Products for body hygiene containing Lapacho extracts and also quercitine and possibly other quinones present in Lapacho extracts salified or whatever modified in order to make them soluble in water are described. The preparation of the above said compounds and their use is also described.

Disclosed are a deterioration preventive agent for milk-containing foods containing as its active ingredient a coumarin analog represented by the general formula (1) below, a glycoside of that analog, or a plant extract containing the coumarin analog or its glycoside: ##STR1## (wherein R.sup.1 represents a hydrogen atom, a hydroxyl group or a methoxy group, R.sup.2 represents a hydrogen atom or a hydroxyl group, and R.sup.1 and R.sup.2 are not both hydrogen atoms). The deterioration preventive agent according to the present invention demonstrates superior deterioration preventive effects for milk-containing foods. In addition, the deterioration preventive agent provided by the present invention is friendly to the environment and people.

Disclosed are a color fading/discoloration preventive agent containing as its active ingredient a coumarin analog represented by general formula (1) below, a glycoside of that analog, or a plant extract containing the coumarin analog or its glycoside: ##STR1## (wherein R.sup.1 represents a hydrogen atom, a hydroxyl group or a methoxy group, R.sup.2 represents a hydrogen atom or a hydroxyl group, and R.sup.1 and R.sup.2 are not both hydrogen atoms); and a color fading/discoloration preventive agent containing as its active ingredient a coumarin analog mixture obtained from the rind of citrus fruit, and particularly a coumarin analog mixture obtained from citrus cold press oil.

The present invention concerns the product produced by inactivating extracellular or intracellular pathogenic virus in a biological composition without incurring substantial disruption or inactivation of cells and without significant loss of labile proteins or other valuable biological components also contained therein, the inactivation process comprising subjecting said composition to a virucidally effective amount of irradiation in the presence of (a) a mixture of a compound that quenches type I photodynamic reactions and a compound that quenches type II photodynamic reactions or (b) a bifunctional compound that is capable of quenching both type I and type II reactions, to thereby inactivate said virus while retaining functionality of said composition. The composition is advantageously subjected to the irradiation and the mixture of compounds or bifunctional compound in the presence of an irradiation sensitizer. Moreover, the process can be advantageously combined with a different virucidal method to enhance virus inactivation.