“…For trace amounts of protein, measurement of the quenching of Eosin Y fluorescence has been proposed (209). Lipoprotein fractions separated by electrophoresis can be determined by fluorescence intensity readings, after staining with protoporphyrin IX (425); similarly, total phospholipides from tissue have been determined fluorometrically, after complexing with Rhodamine 6G (190). A quantitative microfluorometric technique was described for analysis of lipide fractions isolated from a mvcobacterium (390).…”