基于植物油可见吸收光谱的相关系数鉴别特级初榨橄榄油

目前市场上的橄榄油品牌很多，质量参差不齐，亟需完善橄榄油的等级分类检测和特级初榨橄榄油的鉴别方法。可见吸收光谱光谱法可在不直接接触样品的情况下对样品进行无添加试剂的探测，因此为实现特级初榨橄榄油的鉴别，采用可见吸收光谱法对不同种类植物油进行了光谱测量。实验结果发现特级初榨橄榄油在500~780 nm波段内具有4个明显的吸收峰，而其他种类植物油在此波段内吸光度较弱或无吸收峰，且同种植物油不同品牌之间的光谱特征极其相似。采用相关系数比对不同种类植物油可见吸收光谱，分别计算了四个不同波长范围内植物油的可见吸收光谱的相关系数，实验发现不同波长范围内的植物油可见光谱相关系数差别较大。在520～700 nm范围内，特级初榨橄榄油间的光谱相关系数在0.999 6以上，特级初榨橄榄油与其他种类植物油的光谱相关系数均低于0.267 8，特级初榨橄榄油与其他等级橄榄油的光谱相关系数在0.194 6～0.835 8之间。研究结果表明可见吸收光谱相关系数法是一种快速非接触式鉴别特级初榨橄榄油的可行性方法。建立了一种特级初榨橄榄油快速鉴别方法，即可见吸收光谱相关系数法。该方法在特级初榨橄榄油的实际鉴别中具有一定的应用价值。

Distinguishing Extra Virgin Olive Oil Based on the Correlation Coefficient of Visible Absorption Spectrum of Vegetable Oil

Currently there are many brands of olive oil on the market, and the quality of olive oil is uneven, so it is an urgent need to improve the classification of olive oil classification and extra virgin olive oil identification method. Visible absorption spectroscopy can be used to detect non-added reagents without direct contact with the sample. Therefore, for the purpose of distinguishing extra virgin olive oil, the spectroscopic measurement of different kinds of vegetable oils was carried out by visible absorption spectroscopy. In order to distinguish the extra virgin olive oils, spectroscopic measurements of different kinds of vegetable oils were carried out using visible absorption spectroscopy. It was found that the extra virgin olive oil had four distinct absorption peaks in the wavelength of 500～780 nm, while other kinds of vegetable oils had weak or no absorption in this band. what’s more, the spectral characteristics of the same brand of vegetable oil were very similar. The correlation coefficients of the visible absorption spectra of vegetable oils in four different wavelength ranges were calculated, and the correlation coefficients of the visible absorption spectra of different kinds of vegetable oils were compared. The results showed that the spectral correlation coefficients of the extra virgin olive oils in the wavelength range of 520～700 nm were 0.999 6. The spectral correlation coefficients between extra virgin olive oil and other kinds of vegetable oil were lower than 0.267 8, and the correlation coefficients between extra virgin olive oil and other olive oils were between 0.194 6 and 0.835 8. The results showed that the correlation coefficient method of visible absorption spectra is a fast and non-contact method for distinguishing extra virgin olive oil. In this paper, a method for rapid identification of extra virgin olive oil was established, that is, the correlation coefficient method of visible absorption spectrum. The method has a certain application value in the actual identification of extra virgin olive oil.