ELISA Kit for Osteonectin (ON)

SPARC; BM-40; Secreted Protein,Acidic,Cysteine-Rich; Basement-membrane protein 40; Secreted protein acidic and rich in cysteine


This assay has high sensitivity and excellent specificity for detection of Osteonectin (ON).
No significant cross-reactivity or interference between Osteonectin (ON) and analogues was observed.


Matrices listed below were spiked with certain level of recombinant Osteonectin (ON) and the recovery rates were calculated by comparing the measured value to the expected amount of Osteonectin (ON) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 98-105 102
EDTA plasma(n=5) 91-99 95
heparin plasma(n=5) 81-101 96


Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Osteonectin (ON) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Osteonectin (ON) 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 Osteonectin (ON) 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) 80-97% 99-105% 96-103% 78-97%
EDTA plasma(n=5) 97-105% 79-101% 86-101% 80-88%
heparin plasma(n=5) 98-105% 96-105% 95-105% 85-102%


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 1×120µL Assay Diluent A 1×12mL
Detection Reagent B 1×120µL Assay Diluent B 1×12mL
TMB Substrate 1×9mL Stop Solution 1×6mL
Wash Buffer (30 × concentrate) 1×20mL Instruction manual 1

Assay procedure summary

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



Magazine Citations
J Mol Med (Berl) Growth hormone replacement therapy regulates microRNA-29a and targets involved in insulin resistance PubMed: 26199111
Muscle Nerve Effect of resistance ladder training on SPARC expression in skeletal muscle of hindlimb immobilized rats PubMed: 26467437
Medicine (Baltimore) An Attempt to Evaluate Selected Aspects of “Bone–Fat Axis” Function in Healthy Individuals and Patients With Pancreatic Cancer PubMed: 26266370
British Journal of Cancer A proteomics-based approach identifies secreted protein acidic and rich in cysteine as a prognostic biomarker in malignant pleural mesothelioma Pubmed:26889976
Journal of diabetes and its complications Associations between FGF21, osteonectin and bone turnover markers in type 2 diabetic patients with albuminuria. pubmed:27916484
American journal of the medical sciences Association of Bone Metabolic Markers With Diabetic Retinopathy and Diabetic Macular Edema in Elderly Chinese Individuals With Type 2 Diabetes Mellitus pubmed:29078839
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