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Sircol™ Soluble plus Sircol™ Insoluble Collagen Combination Pack

  • Regulatory status:RUO
  • Type:Colorimetric assay
  • Species:Multispecies
Cat. No. Size Price

Discount S4000 2x 110 assays $1053,89
PubMed Product Details
Technical Data

Cat # changed from RBCS4000 to S4000


Colorimetric assay


Cell culture and/or animal studies, Tissue


At ambient temperature. Upon receipt, store the product at the temperature recommended below.


All components are stable for one year, (from Invoice Date), when stored at 15–25°C. The glass vial containing collagen standard should be stored at +4°C once opened.

Calibration Range

Soluble collagen:

2.5 to 12.5 μg using 250μl of Alkali Reagent to recover the collagen bound dye
10 to 50 μg using 1000μl of Alkali Reagent to recover the collagen bound dye

Insoluble collagen: 20 – 60 μg using denatured collagen standards

Limit of Detection

Soluble collagen: 1 μg
Insoluble collagen: 10 μg



  • The Sircol™ Solluble Collagen and Insoluble Collagen Assays are dye-binding methods designed for the analysis of acid and pepsin-soluble collagens, or insoluble collagen fibers, respectively.
  • The assays can assess the rate of newly synthesised collagen produced during periods of rapid growth and development. New collagen is also generated during inflammation, wound healing and tumour development.
  • Sources of material include tissues, bone and calcified tissue.
  • The Sircol Assays are suitable for monitoring collagen produced in situ or during in-vitro cell culture and in-vitro extracellular matrix, (ECM), formation.
  • Mammalian collagens; Types I to V can be measured. Sircol Dye reagent does not discriminate between collagen types, binding to the [Gly-X-Y]n helical structure as found in collagen.
  • Not suitable for covalent cross-linked collagen. This insoluble collagen can be estimated, following acid hydrolysis, (HCl (6M), 110 °C, overnight), with an amino acid analyser to measure the collagen marker - hydroxyproline.
  • It replaces the conventional hydroxyproline analysis. No more working with concentrated acids or alkalis!
  • The Sircol Insoluble Assay uses mild acid and temperature treatment for 2 to 3 hrs.
  • The solubility conversion to denatured collagen and subsequent measurement can be completed within one working day.
  • The ratio of soluble and insoluble collagens can be measured using the same Sircol Dye Reagent.
  • Manufactured by Biocolor.

Research topic

Extracellular matrix, Animal studies


Soluble and Insoluble Collagen measurement Collagen is the most abundant protein found in animals. During a healthy life span the insoluble, covalent, cross-linked collagen fibers retain their biophysical functions and shapes. The collagen fibers remain isolated from most of the biochemical activities of the cells.
Trauma caused by metabolic internal events, external chemical agents or physical injuries however, quickly lead to dramatic activity, resulting in rapid collagen removal followed by a wound healing response (collagen regeneration and associated remodeling). Newly formed soluble collagen production and the residual insoluble collagen fibers can be monitored using the Sircol Soluble Collagen and Sircol Insoluble Collagen Assays.
Collagen proteins contain one or more domains with a triple helical structure. The three chains are described as alpha chains and should not be confused with the alpha helixes found in other proteins. The fibrillar collagens (Types I, II, III, V & XI) have most of their alpha chain structure composed of a continuous repeating tri-peptide sequence made up of glycine in every third amino acid residue [(gly-X-Y)n ]. It is to this sequence that the Sircol Dye binds.
Proline is frequently an occupant in the ‘Y’ location of the tri-peptide [(gly-X-Y)n]. Many of these residues are converted, post translation, into hydroxyproline residues prior to triple helix formation and the release of the tropocollagen into the ECM.
Until now, an investigator seeking to measure covalent cross-linked insoluble collagen required measurements based on free hydroxyproline content - a procedure that requires strong acid (6.0 M HCl), high temperatures (+ 95 °C) and overnight cooking (18 to 24 hrs).

Summary References (1)

References to Collagen

  • Ricard-Blum S. The collagen family. Cold Spring Harb Perspect Biol. 2011 Jan 1;3(1):a004978. doi: 10.1101/cshperspect.a004978. PMID: 21421911; PMCID: PMC3003457. See more on PubMed
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