Streptomycin (SM) ELISA Kit
For reference only. Please follow the manual included in your kit for instructions.
Catalog Number
RDF-E031
The Streptomycin (SM) ELISA Kit (RDF-E031) is an enzyme-linked immunosorbent assay for quantitative detection of SM in Food samples with a standard range of 0.1-8.1ppb. This kit uses the Traditional ELISA format for colorimetric detection of natural SM in samples including Muscle,Honey,Milk,Milk powder,Egg. 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 SM in samples. For research use only.
Product Specifications
Product Name
Streptomycin (SM) ELISA Kit
Catalog Number
RDF-E031
Detection Range
0.1-8.1ppb
Species Reactivity
Food
Species
Food
Assay Length
75 minutes
Experimental Method
Competitive Inhibition
Detection Method
Colorimetric
Sample Type
Muscle,Honey,Milk,Milk powder,Egg
Storage
2-8°C,Avoid freeze
Shelf Life
12 monthes
Product Details
Intended Use
For the quantitative detection of streptomycin concentration in muscle, honey, milk, milk powder, and egg samples.
Assay Principle
This kit uses Competitive-ELISA as the method for the quantitative detection. It can detect Streptomycin (SM) in muscle, honey, etc. This kit is composed of ELISA Microtiter plate, HRP conjugate, antibody working solution, standard and other supplementary reagents. The microtiter plate in this kit has been pre-coated with coupled antigen. During the reaction, SM in the samples or standard competes with coupled antigen on the solid phase supporter for sites of anti-SM antibody. Then Horseradish Peroxidase (HRP) conjugate is added to each microtiter plate well, and substrate reagent is added for color development. There is a negative correlation between the OD value of samples and the concentration of SM. The concentration of SM 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, 0.1 ppb, 0.3 ppb, 0.9 ppb, 2.7 ppb, 8.1 ppb) |
| HRP Conjugate | 11 mL |
| Antibody Working Solution | 5.5 mL |
| Substrate Reagent A | 6 mL |
| Substrate Reagent B | 6 mL |
| Stop Solution | 6 mL |
| 20xConcentrated Wash Buffer | 40 mL |
| 5xReconstitution 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, water bath, vortex mixer, centrifuge, graduated pipette, Balance (sensibility 0.01 g).
- Micropipettes: Single channel (20-200 μL, 100-1000 μL), Multichannel (30-300 μL).
- Reagents: NaOH, Na2HPO4•12H2O, NaH2PO4•2H2O, N-hexane, 85% Phosphoric acid (H3PO4), Methanol, Acetic acid (AR, 99.5%).
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
- Muscle:
- Remove fat from sample. Homogenize the representative sample with a homogenizer and mix fully.
- Weigh 2±0.05 g of homogenate sample without fat to centrifuge tube, add 8 mL of 0.05 M PB Buffer (Solution 1). Oscillate for 5 min and incubate at 56℃ water bath for 30 min.
- Centrifuge at 4000 rpm for 5 min at room temperature.
- Take 1 mL of the supernatant and add 1 mL of N-hexane to another centrifuge tube. Mix fully and centrifuge at 4000 rpm for 5 min at room temperature.
- Discard the upper organic phase layer, take 50 μL of the lower liquid to another centrifuge tube. Add 450 μL of Reconstitution Buffer (Solution 6), mix fully for 30 s.
- Take 50 μL for analysis.
- Honey:
- Weigh 2±0.05 g of honey to centrifuge tube, add 4 mL of 0.04 M H3PO4 Solution (Solution 2), oscillate until dissolved fully. Centrifuge at 4000 rpm for 5 min at room temperature.
- Take all of supernatant to another centrifuge tube. And add 450 μL of 1 M NaOH Solution (Solution 3) to adjust the pH to 7-9. Centrifuge at 4000 rpm for 5min at room temperature.
- Take 50 μL of supernatant and add 450 μL of Reconstitution Buffer (Solution 6) to another centrifuge tube, mix fully for 30 s.
- Take 50 μL for analysis.
- Milk and milk powder:
- Weigh 2±0.05 g of sample to centrifuge tube, add 8 mL of 0.05 M PB Buffer (Solution 1), oscillate for 5 min, incubate at 56℃ water bath for 30 min.
- Centrifuge at 4000 rpm for 10 min at room temperature.
- Discard the upper fat layer and take 50 μL of clear liquid of the middle layer to another centrifuge tube. Add 450 μL of Reconstitution Buffer (Solution 6), mix fully for 30 s.
- 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: 0.05 M PB Buffer (for muscle, milk, milk powder sample)
Dissolve 12.9 g of Na2HPO4•12H2O and 2.175 g of NaH2PO4•2H2O to 1000 mL with deionized water, mix fully.
Solution 2: 0.04 M H3PO4 Solution (for honey sample)
Dilute 1 mL of 85% H3PO4 to 360 mL with deionized water, mix fully.
Solution 3: 1 M NaOH Solution (for honey sample)
Dissolve 4 g of NaOH to 100 mL with deionized water, mix fully.
Solution 4: 1% Acetic acid Solution (for egg sample)
Dissolve 1 mL of Acetic acid to 100 mL with deionized water, mix fully.
Solution 5: 70% Methanol Solution (for egg sample)
Dissolve 700 mL of Methanol to 1000 mL with deionized water, mix fully.
Solution 6: Reconstitution Buffer
Dilute the 5×Reconstitution Buffer with deionized water, mix fully. (5×Reconstitution Buffer (V): Deionized water (V) = 1:4).
The Reconstitution buffer can be store at 4℃ for a month.
Solution 7: Wash Buffer
Dilute 20×Concentrated Wash Buffer with deionized water, mix fully. (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 Antibody Working Solution, and cover the plate with plate sealer. Oscillate gently for 5 s to mix thoroughly, then incubate at 25℃ for 30 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 7) 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).
- HRP Conjugate: add 100 μL of HRP Conjugate to each well, incubate at 25℃ for 30 min in the dark.
- Wash: repeat step 3.
- 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 25℃ 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 for 10 s 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)
25℃; 30 min, 30 min, 15 min
Detection limit
Muscle---4 ppb; Honey---2 ppb; Milk, Milk powder---5 ppb; Egg---10 ppb
Cross-reactivity
Streptomycin---100%; Dihydrostreptomycin---100%; Clarithromycin---6.3%; Gentamicin---2.5%.
Sample recovery rate
85%±15%.