光谱学与光谱分析 |
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Discrimination of Donkey Meat by NIR and Chemometrics |
NIU Xiao-ying1, SHAO Li-min2, DONG Fang1, ZHAO Zhi-lei1, ZHU Yan1 |
1. College of Quality and Technical Supervision, Hebei University, Baoding 071002, China 2. College of Mechanical and Electrical Engineering, Agricultural University of Hebei, Baoding 071001, China |
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Abstract Donkey meat samples (n=167) from different parts of donkey body (neck, costalia, rump, and tendon), beef (n=47), pork (n=51) and mutton (n=32) samples were used to establish near-infrared reflectance spectroscopy (NIR) classification models in the spectra range of 4 000~12 500 cm-1. The accuracies of classification models constructed by Mahalanobis distances analysis, soft independent modeling of class analogy (SIMCA) and least squares-support vector machine (LS-SVM), respectively combined with pretreatment of Savitzky-Golay smooth (5, 15 and 25 points) and derivative (first and second), multiplicative scatter correction and standard normal variate, were compared. The optimal models for intact samples were obtained by Mahalanobis distances analysis with the first 11 principal components (PCs) from original spectra as inputs and by LS-SVM with the first 6 PCs as inputs, and correctly classified 100% of calibration set and 98.96% of prediction set. For minced samples of 7 mm diameter the optimal result was attained by LS-SVM with the first 5 PCs from original spectra as inputs, which gained an accuracy of 100% for calibration and 97.53% for prediction. For minced diameter of 5 mm SIMCA model with the first 8 PCs from original spectra as inputs correctly classified 100% of calibration and prediction. And for minced diameter of 3 mm Mahalanobis distances analysis and SIMCA models both achieved 100% accuracy for calibration and prediction respectively with the first 7 and 9 PCs from original spectra as inputs. And in these models, donkey meat samples were all correctly classified with 100% either in calibration or prediction. The results show that it is feasible that NIR with chemometrics methods is used to discriminate donkey meat from the else meat.
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Received: 2014-05-18
Accepted: 2014-07-22
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Corresponding Authors:
NIU Xiao-ying
E-mail: xiaoyingniu@126.com
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