Irradiated Milk: the Energy Requirements for Antirachitic Activation
نویسنده
چکیده
The irradiation of milk is a complex problem from the physical, optical, and photochemical standpoint. The knowledge concerning the antirachitic activation of pure sterols with ultra-violet radiation cannot be applied directly to milk for several reasons. The provitamin or activatable substance as it exists in milk is associated with other materials in solution and suspension. Such substances may act as internal optical filters and absorb part of the radiations that might otherwise activate the provitamin. The provitamin as it exists in milk is possibly not a pure sterol; it may exist in a complex combination with lipoids and other compounds which might affect its photochemical sensitivity. Laboratory and commercial experience has indicated that ultraviolet radiation which has been used for activation of pure sterols is useful for activating milk antirachitically. A review of the published data concerning milk irradiation shows that exposure periods in various laboratories have varied from a few seconds to as long as 2 hours (l-5). While the available data show that such milks have a measurable degree of antirachitic potency, the extreme variations in the period of exposure indicate an obvious lack of standardization in the technique of irradiating milk. The factors involved are the composition of the milk, the method of
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تاریخ انتشار 2003