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Human β-CTx(Beta Crosslaps) ELISA Kit

  • Cat.No.:E-EL-H0960

  • Reactivity: Human

To Purchase E-EL-H0960

  • 96T
  • 48T
  • 24T
  • 96T*5
  • 96T*10
Price: $609

Product Details


Assay type Competitive-ELISA
Format 96T/48T
Assay time 2.0h
Detection range 125.00-8000 pg/mL
Sensitivity 75.00 pg/mL
Sample type &Sample volume serum, plasma and other biological fluids; 50μL
Specificity This kit recognizes β-CTx in samples. No significant cross-reactivity or interference between β-CTx 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-CTx 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-CTx. During the reaction, β-CTx in the sample or standard competes with a fixed amount of β-CTx on the solid phase supporter for sites on the Biotinylated Detection Ab specific to β-CTx. 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-CTx 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-CTx were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level β-CTx 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) 399.60 1081.00 2908.70 419.00 1051.00 2875.80
Standard deviation 26.80 62.70 130.90 23.90 49.40 158.20
CV (%) 6.71 5.80 4.50 5.70 4.70 5.50


The recovery of β-CTx 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) 84-95 90
EDTA plasma(n=8) 94-105 99
Cell culture media(n=8) 92-106 99


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

Target Information

Synonymsb-CTx, bCTXI, bCTX-I, B-Cr, BCL, Type I Collagen C-Telopeptide-Related Fraction
Research AreaSignal transduction, Metabolism

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


  1. Frontiers in Nutrition (2022) IF: 6.576
    Acute Effects of Milk vs. Carbohydrate on Bone Turnover Biomarkers Following Loading Exercise in Young Adult Females

    DOI: 10.3389/fnut.2022.840973

    PMID: 35571916

    Sample: Serum
  2. Experimental and Therapeutic Medicine (2019) IF: 1.448
    Efficacy of vitamin D plus calcium with/without alendronate on bone metabolism in immunologic thrombocytopenic purpura patients with steroid treatment: Nine‑month results of a randomized, double‑blinded, controlled trial

    DOI: 10.3892/etm.2019.7694

    Sample: Serum,Urine
  3. Applied Sciences-Basel (2022) IF: 2.838
    Alendronate Prevents Early Periprosthetic Bone Loss in Cementless Total Hip Arthroplasty Better Than Simvastatin

    DOI: 10.3390/app12168054

    Sample: Serum
  4. Pain Physician (2020) IF: 3.251
    Observational Study to Evaluate the Effect of Epidural Steroid Injection on Bone Mineral Density and Bone Turnover Markers.

    PMID: 32967402

    Sample: Serum
  5. BONE (2018) IF: 4.455
    Bone and plasma citrate is reduced in osteoporosis

    DOI: 10.1016/j.bone.2018.06.014

    Sample: Serum
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