Overview
Collagen Cross-Linked C-Telopeptide (CTX) is a peptide fragment derived from the C-terminal end of type I collagen during bone resorption. As a specific biomarker, it reflects osteoclast activity and is clinically validated for monitoring bone turnover rates. First identified in the 1990s, CTX has become a gold-standard marker in metabolic bone disease diagnostics. Its measurement assists in evaluating osteoporosis treatment efficacy and predicting fracture risk in postmenopausal women and aging populations.
Physical and Chemical Properties
CTX exists as a small molecular weight peptide (approximately 1 kDa) with cross-linked amino acid structures characteristic of mature collagen degradation products. The β-isomer (β-CTX) is the biologically relevant form measured in clinical assays. The compound demonstrates stability in frozen conditions (-20°C) but degrades rapidly at room temperature in aqueous solutions. Analytical methods typically employ immunoassays due to its structural specificity, with ELISA being the most common detection platform.
Main Applications
In clinical diagnostics, CTX serves as a primary marker for assessing bone resorption in osteoporosis management. Elevated levels correlate with increased fracture risk and help guide antiresorptive therapy decisions. Research applications include studying bone metabolism in cancer metastases, rheumatoid arthritis, and endocrine disorders. Pharmaceutical companies utilize CTX measurements during drug development for bone-targeting therapeutics. The biomarker also finds use in veterinary medicine for animal bone health assessment.
Safety and Storage
As a biochemical reagent, CTX requires standard laboratory handling procedures including gloves and eye protection. Though non-hazardous in purified forms, associated assay components may contain preservatives requiring additional precautions. For optimal stability, lyophilized CTX should be stored at -20°C in desiccated conditions. Reconstituted solutions maintain activity for 1-2 weeks at 2-8°C. Avoid repeated freeze-thaw cycles as this may degrade epitopes critical for antibody recognition in assays.
B2B Procurement Guide
Bulk purchasers should prioritize suppliers with ISO 13485 certification for in vitro diagnostic materials. Key specifications include lot-to-lot consistency, certified reference ranges, and compatibility with major automated analyzer platforms. For research use, verify whether the product is native human sequence or synthetic analogue. Pricing tiers typically reflect purity levels (research grade vs. diagnostic grade) and volume discounts. Consider reagent stability during shipping, especially for international orders requiring cold chain logistics.
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