抄録
The yellowing work of H2O2 produced by exposing aqueous tyrosine, tryptphane and their mixed solutions to light was studied.
First, from the spectro-trasmittance of these amino acid solutions added and without H2O2 in advance, exposed to the light emitted by the weather meter for various time intervals, the dominant wavelengths corresponding to hue of these solutions was determined.
As the results, the dominant wavelengths of these solutions with H2O2 were similar to these without H2O2. In regard to the yellowing speed of the mixed solutions with H2O2, the empirical formula as to function existing between percentage transmittance T (%) or luminosity Y (%) and exposure time t (hr) is well represented by our familiar formula of the mixed solution without H2O2, that is, T (Y)=a (t-k)-b. But in this case the additional constant k equals zero. And so, as soon as it is exposed to the light it makes an appearance of color. Next, the produced quantities of H2O2 and the yellowing by exposing of these amino acid solutions to light for various time intervals were examined.
In consequence, H2O2 yields are closely connected with the yellowing degree, induction periods and photosensitization of these solutions. Accordingly the yellowing of tyrosine and tryptphane series by light are dominated by H2O2 yield as the initiator of coloring.
