| 光谱学与光谱分析 |
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| Determination of Wine Original Regions Using Information Fusion of NIR and MIR Spectroscopy |
| XIANG Ling-li1, LI Meng-hua1, LI Jing-ming2*, LI Jun-hui1, ZHANG Lu-da1, ZHAO Long-lian1* |
1. Key Laboratory of Modern Precision Agriculture System Integration, Ministry of Education, China Agricultural University, Beijing 100083, China
2. College of Food Science & Nutrition Engineering, China Agricultural University, Beijing 100083, China |
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Abstract Geographical origins of wine grapes are significant factors affecting wine quality and wine prices. Tasters’ evaluation is a good method but has some limitations. It is important to discriminate different wine original regions quickly and accurately. The present paper proposed a method to determine wine original regions based on Bayesian information fusion that fused near-infrared (NIR) transmission spectra information and mid-infrared (MIR) ATR spectra information of wines. This method improved the determination results by expanding the sources of analysis information. NIR spectra and MIR spectra of 153 wine samples from four different regions of grape growing were collected by near-infrared and mid-infrared Fourier transform spectrometer separately. These four different regions are Huailai, Yantai, Gansu and Changli, which are all typical geographical originals for Chinese wines. NIR and MIR discriminant models for wine regions were established using partial least squares discriminant analysis (PLS-DA) based on NIR spectra and MIR spectra separately. In PLS-DA, the regions of wine samples are presented in group of binary code. There are four wine regions in this paper, thereby using four nodes standing for categorical variables. The output nodes values for each sample in NIR and MIR models were normalized first. These values stand for the probabilities of each sample belonging to each category. They seemed as the input to the Bayesian discriminant formula as a priori probability value. The probabilities were substituteed into the Bayesian formula to get posterior probabilities, by which we can judge the new class characteristics of these samples. Considering the stability of PLS-DA models, all the wine samples were divided into calibration sets and validation sets randomly for ten times. The results of NIR and MIR discriminant models of four wine regions were as follows: the average accuracy rates of calibration sets were 78.21% (NIR) and 82.57% (MIR), and the average accuracy rates of validation sets were 82.50% (NIR) and 81.98% (MIR). After using the method proposed in this paper, the accuracy rates of calibration and validation changed to 87.11% and 90.87% separately, which all achieved better results of determination than individual spectroscopy. These results suggest that Bayesian information fusion of NIR and MIR spectra is feasible for fast identification of wine original regions.
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Received: 2014-05-25
Accepted: 2014-07-29
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Corresponding Authors:
LI Jing-ming, ZHAO Long-lian
E-mail: zhaolonglian@aliyun.com
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