Abstract
The examination of the fluorescent substances in the blood by rabbit blood has made clear the fluorescent substances found in it. Five kinds of fluorescent substances are found in the blood besides riboflavin. The investigation has been pursued with the application of spot colour reaction derived from paper partition chromatography, spector examination, contrivance of development solvent and bioassay. The result has shown that folic acid derivative in violet fluorescent substance, 3-hydroxykynurenine in yellow-green fluorescent substance, kynurenine in blue fluorescent substance and protoporphyrin in red-brown fluorescent substance have been identified. In yellow-brown fluorescent substance, a substance which seems to have a relation with protoporphyrin has been presumed.
