湘西原香醋紫外光谱指纹图谱特性分析

摘要

为建立湘西原香醋的化学指纹图谱鉴别方法,考察其紫外光谱指纹图谱特性。在50℃、醋：水为1：5（V/V）条件下,以真空旋转蒸发法提取香醋特征成分,于200～350nm范围内扫描醋样紫外光谱,计算不同醋样紫外光谱图谱的相似度。结果表明：同一生产批次的3个醋样的紫外光图谱相似度为0.976～0.986,具有重现性;5个不同生产日期原香醋的紫外光图谱相似度为0.975～0.985,具有稳定性;湘西原香醋与其他4种不同种类醋的紫外光图谱相似度均在0.9以下,具有特异性。这表明,湘西原香醋的紫外光谱具有指纹特性。%In order to develop a chemical fingerprint-based method for the identification of Xiangxi natural savory vinegar,its ultraviolet spectral fingerprint characteristics were investigated.The extraction of characteristic components was carried out using a vacuum rotary evaporator at 50 ℃ and a vinegar-to-water ratio of 1：5（V/V）.Vinegar samples were scanned with a ultraviolet spectrometer in the range of 200-350 nm,and the similarity of ultraviolet spectra was calculated.The results indicated that the similarities among the ultraviolet spectra of three different vinegar samples from the same production batch ranged from 0.976 to 0.986 and were reproducible.Similarities between 0.975 and 0.985 were found among the ultraviolet spectra of vinegar samples produced on 5 different dates with good stability.The similarities among the ultraviolet spectra of Xiangxi natural savory vinegar and other 4 kinds of vinegar were all below 0.9 and specific.These results suggest that the ultraviolet spectrum of Xiangxi natural savory vinegar has specific fingerprint characteristics.