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Human Factor X ELISA Kit

1. at 1 2 in MIX Diluent and assay however the user should determine the optimal dilution factor The undiluted samples can be stored at 20 C or below for up to 3 months Avoid repeated freeze thaw cycles e Urine Collect urine using sample tube Centrifuge samples at 800 x g for 10 minutes and assay Store samples at 20 C or below for up to 3 months Avoid repeated freeze thaw cycles e Saliva Collect saliva using sample tube Centrifuge samples at 800 x g for 10 minutes and assay Store samples at 20 C or below for up to 3 months Avoid repeated freeze thaw cycles e CSF Collect cerebrospinal fluid CSF using sample tube Centrifuge samples at 3000 x g for 10 minutes and assay The undiluted samples can be stored at 80 C for up to 3 months Avoid repeated freeze thaw cycles Refer to Sample Dilution Guidelines below for further instruction Guidelines for Dilutions of 1 100 or Greater for reference only please follow the insert for specific dilution suggested 1 100 1 10000 A 4 ul sample 396 ul buffer 100x 100 fold dilution Assuming the needed volume is less than or equal to 400 ul 4 ul sample 396 ul buffer 100x 4 ul of A 396 ul buffer 100x 10000 fold dilution Assuming the needed volume is less than or equal to 400 ul 1 1000 1 100000 4 ul sample 396 ul buffer 100x 24 ul of A 216 ul buffer 10x 1000 fold dilution Assuming the needed volume is less than or equal to 2
2. determined by testing three plasma samples in twenty assays Intra Assay Precision Inter Assay Precision Sample 1 2 3 1 2 3 n 20 20 20 20 20 20 CV Average CV Spiking Recovery e _ Recovery was determined by spiking two plasma samples with different factor X concentrations Unspiked Sample ng ml Spike Recovery ng ml 5 0 11 2 10 8 96 6 2 15 0 21 2 20 1 95 25 0 31 2 28 3 91 5 0 17 3 19 4 112 15 0 27 3 26 8 98 25 0 37 3 35 6 95 Average Recovery 98 Expected Observed Linearity e Plasma and serum samples were serially diluted to test for linearity Average Percentage of Expected Value Sample Dilution Plasma Serum 1 400 107 105 1 800 98 101 1 1600 101 96 10 Cross Reactivity Species Cross Reactivity Canine None Bovine None Monkey None Mouse None Rat None Swine None Rabbit None Proteins Cross Reactivity Human Factor X 100 Human Factor Xa Troubleshooting 100 Issue Causes Course of Action Use of expired e Check the expiration date listed before use components e Do not interchange components from different lots e Check that the correct wash buffer is being used e Check that all wells are dry after aspiration Improper wash step e Check that the microplate was
3. 40 ul Reagent Preparation 4 ul sample 396 ul buffer 100x 4 ul of A 396 ul buffer 100x 24 ul of B 216 ul buffer 10x 100000 fold dilution Assuming the needed volume is less than or equal to 240 ul 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 1 10 with reagent grade water Store for up to 30 days at 2 8 C Standard Curve Reconstitute the 400 ng 48 mU ml of Human Factor X Standard with 2 ml of MIX Diluent to generate a 200 ng ml 24 mU 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 diluting the standard stock solution 200 ng ml 24 mU ml 1 2 with MIX Diluent to generate 100 50 25 12 5 6 25 3 125 and 1 563 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 wa FX Point Dilution ng ml 1 part Standard 200 ng ml PE 1 part MIX Diluent 100 0 1 part P1 1 part MIX Diluent 50 00 600 1 part P2 1 part MIX Diluent 25 00 Pa 1partP3 1 part MIX Diluent 1250 150 Ps 1partP5 1 part MIX Diluent 3 125 0375 ls MiXDiluent_ 0 000 0 000 e Bi
4. an active enzyme FXa FXa as the activator of prothrombin occupies a central position linking the two blood coagulation pathways 1 4 Principle of the Assay The AssayMax Human Factor X ELISA Enzyme Linked Immunosorbent Assay kit is designed for detection of human factor X in plasma serum milk urine saliva CSF and cell culture samples This assay employs a quantitative sandwich enzyme immunoassay technique that measures FX in less than 4 hours A monoclonal antibody specific for FX has been pre coated onto a 96 well microplate with removable strips FX in standards and samples is sandwiched by the immobilized antibody and biotinylated polyclonal antibody specific for FX 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 Sto
