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  • Title: Comparison of proteoglycans from bovine articular cartilage.
    Author: Strider W, Pal S, Rosenberg L.
    Journal: Biochim Biophys Acta; 1975 Jan 30; 379(1):271-81. PubMed ID: 123161.
    Abstract:
    Four bovine articular cartilages have been compared with regard to the chemical composition of the whole cartilages, the amount of proteoglycan selectively extracted with 3 M MGCl2 or with 3 M guanidine-HCl, and the compositions and physical properties of the isolated proteoglycans. The whole cartilages differ but slightly in composition. Occipital condylar cartilage, a thin cartilage from the smallest joint, contains 4% more collagen and proportionately less proteoglycan than proximal humeral, the thickest cartilage from the largest joint. Each cartilage contains a pool of proteoglycan that resists extraction with 3 M MgCl2 but is extracted with 3 M guanidine-HCl. The proteoglycan extracted from each cartilage with 3 M guanidine-HCl contains a high molecular weight proteoglycan-collagen complex demonstrated by analytical ultracentrifugation and by the turbidity of its visible and ultra-violet spectra. The four cartilages appear to differ most remarkably in the fraction of total proteoglycan extracted from each as proteoglycan-collagen complex.
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