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Discriminating Forchlorfenuron-treated Kiwifruits Using Portable Spectrometer and Vis/NIR Diffuse Transmittance Spectroscopy Technology

Abstract

To explore the feasibility of low-cost miniaturized spectrometers in discriminating forchlorfenuron treated kiwifruits, a visible and near infrared (Vis/NIR) diffuse transmittance spectroscopy system was constructed by a miniaturized charge coupled device (CCD) spectrometer with the wavelength range of 400-1100 nm and a self-developed optical fiber probe. Two hundred and forty spectra were acquired from the two sides about 180° apart around the equatorial position of 120 'Xuxiang' kiwifruits (including 60 forchlorfenuron-treated kiwifruits and 60 untreated kiwifruits). The spectra at the range of 500-950 nm including 2,386 wavelengths were used in this study. Successive projections algorithm (SPA) were used to select effective wavelengths (EWs). Support vector machine (SVM), extreme learning machine (ELM), and partial least squares discriminant analysis (PLS-DA) modeling methods were used to build discrimination models. The results showed that 40 EWs were selected from 2,386 full wavelengths by using SPA algorithm. The average accuracy rates of each developed model were higher than 98.1% and 88.8% for calibration set and predication set, respectively. ELM models obtained better calibration and prediction performance than SVM and PLS-DA models. The SPA-ELM model, whose discrimination accuracy rate was 100% for calibration set and 95% for predication set, was the best model for identification of forchlorfenuron-treated kiwifruits from untreated ones. This research indicates that portable detector with high accuracy on discriminating forchlorfenuron-treated kiwifruits could be developed by using cheap and miniaturized CCD spectrometer. Keywords: Vis/NIR spectroscopy; miniaturized spectrometer; forchlorfenuron-treated kiwifruits; SPA; discrimination models

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Publication details

The article was received on 28 Mar 2017, accepted on 17 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7AY00832E
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Discriminating Forchlorfenuron-treated Kiwifruits Using Portable Spectrometer and Vis/NIR Diffuse Transmittance Spectroscopy Technology

    D. Liu, Q. Li, W. Li, B. Yang and W. Guo, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY00832E

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