Trimethoprim (TMP) ELISA Kit
For reference only. Please follow the manual included in your kit for instructions.
Catalog Number
RDF-E023
The Trimethoprim (TMP) ELISA Kit (RDF-E023) is an enzyme-linked immunosorbent assay for quantitative detection of TMP in Food samples with a standard range of 0.015-1.215ppb. This kit uses the Traditional ELISA format for colorimetric detection of natural TMP in samples including Muscle,Feed,Serum,Urine. The kit is easy to use and comes with a pre-coated microplate and all necessary reagents and buffers. The standard curve generated in the experiment is used to calculate the concentration of TMP in samples. For research use only.
Product Specifications
Product Name
Trimethoprim (TMP) ELISA Kit
Catalog Number
RDF-E023
Detection Range
0.015-1.215ppb
Species Reactivity
Food
Species
Food
Assay Length
60 minutes
Experimental Method
Competitive Inhibition
Detection Method
Colorimetric
Sample Type
Muscle,Feed,Serum,Urine
Storage
2-8°C,Avoid freeze
Shelf Life
12 monthes
Product Details
Intended Use
For the quantitative detection of sarafloxacin concentration in muscle, feed, serum, and urine samples.
Assay Principle
This kit uses Competitive-ELISA as the method for the quantitative detection. It can detect Trimethoprim (TMP) in samples, such as muscle, feed, etc. This kit is composed of ELISA Microtiter plate, HRP conjugate, standard liquid and other supplementary reagents. The microtiter plate in this kit has been pre-coated with antibodies. During the reaction, TMP in the samples or standard competes with Horseradish Peroxidase (HRP) conjugate for sites. Add substrate reagent is added for color development. There is a negative correlation between the OD value of samples and the concentration of TMP. The concentration of TMP in the samples can be calculated by comparing the OD of the samples to the standard curve.
Application Data
Reagents and Materials Provided
| Reagent | Quantity |
|---|---|
| ELISA Microtiter plate | 96 wells |
| Standard Liquid | 1 mL each (ppb=ng/mL=ng/g) (0 ppb, 0.015 ppb, 0.045 ppb, 0.135 ppb, 0.405 ppb, 1.215 ppb) |
| HRP Conjugate | 5.5 mL |
| Substrate Reagent A | 6 mL |
| Substrate Reagent B | 6 mL |
| Stop Solution | 6 mL |
| 20xConcentrated Wash Buffer | 40 mL |
| 2xReconstitution Buffer | 50 mL |
| Plate Sealer | 3 |
| Sealed Bag | 1 |
| Manual | 1 |
All reagent bottle caps should be tightly closed to prevent evaporation and microbial contamination.
Materials Required but not Supplied
- Equipment: Microplate reader, printer, homogenizer, nitrogen evaporators, vortex mixer, centrifuge, graduated pipette, Balance (sensibility 0.01 g), water bath.
- Micropipettes: Single channel (20-200 μL, 100-1000 μL), Multichannel (30-300 μL).
- Reagents: Anyhdrous methanol, N-hexane, NaOH, concentrated HCl.
Storage
- Store the kit at 2-8℃. Do not freeze any kit components.
- Return any unused microwells to their original foil bag and reseal them together with the desiccant provided. Continue to store at 2-8℃.
- Shelf life is approximately 12 months from date of manufacture. Check packaging for expiry date.
Sample Preparation
- Feed:
- Weigh 2±0.05 g of homogenate sample into 50 mL centrifuge tube. Add 20 mL of 0.1 M HCl Solution (Solution 2), vortex for 15 min, centrifuge at 3000 r/min for 10 min at room temperature;
- Take 1 mL of the supernatant to a clean 1.5 mL centrifuge tube, add about 70 μL of 1 M NaOH Solution (Solution 3), adjust pH to 6-8 ( the volume of 1 M NaOH can be adjusted according to different sample), mix fully. Centrifuge at 3000 r/min for 10 min at room temperature;
- Take 0.5 mL of the supernatant to another 1.5 mL centrifuge tube, add 0.5 mL of Reconstitution Buffer (Solution 1) , mix fully;
- Take 50 μL of for analysis.
- Muscle (animal food commodities):
- Weigh 2±0.05 g of homogenate sample that without fat into 50 mL centrifuge tube. Add 6 mL of Anhydrous methanol and 2 mL of N-hexane, vortex fully for 5 min.
- Centrifuge at 4000 r/min for 10 min at room temperature, discard the upper layer N-hexane, take 0.5 mL of lower layer liquid to a clean test glass (avoid to touch fat layer).