5. e stored for up to 30 daysina vacuum desiccator e Diluent 1x may be stored for up to 30 days at 2 8 C e Store Standard at 2 8 C before reconstituting with Diluent and at 20 C after reconstituting with Diluent Other Supplies Required e Microplate reader capable of measuring absorbance at 450 nm e Pipettes 1 20 ul 20 200 ul 200 1000 ul and multiple channel e Deionized or distilled reagent grade water Sample Collection Preparation and Storage e Plasma Collect plasma using one tenth of 0 1 M sodium citrate as an anticoagulant Centrifuge samples at 3000 x g for 10 minutes and use supernatants Dilute samples 1 800 into MIX Diluent and assay The undiluted samples can be stored 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 and remove serum Dilute samples 1 800 into MIX Diluent and assay The undiluted samples can be stored 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 samples at 20 C or below Avoid repeated freeze thaw cycles e Milk Collect milk using sample tube Centrifuge samples at 800 x g for 10 minutes Milk dilution is suggested
6. her is dispensing properly e If washing by pipette check for proper pipetting technique o Splashing of reagents e Pipette properly in a controlled and careful manner 8 while loading wells 2 i e Pipette properly in a controlled and careful manner a Inconsistent volumes y ee e Check pipette calibration 3 loaded into wells i o e Check pipette for proper performance Insufficient mixing of reagent dilutions e Thoroughly agitate the lyophilized components after reconstitution e Thoroughly mix dilutions Improperly sealed microplate e Check the microplate pouch for proper sealing e Check that the microplate pouch has no punctures e Check that three desiccants are inside the microplate pouch prior to sealing Unexpectedly Low or High Signal Intensity Microplate was left unattended between steps e Each step of the procedure should be performed uninterrupted Omission of step e Consult the provided procedure for complete list of steps Steps performed in incorrect order e Consult the provided procedure for the correct order Insufficient amount of reagents added to wells e Check pipette calibration e Check pipette for proper performance Wash step was skipped e Consult the provided procedure for all wash steps Improper wash buffer e Check that the correct wash buffer is being used Improper reagent preparation e Consult reagent preparation secti
7. man Factor X ELISA Kit with Positive and Negative Controls Plasma Serum Urine Milk Saliva Cell Culture and CSF samples www assaypro com e mail support assaypro com 11
8. on for the correct dilutions of all reagents Insufficient or prolonged incubation periods e Consult the provided procedure for correct incubation time Deficient Standard Curve Fit Non optimal sample dilution e Sandwich ELISA If samples generate OD values higher than the highest standard point P1 dilute samples further and repeat the assay e Competitive ELISA If samples generate OD values lower than the highest standard point P1 dilute samples further and repeat the assay e User should determine the optimal dilution factor for samples Contamination of e A new tip must be used for each addition of different reagents samples or reagents during the assay procedure Contents of wells e Verify that the sealing film is firmly in place before placing evaporate the assay in the incubator or at room temperature Improper pipetting e Pipette properly in a controlled and careful manner e Check pipette calibration e Check pipette for proper performance Insufficient mixing of reagent dilutions e Thoroughly agitate the lyophilized components after reconstitution e Thoroughly mix dilutions References 1 Ruf W and Edgington T S 1994 FASEB J 8 385 2 Neuenschwander P F et al 1993 Thrombosis and Haemostasis 70 970 3 Messier T L et al 1991 Gene 99 291 4 DiScipio R G et al 1977 Biochemistry 16 5253 Version 5 3R Related Products e EF1010 7 AssayMax Hu
9. otinylated Human Factor X Antibody 60x Spin down the antibody briefly and dilute the desired amount of the antibody 1 60 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 the 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 instructed 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 Human Factor X 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 remo
