Click here to view cell apoptosis assay products

Human β-EP(Beta-Endorphin) ELISA Kit

  • Cat.No.:E-EL-H0572

  • Reactivity: Human

To Purchase E-EL-H0572

  • 96T
  • 48T
  • 24T
  • 96T*5
  • 96T*10
Price: $495

Product Details


Assay type Competitive-ELISA
Format 96T/48T
Assay time 2.0h
Detection range 15.63-1000 pg/mL
Sensitivity 9.38 pg/mL
Sample type &Sample volume serum, plasma and other biological fluids; 50μL
Specificity This kit recognizes β-EP in samples. No significant cross-reactivity or interference between β-EP and analogues was observed.
Reproducibility Both intra-CV and inter-CV are < 10%.
Application This ELISA kit applies to the in vitro quantitative determination of β-EP concentrations in serum, plasma and other biological fluids.

Test Principle

This ELISA kit uses the Competitive-ELISA principle. The micro ELISA plate provided in this kit has been pre-coated with β-EP. During the reaction, β-EP in the sample or standard competes with a fixed amount of β-EP on the solid phase supporter for sites on the Biotinylated Detection Ab specific to β-EP. Excess conjugate and unbound sample or standard are washed away, and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well and incubated. Then a TMB substrate solution is added to each well. The enzyme-substrate reaction is terminated by the addition of stop solution and the color turns from blue to yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The concentration of β-EP in tested samples can be calculated by comparing the OD of the samples to the standard curve.

Kit components & Storage

An unopened kit can be stored at 2-8℃ for 1 month. If the kit is not supposed to be used within 1 month, store the components separately according to the following conditions once the kit is received.
Micro ELISA Plate(Dismountable) 96T: 8 wells ×12 strips
48T: 8 wells ×6 strips
-20℃, 6 months
Reference Standard 96T: 2 vials
48T: 1 vial
Concentrated Biotinylated Detection Ab (100×) 96T: 1 vial, 120 μL
48T: 1 vial, 60 μL
Concentrated HRP Conjugate (100×) 96T: 1 vial, 120 μL
48T: 1 vial, 60 μL
-20℃(Protect from light), 6 months
Reference Standard & Sample Diluent 1 vial, 20 mL 2-8°C, 6 months
Biotinylated Detection Ab Diluent 1 vial, 14 mL
HRP Conjugate Diluent 1 vial, 14 mL
Concentrated Wash Buffer (25×) 1 vial, 30 mL
Substrate Reagent 1 vial, 10 mL 2-8℃(Protect from light)
Stop Solution 1 vial, 10 mL 2-8℃
Plate Sealer 5 pieces
Manual 1 copy
Certificate of Analysis 1 copy

Technical Data


Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level β-EP were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level β-EP were tested on 3 different plates, 20 replicates in each plate.

  Intra-assay Precision Inter-assay Precision
Sample 1 2 3 1 2 3
n 20 20 20 20 20 20
Mean (pg/mL) 45.50 153.00 435.30 46.70 158.10 426.00
Standard deviation 2.90 7.50 20.00 2.80 6.60 13.60
CV (%) 6.37 4.90 4.59 6.00 4.17 3.19


The recovery of β-EP spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

Sample Type Range (%) Average Recovery (%)
Serum(n=8) 90-107 97
EDTA plasma(n=8) 87-102 93
Cell culture media(n=8) 84-97 91


Samples were spiked with high concentrations of Human β-EP and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

Target Information

Database LinksSwissProt: P01189
Research AreaCancer, Metabolism, Neuroscience, Signal transduction

