Abstract
Bovine nasal cartilage was extracted with 0.5 M LaCl 3 and the extract then diluted with nine volumes of water. The resulting precipitate (P LaCl 3 ) contained the proteoglycan subunits, together with minor protein components, but was essentially free from hyaluronic acid. The properties of P LaCl 3 were investigated by chemical analysis, electrophoresis, viscometry and analytical ultracentrifugation, and the results compared with those for proteoglycan obtained by caesium chloride density gradient centrifugation of 2 M CaCl 2 cartilage extracts. Proteoglycan subunits (A1D1) prepared from P LaCl 3 showed identical properties to those obtained from other high ionic strength cartilage extracts.
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