采用傅里叶变换红外光谱(FTIR)技术,对核黄素、叶酸、维生素K1、K2这四种常见维生素在太赫兹宽频段的光谱特性进行了研究。详细分析了核黄素、叶酸、维生素K1、K2样品与聚乙烯粉末不同比例混合时的吸收光谱,将所得光谱进行比较,最后确定详实可靠的光谱图。实验结果表明:核黄素、叶酸样品浓度越大,其在高频段的吸收谱重复性越差,这证实了维生素样品的吸收率随着频率升高逐渐增加;维生素K1、K2样品由于对太赫兹波的吸收较弱,并没有出现这种特性。本研究得到的太赫兹宽频段指纹谱为维生素在太赫兹波段光谱数据库的研究提供了可靠的数据参考,同时也为快速、无损鉴定维生素类药物分子提供依据。

The research of spectral characteristics of the four following sorts of vitamins including riboflavin, folic acid and vitamin K1 and K2 in the terahertz broadband frequency range using fourier transform infrared spectrum (FTIR) technique is presented. By respectively mixing the four sorts of samples and polyethylene in different ratios, the absorption spectra of each was analyzed. Besides, absorption spectra in different ratios of the mixture were compared, thus the detailed spectrograms were presented. The results showed that the concentration increment of riboflavin and folic acid samples had negative effect on their absorption repeatability in the range of high frequency, which evidenced that the absorptivity of the vitamin samples increased with the frequency increment. However, the phenomenon did not existed in vitamin K1 and K2 because of the low absorptivity of the both. Broadband terahertz fingerprint spectra obtained in this study provide reliable data reference for vitamin in the study of terahertz spectrum database, and basis for rapid, nondestructive identification of vitamin drugs molecule.