Application Fourier transform near infrared spectrometer in rapid estimation of soluble solids content of intact citrus fruits |
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| Authors: | Hui-shan Lu Hui-rong Xu Yi-bin Ying Xia-ping Fu Hai-yan Yu Hai-qing Tian |
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| Institution: | (1) School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310029, China |
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| Abstract: | Nondestructive method of measuring soluble solids content (SSC) of citrus fruits was developed using Fourier transform near
infrared reflectance (FT-NIR) measurements collected through optics fiber. The models describing the relationship between
SSC and the NIR spectra of citrus fruits were developed and evaluated. Different spectra correction algorithms (standard normal
variate (SNV), multiplicative signal correction (MSC)) were used in this study. The relationship between laboratory SSC and
FT-NIR spectra of citrus fruits was analyzed via principle component regression (PCR) and partial least squares (PLS) regression
method. Models based on the different spectral ranges were compared in this research. The first derivative and second derivative
were applied to all spectra to reduce the effects of sample size, light scattering, instrument noise, etc. Different baseline
correction methods were applied to improve the spectral data quality. Among them the second derivative method after baseline
correction produced best noise removing capability and yielded optimal calibration models. A total of 170 NIR spectra were
acquired; 135 NIR spectra were used to develop the calibration model; the remaining spectra were used to validate the model.
The developed PLS model describing the relationship between SSC and NIR reflectance spectra could predict SSC of 35 samples
with correlation coefficient of 0.995 and RMSEP of 0.79 °Brix.
Project supported by New Century Excellent Talents in University (No NCET-04-0524), and the Research Fund for the Doctoral
Program of Higher Education (No. 20030335060) of China |
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| Keywords: | FT-NIR spectroscopy Soluble solids content Intact citrus Partial least squares analysis Reflectance mode |
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