| 光谱学与光谱分析 |
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| Rapid Identification of Potato Cultivars Using NIR-Excited Fluorescence and Raman Spectroscopy |
| DAI Fen1, 2, 3, Mads Sylvest Bergholt3, Arnold Julian Vinoj Benjamin3, HONG Tian-sheng1, 2, Zhiwei Huang3* |
1. Key Laboratory of Key Technology for South Agricultural Machinery and Equipment, Guangzhou 510642, China
2. College of Engineering, South China Agricultural University, Guangzhou 510642, China
3. Optical Bioimaging Laboratory, Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Singapore 117576 |
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Abstract Potato is one of the most important food in the world. Rapid and noninvasive identification of potato cultivars plays an important role in the better use of varieties. In this study, The identification ability of optical spectroscopy techniques, including near-infrared (NIR) Raman spectroscopy and NIR fluorescence spectroscopy, for invasive detection of potato cultivars was evaluated. A rapid NIR Raman spectroscopy system was applied to measure the composite Raman and NIR fluorescence spectroscopy of 3 different species of potatoes (98 samples in total) under 785 nm laser light excitation. Then pure Raman and NIR fluorescence spectroscopy were abstracted from the composite spectroscopy, respectively. At last, the partial least squares- discriminant analysis (PLS-DA) was utilized to analyze and classify Raman spectra of 3 different types of potatoes. All the samples were divided into two sets at random: the calibration set (74samples) and prediction set(24 samples). the model was validated using a leave-one-out, cross-validation method. The results showed that both the NIR-excited fluorescence spectra and pure Raman spectra could be used to identify three cultivars of potatoes. The fluorescence spectrum could distinguish the Favorita variety well (sensitivity: 1, specificity: 0.86 and accuracy: 0.92), but the result for Diamant (sensitivity: 0.75, specificity: 0.75 and accuracy: 0.75) and Granola (sensitivity: 0.16, specificity: 0.89 and accuracy: 0.71) cultivars identification were a bit poorer. We demonstrated that Raman spectroscopy uncovered the main biochemical compositions contained in potato species, and provided a better classification sensitivity, specificity and accuracy (sensitivity: 1, specificity: 1 and accuracy: 1 for all 3 potato cultivars identification) among the three types of potatoes as compared to fluorescence spectroscopy.
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Received: 2013-06-04
Accepted: 2013-09-12
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Corresponding Authors:
Zhiwei Huang
E-mail: biehzw@nus.edu.sg
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