[A rapid determination of cholesterol in egg yolks using the Bio-La-Test].

A technique of direct one-stage determination of the total cholesterol content in egg yolk is proposed. Yolk samples are treated by dilution into a form suitable for a diagnostic application of the Bio-La-Test Cholesterol (manufacturer Lachema, n.e., Brno, CSSR), designed for the determination of cholesterol in blood serum. The procedure of applying the bio-assay was partly modified. Modification of the Bio-La-Test for egg yolk provides results with a methodical error of 1.5%. The time needed for sample preparation and the analysis itself does not exceed 40 minutes. It was found out by checking the proposed analytical procedure that in the egg yolk of the Hisex laying hybrid the content of cholesterol fluctuated from 1.14 to 1.41 weight percent during the laying period.