and at 20 C after reconstituting with Diluent Other Supplies Required Microplate reader capable of measuring absorbance at 450 nm Pipettes 1 20 ul 20 200 ul 200 1000 ul and multiple channel Deionized or distilled reagent grade water Sample Collection Preparation and Storage e Plasma Collect plasma using one tenth volume of 0 1 M sodium citrate as an anticoagulant Centrifuge samples at 3000 x g for 10 minutes and assay Store the remaining samples at 20 C or below for up to 3 months Avoid repeated freeze thaw cycles EDTA or Heparin can also be used as an anticoagulant e Serum Samples should be collected into a serum separator tube After clot formation centrifuge samples at 3000 x g for 10 minutes Remove serum and assay Store the remaining serum at 20 C or below for up to 3 months Avoid repeated freeze thaw cycles e Cell Culture Supernatants Centrifuge cell culture media at 3000 x g for 10 minutes to remove debris Collect supernatants and assay Store the remaining samples at 20 C or below for up to 3 months Avoid repeated freeze thaw cycles Reagent Preparation e Freshly dilute all reagents and bring all reagents to room temperature before use e MIX Diluent Concentrate 10x If crystals have formed in the concentrate mix gently until the crystals have completely dissolved Dilute MIX Diluent Concentrate 1 10 with reagent grade water Store for up to 30 days at 2 8 C e Stand
8. ucted Bring all reagents to room temperature before use The assay is performed at room temperature 20 25 C e 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 e Add 50 ul of Mouse Leptin Standard or sample per well Cover wells and incubate for 2 hours Start the timer after the last addition e Wash five times with 200 ul 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 300 ul of Wash Buffer and then invert the plate decanting the contents hit 4 5 times on absorbent material to completely remove the liquid e Add 50 ul of Biotinylated Mouse Leptin Antibody to each well and incubate for 2 hours e Wash the microplate as described above e Add 50 ul of Streptavidin Peroxidase Conjugate per well and incubate for 30 minutes Turn on the microplate reader and set up the program in advance e Wash the microplate as described above e Add 50 ul of Chromogen Substrate per well and incubate for 20 minutes or till the optimal blue color density develops Gently tap the plate to ensure thorough mixing and break the bubbles in the well with pipette tip e Add 50 ul of Stop Solution to each well The color will change from blue to yellow
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