Abstract
DURING the past six months a further advance has been made in the purification of the gonadotropic hormones (Ï-factors, prolans) based on methods previously described, in particular the observation1 that certain coloured hormone solutions can be selectively filtered in such a way that the filtrate is strongly coloured, although possessing extremely low gonadotropic activity compared with that of the original solution. The filters most useful for this purpose were the ‘ultrafein’, ‘mittel’ and ‘fein’ filters supplied by the Membranfilter Gesellschaft of Göttingen; the first allows rather more rapid filtration, but is somewhat more porous to the active p-factors.
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References
Marshall, Quar. J. Exp. Physiol., 21, 315; 1932.
Wiesner and Marshall, ibid., 21,147; 1931.
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MARSHALL, P. Further Purification of Gonadotropic Hormones (Ï-Factors). Nature 130, 170 (1932). https://doi.org/10.1038/130170a0
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DOI: https://doi.org/10.1038/130170a0
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