Assay Procedures

elisa assay procedure 1

1. Add 50μL standard or sample to the wells, immediately add 50μL Biotinylated Detection Ab working solution to each well. Incubate for 45 min at 37°C

elisa assay procedure 2

2. Aspirate and wash the plate for 3 times

elisa assay procedure 3

3. Add 100μL HRP conjugate working solution. Incubate for 30 min at 37°C. Aspirate and wash the plate for 5 times

elisa assay procedure 4

4. Add 90μL Substrate Reagent. Incubate for 15 min at 37°C

elisa assay procedure 5

5. Add 50μL Stop Solution

elisa assay procedure 6

6. Read the plate at 450nm immediately. Calculation of the results


    Sublingual buprenorphine/naloxone treatment is not affected by OPRM1 A118G and BDNF Va66Met polymorphisms, but alters the plasma beta-endorphin and BDNF levels in individuals with opioid use disorder

    DOI: 10.1016/j.etap.2022.103979

    PMID: 36174909

    Sample: plasma
    Sunny walking counts more

    DOI: 10.1038/s41401-019-0241-9

    PMID: 31249388

    Sample: Urine
    Low-intensity walking as mild medication for pressure control in prehypertensive and hypertensive subjects: how far shall we wander?

    DOI: 10.1038/s41401-018-0202-8

    PMID: 30760834

    Sample: Urine
  4. Translational Psychiatry (2018) IF: 4.691
    Prefrontal expectancy and reinforcement-driven antidepressant placebo effects

    DOI: 10.1038/s41398-018-0263-y

    PMID: 30323205

    Sample: Plasma
    I-gel Laryngeal Mask Airway Combined with Tracheal Intubation Attenuate Systemic Stress Response in Patients Undergoing Posterior Fossa Surgery

    DOI: 10.1155/2015/965925

    Sample: Serum
  6. NEUROPEPTIDES (2022) IF: 3.286
    Altered levels of neurobiological biomarkers at the interface of depression and gestational diabetes mellitus in Asian Indian women

    DOI: 10.1016/j.npep.2022.102245

    PMID: 35461022

    Sample: plasma
    Neuroendocrine and inflammatory responses to DHEA administration in young healthy women

    DOI: 10.1016/j.pbb.2018.09.001

    Sample: blood
  8. Endokrynologia Polska (2021) IF: 1.582
    An assessment of the effectiveness of regional analgesia after VATS measured by an objective method for assessing testosterone, cortisol, α-amylase, sIgA, and β-endorphin levels — a randomised controlled trial

    DOI: 10.5603/EP.a2021.0004

    Sample: plasma
Show AllShorten


  • Show all
  • Reviews
  • Q&A

A**tSubmitted [ Jul 18 2023 ]

Asked: I am reaching out to inquire about the suitability of your ELISA kit for a specific scientific experiment involving the detection of endorphin and another endogenous opioid peptide in a non-standard rodent model. Uniprot alignment shows a 89% similarity between our research model and human endorphin sequence and 85 % alignment with mice. I believe your ELISA kit for human or mouse may be applicable for this purpose. However, I kindly request your assistance in providing information regarding the amino acids that act as epitopes for the antibodies in these kits. This information would allow me to compare the amino acid sequences and determine the most appropriate kit to order for my experiment. Thank you for your attention to this matter, and I look forward to your response.



adminSubmitted [ Jul 18 2023 ]

Answered: Unfortunately, we have not yet identified the specific epitopes that the antibodies of endorphin ELISA Kits target. All our products undergo a series of performance tests on the sample during the development stage, including the measurement range test, recovery test, sensitivity test and precision test, etc., to ensure the detection performance of the kits on the samples from target species . For samples of other species, we suggest that the customer can order a small-size kit for pre-testing to confirm whether it can be used for customer's sample.


D********aSubmitted [ Mar 25 2018 ]

Asked: How long after receiving this kit will it expire?



P*******nSubmitted [ Mar 25 2018 ]

Answered: Dear Dr. Jessica, Thanks for your message. The valid time is 6 months after delivery. If you have ordered our products, please open the box, and you could find out the specific expiry date on reagent vials. At the same time, please notice the storage method for each vial in the kit.

... Show All Show Less

People Also Bought

Apply for Free Shipping 24T ELISA Kit
*Product Name:
*Catalog Number:
*When will you use it?