title: The use of brominated toluidine blue O in X-ray microanalysis for proteoglycan.
abstract: Toluidine blue O, a cationic dye has been used for visualizing proteoglycan by light and electron microscopy. Toluidine blue O has now been brominated and incorporated into epiphyseal cartilage during its fixation. Using energy dispersive X-ray microanalysis, bromine has been measured from area to area and compared to measurements of sulphur, a naturally occurring element of proteoglycan. Since bromine has been combined mole for mole with toluidine blue O and it is already known that toluidine blue O combines approximately mole for mole with the glycosaminoglycans of proteoglycan, the measurement of bromine, presents an indirect measure of proteoglycan concentration. The X-ray spectral localization of sulphur presents problems in X-ray analysis which are overcome with bromine which makes this technique attractive for workers in this field.
mesh_terms: D000818:Animals; D001966:Bromine / Q000032:analysis; D004577:Electron Probe Microanalysis; D004838:Epiphyses / Q000032:analysis*; D006651:Histocytochemistry; D011509:Proteoglycans / Q000032:analysis*; D051381:Rats; D013194:Staining and Labeling; D013455:Sulfur / Q000032:analysis; D014048:Tolonium Chloride / Q000031:analogs & derivatives*
chemical_list: D011509:Proteoglycans; C028379:dibromo-toluidine blue O; D014048:Tolonium Chloride; D013455:Sulfur; D001966:Bromine