| 光谱学与光谱分析 |
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| Fast Discrimination of Edible Vegetable Oil Based on Raman Spectroscopy |
| ZHOU Xiu-jun, DAI Lian-kui*, LI Sheng |
| State Key Lab of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China |
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Abstract A novel method to fast discriminate edible vegetable oils by Raman spectroscopy is presented. The training set is composed of different edible vegetable oils with known classes. Based on their original Raman spectra, baseline correction and normalization were applied to obtain standard spectra. Two characteristic peaks describing the unsaturated degree of vegetable oil were selected as feature vectors; then the centers of all classes were calculated. For an edible vegetable oil with unknown class, the same pretreatment and feature extraction methods were used. The Euclidian distances between the feature vector of the unknown sample and the center of each class were calculated, and the class of the unknown sample was finally determined by the minimum distance. For 43 edible vegetable oil samples from seven different classes, experimental results show that the clustering effect of each class was more obvious and the class distance was much larger with the new feature extraction method compared with PCA. The above classification model can be applied to discriminate unknown edible vegetable oils rapidly and accurately.
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Received: 2012-01-15
Accepted: 2012-04-21
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Corresponding Authors:
DAI Lian-kui
E-mail: lkdai@iipc.zju.edu.cn
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