10. own sample concentration from the Standard Curve and multiply the value by the dilution factor Typical Data The typical data is provided for reference only Individual laboratory means may vary from the values listed Variations between laboratories may be caused by technique differences Standard Point Average OD P1 100 0 P2 50 00 P3 25 00 P4 12 50 PS 6 250 P6 3 125 P7 1 563 P8 0 000 Sample Pool Normal Sodium Citrate Plasma 800x Standard Curve e The curve is used for illustration only A standard curve should be generated each time the assay is performed Human FX Standard Curve OD 450 nm 0 1 L 1 0 10 0 100 0 f X ng ml Human FX Standard Curve OD 450 nm 0 1 tr 1 r r l po iil po iii 0 1 1 0 10 0 100 0 f X mU ml Reference Value e Normal human factor X plasma levels range from 3 to 13 ug ml e Human plasma and serum samples from healthy adults were tested n 40 On average factor X level was 8490 ng ml Sample Average Value ng ml Human Pool Normal Plasma 7926 Human Normal Plasma 8124 Human Pool Normal Serum 9421 Performance Characteristics e The minimum detectable dose of factor X as calculated by 25D from the mean of a zero standard was established to be 0 4 ng ml e Intra assay precision was determined by testing replicates of three plasma samples in one assay e inter assay precision was
11. p Solution is an acidic solution e The kit should not be used beyond the expiration date Reagents e Human Factor X Microplate A 96 well polystyrene microplate 12 strips of 8 wells coated with a monoclonal antibody against human FX e Sealing Tapes Each kit contains 3 precut pressure sensitive sealing tapes that can be cut to fit the format of the individual assay e Human Factor X Standard Human FX in a buffered protein base 400 ng lyophilized e Biotinylated Human Factor X Antibody 60x A 60 fold biotinylated polyclonal antibody against human FX 100 pl e Streptavidin Peroxidase Conjugate SP Conjugate A 100 fold concentrate 80 ul e _ MIX Diluent Concentrate 10x A 10 fold concentrated buffered protein base 30 ml e Wash Buffer Concentrate 20x A 20 fold concentrated buffered surfactant 30 ml 2 bottles e Chromogen Substrate A ready to use stabilized peroxidase chromogen substrate tetramethylbenzidine 8 ml e Stop Solution A 0 5 N hydrochloric acid to stop the chromogen substrate reaction 12 ml Storage Condition e Upon arrival immediately store components of the kit at recommended temperatures up to the expiration date e Store SP Conjugate and Biotinylated Antibody at 20 C e Store Microplate Diluent Concentrate 10x Wash Buffer Stop Solution and Chromogen Substrate at 2 8 C e Unused microplate wells may be returned to the foil pouch with the desiccant packs and resealed May b
12. ve the liquid e Add 50 ul of Biotinylated Human Factor X Antibody to each well and incubate for 1 hour 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 Wash the microplate as described above Add 50 ul of Chromogen Substrate per well and incubate for 10 minutes or till the optimal blue color density develop Gently tap the plate to ensure thorough mixing and break the bubbles in the well with pipette tip Add 50 ul of Stop Solution to each well The color will change from blue to yellow 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 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 unkn
13. yssarpro AssayMax Human Factor X 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 1 hour 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 10 minutes Step 5 Add 50 ul of Stop Solution per well Read at 450 nm immediately Symbol Key BE Consult instructions for use Assay Template 12 11 10 Human Factor X ELISA Kit Catalog No EF1010 1 Sample insert for reference use only Introduction Factor X FX is a plasma serine protease zymogen involved in the blood coagulation cascade FX is purified from plasma as a two chain protein consisting of a 45 kDa heavy chain and a 17 kDa light chain The FX heavy chain is cleaved during coagulation by several different proteases including the intrinsic Xase complex the FX activating enzyme from Russell s viper venom RVV and trypsin and also by extrinsic tissue factor factor Vila pathway to give

Human Factor X ELISA Kit

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