Abstract
An attempt was made at composition analyses of hair dye products and foundations by utilizing computer-assisted analysis system of 13C-NMR (CMR) which had previously been developed in our laboratory. The system consists of the measurement of 13C-NMR spectrum of an unknown mixture and of subsequent computer analysis of the spectrum.
Despite the facts that hair dye products are usually composed of both large amounts of various surfactants and small quantities of labile oxidizing dyes susceptible to air and that the foundations being diverse in formulation, on the other hand, contain a lot of inorganic pigments which are not amenable to CMR, analytical results on organic components in these cosmetic products were found satisfactory, thereby indicating, when our earlier work is taken into account, that this system would be successfully applicable to composition analyses of a variety of organic mixtures as well as cosmetics.
