Discrimination of Pressed and Extracted Camellia Oils by Vis/NIR Spectra Combined with UVE-PLS-LDA
WEN Zhen-cai1, 4, SUN Tong2, GENG Xiang3, LIU Mu-hua2*
1. School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China 2. Optics-Electronics Application of Biomaterials Lab，Jiangxi Agricultural University，Nanchang 330045，China 3. Technical Center of Inspection and Quarantine，Jiangxi Entry-Exit Inspection and Quarantine Bureau, Nanchang 330038，China 4. Qinghai Entry-Exit Inspection and Quarantine Bureau, Xining 810000, China
Abstract：Camellia oil is a special and high quality edible oil in China, and quality of pressed camellia oils is superior to extracted camellia oils. The objective of the present research was to discriminate pressed and extracted camellia oils by visible/near infrared (Vis/NIR) spectroscopy. The transmission spectra of pressed and extracted camellia oil samples were acquired using a QualitySpec spectrometer in the wavelength range of 350~1 800 nm. Uninformative variable elimination (UVE) was used to select informative wavelength variables, and eliminate uninformative wavelength variables, then partial least squares combined with linear discriminant analysis (PLS-LDA) was used to develop classification model. At last, the classification model was used to discriminate 26 samples in the prediction set. The results indicate that UVE-PLS-LDA is an efficient discrimination and classification method, pressed and extracted camellia oils can be discriminated well by the classification model developed by UVE-PLS-LDA, the accurate rate is 100% for both samples in the calibration and prediction sets. So, Vis/NIR spectra combined with UVE-PLS-LDA is an effective method for discriminating pressed and extracted camellia oils.
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