Abstract
A technically simple method is described for the preparation of purified bovine luteinizing hormone. Preparations are attained which contain 1.05 and 1.69 units/mg when assayed in terms of NIH-LH-Sl by the ovarian ascorbic acid depletion assay of Parlow. Thyroid-stimulating hormone contamination is low, and no contamination with follicle- stimulating hormone could be detected when the material was tested at a total dose of 8 mg by the HCG-augmentation method of Steelman and Pohley.