抄録
Highly interesting facts are observed concerning the chemical structure of serine and threonine, these two amino acids, which account for a relatively large part of the free amino acids, present in the stratum corneum of the epidermis.
Serine and threonine, quite simple as they are in chemical structure, contain in their molecules three active atomic groups, namely, the alcholic hydroxyl, the carboxyl and the amino group.
The presence of these amino acids in the stratum corneum presumably has an important role, both biochemically and physicochemically, considering from the physiology of the epidermis.
To incorporate physiological considerations into the preparation of treatment cosmetics is to introduce a new concept into the conventional cosmetics, which in turn maks it possible systematically to show the proper way how to make and use treatment cosmetics.
Since treatment cosmetics are used primarily for the purpose of maintaining the homeostasis of the skin, they must be such quality as ensure a high degree of equilibrium of the Biological Trio (Sweat, sebum and keratinization products) on the skin surface. However the Trio, which exist as vital phenomenon, is not always found in a equilibrium. The Trio frequetly tend to lose harmony. This is the very reason why treatment cosmetics prepared on the basis of the Biological Trio principle are necessary.
Treatment cosmetics are not make-up or medicines, but foods for the skin. The ideal treatment cosmetics, it might be said, keep the vital phenomenon of the skin in their natural state.
