光谱学与光谱分析 |
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Pretreatment Method of Near-Infrared Diffuse Reflection Spectra Used for Sugar Content Prediction of Pears |
WANG Wei-ming1,2, DONG Da-ming1*, ZHENG Wen-gang1, ZHAO Xian-de1, JIAO Lei-zi1, WANG Ming-fei1, 2 |
1. National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China 2. School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China |
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Abstract The content of sugar is an important quality index for pears. However, the traditional sugar measurement methods are time-consuming and destructive. In the present study, the authors measured the sugar content of pears using visible and near infrared diffuse reflection spectroscopy. The pretreatment methods of multiplicative scatter correction (MSC), baseline correction, standard normal variate (SNV) transformation, and moving average algorithms were used on the original absorbance spectrum. Results indicate that the absorbance spectra after pretreatment are better than the original absorbance spectra for prediction. Partial least squares (PLS) regression was also used on the original absorbance spectrum and the absorbance spectrum after moving average and baseline correction. It follows that the forecast accuracy of the absorbance spectra after moving average is higher than that of the original absorbance spectra. The models gave good predictions of the sugar content of pears, with corresponding r values of 0.990 8, and standard errors of predictions of 0.019 0.
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Received: 2012-05-21
Accepted: 2012-09-18
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Corresponding Authors:
DONG Da-ming
E-mail: dongdm@nercita.org.cn
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