The absorption spectra of sterols from various natural sources with particular reference to ergosterol and other vitamin D precursors

Abstract
Certain marine animal sterols, notably those from lugworms (Arenicola marina), sea anemones and oysters, exhibit absorption bands identical with those of ergosterol and, calculated as such, indicate the presence of 5-12% of the absorbing substance. The lugworm sterols exhibit in addition, maxima at 346, 328 and 316 m[mu], closely comparable with those of dehydro-ergosterol.