Human vanillyl mandelic acid（VMA） ELISA Kit
Store all reagents at 2-8°C Collect sample: serum or blood plasma Assay range ： 1.5 U/L -350U/L
FOR LABORATORY RESEARCH USE ONLY.
NOT FOR THERAPEUTIC OR DIAGNOSTIC APPLICATIONS! PLEASE READ THROUGH ENTIRE PROCEDURE BEFORE BEGINNING!
This VMA ELISA kit is intended Laboratory for Research use only and is not for use in diagnostic or therapeutic procedures.The Stop Solution changes the color from blue to yellow and the intensity of the color is measured at 450 nm using a spectrophotometer. In order to measure the concentration of VMA in the sample, this VMA ELISA Kit includes a set of calibration standards. The calibration standards are assayed at the same time as the samples and allow the operator to produce a standard curve of Optical Density versus VMA concentration. The concentration of VMA in the samples is then determined by comparing the O.D. of the samples to the standard curve.
PRINCIPLE OF THE ASSAY
The kit assay VMA level in the sample，use Purified antibody to coat microtiter plate wells, make solid-phase antibody, Samples which including standards of known concentrations and unknowns are pipetted into coated microtiter wells,
after Incubating ,add Biotinylated anti-IgG,and Combined Streptavidin-HRP, become antibody – antigen - enzyme- antibody complex, after washing Compley, Add TMB substrate solution, TMB Chromogen Solution Becomes blue color At HRP enzyme-catalyzed, And at the effect of acid the color finally become yellow, The intensity of this coloured product is directly proportional to the concentration of VMA present in the samples. measure the optical densit (OD) at 450 nm with microtiter plate reader, calculate VMA concentration by standard curve.
All reagents provided are stored at 2-8° C. Refer to the expiration date on the label.
3. STANDARD(240 U/L)
0.5ml 1 tube
5. STANDARD DILUENT
SAMPLE COLLECTION AND STORAGE
Serum- Use a serum separator tube(SST) and allow samples to clot for 30minutes before centrifugation for 15minutes at approximay 1000 x g.Remove serum and assay immediay or aliquot and store samples at -20 °C or -80°C.
Plasma - Collect plasma using EDTA or heparin as an anticoagulant.Centrifuge samples for 15 minutes at 1000 x g at 2-8°C within 30minutes of collection.Store samples at -20°C or -80°C.Avoid repeated freeze-thaw cycles.
Cell culture fluid and other biological fluids - Remove particulates by centrifugation and assay immediay or aliquot and store samples at -20°C or -80°C.Avoid repeated freeze-thaw cycles.
NOTE: Serum, plasma, and cell culture fluid samples to be used within 7 days may be stored at 2-8°C, otherwise samples must stored at -20°C(≤2months) or -80°C(≤6months) to avoid loss of bioactivity and contamination. Avoid freeze-thaw cycles .When performing the assay slowly bring samples to room temperature.
DO NOT USE HEAT-TREATED SPECIMENS.
MATERIALS REQUIRED BUT NOT SUPPLIED
5. Do not remove microtiter plate from the storage bag until needed. Unused strips should be stored at 2-8°C in their pouch with the desiccant provided.
8. Serum and plasma should be handled as potentially hazardous and capable of transmitting disease. Disposable gloves must be worn during the assay procedure, since no known test method can offer complete assurance that products derived from human blood will not transmit infectious agents. Therefore, all blood derivatives should be considered potentially infectious and good laboratory practices should be followed.
11. Liquid Waste: Add sodium hypochlorite to a final concentration of 1.0%. The waste should be allowed to stand for a minimum of 30 minutes to inactivate the viruses before disposal.
Standard -The Kit provides a stock standard（240 U/L）. Allow the standard to sit for a minimum of 5 minutes with gentle mixing prior to making dilutions.Pipette 150μL of Standard Dilution into each tube.
(total 5 tubes) Use the 150μL of stock solution to produce a 2-fold dilution series (including 120 U/L,60 U/L,30 U/L,15U/L , 7.5 U/L). Mix each tube thoroughly before the next transfer.
Wash Buffer - If crystals have formed in the concentrate, warm to room temperature and mix gently until the crystals have compley dissolved. To prepare enough Wash Buffer for one plate, add 20mL Wash Buffer Concentrate into deionized or distilled water to prepare 600mL of Wash Buffer.
Prepare all Standards before starting assay procedure (see Preparation Reagents). It is recommended that all Standards and Samples be added in duplicate to the Microtiter Plate.
1. Determine the number of microwell strips required to test the desired number of samples, Each sample, standard and blank should be assayed in duplicate.
sample and ELISA reagent, other each step operation is same). Add 50 μL of Standards or Samples to the appropriate well of the antibody pre-coated Microtiter Plate, and Gently mix. Incubate for 45 min at 37℃
wells, Incubate for 30 min at 37℃
Incubate for 15 min at 37℃
CALCULATION OF RESULTS
Average the duplicate readings for each standard,control, and sample and subtract the average zero standard optical density. Construct a standard curve by plotting the mean absorbance for each standard on the y-axis against the concentration on the x-axis and draw a best fit curve through the points on the graph. This procedure will produce an adequate but less precise fit of the data. If samples have been diluted, the concentration read from the standard curve must be multiplied by the dilution factor.