- Dry at 50-60℃ with nitrogen evaporators or water bath.
- Add 400 μL of Reconstitution Buffer (Solution 1) and 500 μL of N-hexane, vortex fully for 1 min at maximum speed.
- Transfer the mixed solution to a 1.5 mL centrifuge tube, centrifuge at 4000 r/min for 5 min at room temperature. Discard the upper layer N-hexane.
- Take 50 μL of lower layer liquid for analysis.
- Serum, urine (swine):
- Take 0.5 mL of sample, centrifuge at 4000 r/min for 5 min at room temperature.
- Take 50 μL of supernatant, add 200 μL of Reconstitution Buffer (Solution 1) and mix fully.
- Take 50 μL for analysis.
Reagent Preparation
Solution preparation:
Prepare solutions according to the number of samples. Avoid using all components in the kit at once.
Solution 1: Reconstitution Buffer
Dilute the 2×Reconstitution Buffer with deionized water. (2×Reconstitution Buffer (V): Deionized water (V) =1:1). The Reconstitution buffer can be store at 4℃ for a month.
Solution 2: 0.1 M HCl Solution (for feed sample)
Dilute 10 mL of Concentrated HCl to 1200 mL with deionized water, mix fully.
Solution 3: 1 M NaOH Solution (for feed sample)
Dissolve 4g of NaOH to 100 mL with deionized water, mix fully.
Solution 4: Wash buffer
Dilute 20×Concentrated Wash Buffer with deionized water. (20×Concentrated Wash Buffer (V): Deionized water (V) = 1:19).
Notes:- Bring all reagents and samples to room temperature before use.
- Turn on the microplate reader 30 min in advance to preheat the instrument and set the testing parameters.
- All experimental apparatus should be clean, and disposable pipette should be used and changed frequently to avoid cross-contamination during the experiment.
Assay Procedure
Bring all reagents and samples to room temperature (25℃) before use. All reagents should be mixed thoroughly by gently swirling before pipetting. Avoid foaming. Any unused Microtiter plate wells should be resealed as soon as possible and stored at 2-8℃.
- Number: number the samples and standards in order (multiple wells), and keep a record of the plate layout. Standards and Samples must be tested in duplicate.
- Add Sample: add 50 μL of Standard or Sample to each well, then add 50 μL of HRP Conjugate into each well. Oscillate gently for 5 s to mix thoroughly and cover the plate with a plate sealer, then incubate at 37℃ for 45 min in the dark.
- Wash: Carefully remove the plate sealer, then remove the liquid from each well. Immediately add 300 μL of Wash Buffer (Solution 4) to each well and wash. Repeat wash procedure 5 times, 30 s intervals each time. Invert the plate and pat it against a thick sheet of absorbent paper (If there are bubbles in the wells, clean pipette tips can be used to pop them).
- Color Development: add 50 μL of Substrate Reagent A to each well, and then add 50 μL of Substrate Reagent B. Gently oscillate for 5 s to mix thoroughly. Incubate at 37℃ for 15 min in the dark (The reaction time can be extended according to the amount of color change).
- Stop Reaction: add 50 μL of Stop Solution to each well. Gently oscillate to mix thoroughly.
- OD Measurement: determine the optical density (OD value) of each well at 450 nm (reference wavelength 630 nm) with a microplate reader. This step should be performed no later than 10 min after the reaction has been stopped.
Calculation of Results
Absorbance (%) = A/A₀×100%
- A: Average absorbance of standard or sample
- A₀: Average absorbance of 0 ppb Standard
- Drawing and calculation of standard curve
- Create a standard curve by plotting the absorbance percentage of each standard on the y-axis against the log concentration on the x-axis to draw a semi-logarithmic plot. Add the average absorbance value of each sample to the standard curve to calculate the corresponding concentration. If samples have been diluted, the concentration calculated from the standard curve must be multiplied by the dilution factor.
- We recommend using professional software for fast and accurate analysis of large numbers of samples.
Product Data
Reaction conditions (Incubation time and temperature)
37℃; 45 min, 15 min
Detection limit
Feed---0.8 ppb; Muscle---0.2 ppb; Serum, Urine---0.2 ppb
Cross-reactivity
Trimethoprim ---100%, Sulfapyridine---＜0.1 Sulfadiazine---＜0.1%, Sulfisoxazole---＜0.1%, Sulfathiazole ---＜0.1%, Sulfamerazine---＜0.1%, Sulfadoxine---＜0.1%,
Sample recovery rate
Feed---85%±10%; Serum, Urine---85%±10%; Muscle--- 85%±15%