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Open AccessArticle

Identification of Rice Varieties and Transgenic Characteristics Based on Near-Infrared Diffuse Reflectance Spectroscopy and Chemometrics

by Yong Hao 1,*, Pei Geng 1, Wenhui Wu 1, Qinhua Wen 1 and Min Rao 2
1
School of Mechatronics & Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
2
Ganzhou Entry-Exit Inspection and Quarantine Bureau, Ganzhou 341000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Molecules 2019, 24(24), 4568; https://doi.org/10.3390/molecules24244568
Received: 29 October 2019 / Revised: 29 November 2019 / Accepted: 10 December 2019 / Published: 13 December 2019
Background: In recent years, genetically modified technology has developed rapidly, and the potential impact of genetically modified foods on human health and the ecological environment has received increasing attention. The currently used methods for testing genetically modified foods are cumbersome, time-consuming, and expensive. This paper proposed a more efficient and convenient detection method. Methods: Near-infrared diffuse reflectance spectroscopy (NIRDRS) combined with multivariate calibration methods, including principal component analysis (PCA), partial least squares discriminant analysis (PLS-DA), and support vector machines (SVM), were used for identification of different rice varieties and transgenic (Bt63)/non-transgenic rice. Spectral pretreatment methods, including Norris–Williams smooth (NWS), standard normal variate (SNV), multiplicative scatter correction (MSC), and Savitzky–Golay 1st derivative (SG 1st-Der), were used for spectral noise reduction and effective information enhancement. Accuracy was used to evaluate the qualitative discriminant models. Results: The results showed that the SG 1st-Der pretreatment method, combined with the SVM, provided the optimal model to distinguish different rice varieties. The accuracy of the optimal model was 98.33%. For the discrimination model of transgenic/non-transgenic rice, the SNV-SVM model, MSC-SVM model, and SG 1st-Der-PLS-DA model all achieved good analysis results with the accuracy of 100%. Conclusion: The results showed that portable NIR spectroscopy combined with chemometrics methods could be used to identify rice varieties and transgenic characteristics (Bt63) due to its fast, non-destructive, and accurate advantages. View Full-Text
Keywords: portable near-infrared reflectance spectroscopy (NIRDRS); rice varieties; transgenic rice; partial least squares discriminant analysis (PLS-DA); support vector machines (SVM) portable near-infrared reflectance spectroscopy (NIRDRS); rice varieties; transgenic rice; partial least squares discriminant analysis (PLS-DA); support vector machines (SVM)
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Hao, Y.; Geng, P.; Wu, W.; Wen, Q.; Rao, M. Identification of Rice Varieties and Transgenic Characteristics Based on Near-Infrared Diffuse Reflectance Spectroscopy and Chemometrics. Molecules 2019, 24, 4568.

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