Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, China.
Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics of the Chinese Academy of Sciences, Shanghai 200083, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Jan 5;206:320-327. doi: 10.1016/j.saa.2018.08.031. Epub 2018 Aug 17.
Vegetable oils provide high nutritional value in the human diet. Specifically, extra virgin olive oil (EVOO) possesses a higher price than that of other vegetable oils. Adulteration of pure EVOO with other types of vegetable oils has attracted increasing attentions. In this work, a stimulated Brillouin scattering (SBS) combined with visible absorption spectroscopy method is proposed for authentication of vegetable oils and detection of olive oil adulteration. The results provided here have demonstrated that the different vegetable oils and adulteration oils exhibit significant differences in normalized absorbance values of two relevant wavelengths (455 and 670 nm) and frequency shifts of SBS. The normalized absorbance values of all spectra at the two relevant wavelengths of 670 nm and 455 nm linearly decrease with the increase of the adulteration concentration. The Brillouin frequency shifts exponentially increase with the increase of the adulteration concentration. Due to non-destructive and requiring no sample pretreatment procedure, this method can be effectively employed for authentication and detection of oils adulteration.
植物油在人类饮食中提供了很高的营养价值。具体来说，特级初榨橄榄油（EVOO）的价格高于其他植物油。纯 EVOO 与其他类型的植物油掺假已引起越来越多的关注。在这项工作中，提出了一种受激布里渊散射（SBS）与可见吸收光谱法相结合的方法，用于验证植物油和检测橄榄油掺假。这里提供的结果表明，不同的植物油和掺假油在两个相关波长（455 和 670nm）的归一化吸收值和 SBS 的频移方面表现出显著差异。在两个相关波长 670nm 和 455nm 处所有光谱的归一化吸收值随掺假浓度的增加呈线性下降。布里渊频移随掺假浓度的增加呈指数增加。由于无损且无需样品预处理，该方法可有效用于油类掺假的鉴定和检测。
