[Study on three-dimensional fluorescence spectra of Yanghe classical distilled spirits]

In the present paper, the liquors of Hai zhi lan, Tian zhi lan and Meng zhi lan were selected as the objects, and by using equipment of UV-240 ultra-violet spectrophotometer and Sp-2558 multifunctional spectrometer, their absorption and three-dimensional fluorescence spectra induced by UV light were studied respectively. The maximum absorption wavelengths for all of them were located at 212 and 275 nm, but each has different intensity at 212 nm. Moreover, their three-dimensional fluorescence spectra were detected when they were induced by suitable UV-light, The results show that each of the spirits can emit three strong fluorescence lines at 310, 420 and 610 nm respectively when excited by UV-light at 245 nm. Furthermore, we found each of them can emit another two strong fluorescence lines when they absorb the UV-light at 310 and 345 nm. The authors found that they all have five different fluorescence peaks, but each has different intensity. According to the experimental phenomenon, through a careful analysis, it is pointed out that the differences of the five fluorescence peaks basically reflect the aging process and different content of the liquor. The three different brand yanghe classical liquors were identified fast and accurately. The paper also offered a kind of way to determine the quality and brand of white spirit.