对原卟啉Ⅸ（ＰｒｏｔｏｐｏｒｐｈｙｒｉｎⅨ）与蛋白质结合物的吸收、荧光的激发、发射光谱等的研究，表明了在光作用下，其可见区发光（λｍａｘ６３５ｎｍ左右）与卟啉有关，而紫外区发光（λｍａｘ４２２ｎｍ左右）与蛋白质的色氨酸残基有关，其光谱特性与临床诊断选择的癌固有荧光特征峰基本相符。该研究结果为探讨癌的发光机理积累了有益资料． Studies on the absorption of protoporphyrin IX and protein conjugates, fluorescence excitation, emission spectra and so on show that under the action of light, the luminescence in the visible region (about λ635 nm) is related to porphyrin, whereas the luminescence in the ultraviolet region λmax422nm or so) is related to the tryptophan residue of the protein, and its spectral characteristic basically agrees with the cancer-specific fluorescence peak selected by the clinical diagnosis. The results of this study for the study of cancer luminescence mechanism has accumulated useful information.