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由于地沟油的成分含量复杂性和不定量性,导致了现有的单一检测方法不能同时满足快速和准确的辨认。荧光光谱具有高灵敏度和分辨率的特性,由此提出了一种利用荧光光谱快速检测食用油中是否掺有地沟油的新方法。将花生油分成7组,每组油所含的地沟油的比例不同,用220 nm到800 nm的激发和发射光检测各组样品油,收集其荧光数据后做归一化处理进行分析。在荧光实验中,特别是在365 nm和720 nm激发波长波段和434 nm发射波长波段,样品油的荧光强度与所含地沟油的体积分数大小明显成反比,当地沟油的体积分数大于5%时,荧光强度的衰减更为明显。结果证明了荧光光谱法检测地沟油的可行性,而且步骤更为简单。利用荧光光谱的非接触和高灵敏度的优势,能够更为简便地检测到加入了5%以上地沟油的花生油。
Due to the complexity and non-quantitative nature of the composition of the waste oil, the existing single detection methods can not simultaneously meet the requirements of rapid and accurate identification. Fluorescence spectroscopy has the characteristics of high sensitivity and resolution. Therefore, a new method for rapid detection of cooking oil in cooking oil by fluorescence spectroscopy is proposed. The peanut oil was divided into 7 groups, each group of oil containing different proportions of waste oil, with 220 nm to 800 nm excitation and emission of light detection of each group of samples of oil, the fluorescence data collected after doing normalized analysis. In fluorescence experiments, especially in the 365 nm and 720 nm excitation wavelength bands and the 434 nm emission wavelength bands, the fluorescence intensity of the sample oil is obviously inversely proportional to the volume fraction of the waste oil contained in the sample. When the volume fraction of the waste oil is more than 5% Fluorescence intensity decay is more pronounced. The result proves the feasibility of fluorescence spectroscopy in detecting waste oil, and the steps are simpler. Using the non-contact and high-sensitivity fluorescence spectroscopy, peanut oil with more than 5% cooking oil can be more easily detected.