ELISA Kit for Cross Linked C-Telopeptide Of Type II Collagen (CTXII)



This assay has high sensitivity and excellent specificity for detection of Cross Linked C-Telopeptide Of Type II Collagen (CTXII).
No significant cross-reactivity or interference between Cross Linked C-Telopeptide Of Type II Collagen (CTXII) and analogues was observed.


Matrices listed below were spiked with certain level of recombinant Cross Linked C-Telopeptide Of Type II Collagen (CTXII) and the recovery rates were calculated by comparing the measured value to the expected amount of Cross Linked C-Telopeptide Of Type II Collagen (CTXII) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 99-105 102
EDTA plasma(n=5) 87-101 93
heparin plasma(n=5) 98-105 101


Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Cross Linked C-Telopeptide Of Type II Collagen (CTXII) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Cross Linked C-Telopeptide Of Type II Collagen (CTXII) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%


The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Cross Linked C-Telopeptide Of Type II Collagen (CTXII) and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample 1:2 1:4 1:8 1:16
serum(n=5) 93-101% 87-95% 78-103% 82-102%
EDTA plasma(n=5) 97-104% 94-105% 83-97% 80-103%
heparin plasma(n=5) 86-97% 97-105% 80-101% 82-96%


The stability of kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition.
To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.

Reagents and materials provided

Reagents Quantity Reagents Quantity
Pre-coated, ready to use 96-well strip plate 1 Plate sealer for 96 wells 4
Standard 2 Standard Diluent 1×20mL
Detection Reagent A 1 Assay Diluent A 1×12mL
Detection Reagent B 1×120µL Assay Diluent B 1×12mL
Reagent Diluent 1×300µL Stop Solution 1×6mL
TMB Substrate 1×9mL Instruction manual 1
Wash Buffer (30 × concentrate) 1×20mL

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 50µL standard or sample to each well.
    And then add 50µL prepared Detection Reagent A immediately.
    Shake and mix. Incubate 1 hour at 37°C;
3. Aspirate and wash 3 times;
4. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
5. Aspirate and wash 5 times;
6. Add 90µL Substrate Solution. Incubate 10-20 minutes at 37°C;
7. Add 50µL Stop Solution. Read at 450 nm immediately.



Magazine Citations
Cartilage Comparison of Intra-articular Injection of Hyaluronic Acid and N-Acetyl Cysteine in the Treatment of Knee Osteoarthritis A Pilot Study 1947603516675915.abstract
BioMed Research International Decreased Plasma COMP and Increased Plasma CTX-II Levels in a Chinese Pseudoachondroplasia Family with Novel COMP Mutation pubmed:29104872
In Vivo Osteochondral Repair Using Porous Three-dimensional Nanocomposite Scaffolds in a Rabbit Model pubmed:28882956
Aging Cell Transthyretin deposition promotes progression of osteoarthritis pubmed:28941045
Molecular Medicine Reports Mori Folium water extract alleviates articular cartilage damages and inflammatory responses in monosodium iodoacetate‑induced osteoarthritis rats pubmed:29067461
Experimental and Clinical Sciences International online journal for advances in science Schisandrae Fructus ethanol extract ameliorates inflammatory responses and articular cartilage damage in monosodium iodoacetate-induced osteoarthritis in rats. pubmed:28507472
Advances in Clinical and Experimental Medicine Fibulin-3 and other cartilage metabolism biomarkers in relationship to calprotectin (MRP8/14) and disease activity in rheumatoid arthritis patients treated with … 68362.pdf
Journal of Orthopaedic Surgery and Research The levels of urine CTX-II, C2C, and PYD in children patients with Kashin-Beck disease in Qinghai Province of China Pubmed: 30635000
Nutrients The Preventive Effects of Greenshell Mussel (Perna canaliculus) on Early-Stage Metabolic Osteoarthritis in Rats with Diet-Induced Obesity Pubmed: 31311115
International journal of molecular sciences Differences in Osteoimmunological Biomarkers Predictive of Psoriatic Arthritis among a Large Italian Cohort of Psoriatic Patients Pubmed: 31717649
Applied Physiology Nutrition and Metabolism Effectiveness of collagen supplementation on pain scores in healthy individuals with self-reported knee pain; A randomized controlled trial Pubmed: 31990581
heliyon Oral intake of Streptococcus thermophilus improves knee osteoarthritis degeneration: A randomized, double-blind, placebo-controlled clinical study
Catalog No. Related products for research use of Equus caballus; Equine (Horse) Organism species Applications (RESEARCH USE ONLY!)
CEA686Eq ELISA Kit for Cross Linked C-Telopeptide Of Type II Collagen (CTXII) Enzyme-linked immunosorbent assay for Antigen Detection.