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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2007, Vol. 8 Issue (2): 105-110    DOI: 10.1631/jzus.2007.B0105
Biotechnology     
Measurement of soluble solids content in watermelon by Vis/NIR diffuse transmittance technique
TIAN Hai-qing, YING Yi-bin, LU Hui-shan, FU Xia-ping, YU Hai-yan
School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
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Abstract  Watermelon is a popular fruit in the world with soluble solids content (SSC) being one of the major characteristics used for assessing its quality. This study was aimed at obtaining a method for nondestructive SSC detection of watermelons by means of visible/near infrared (Vis/NIR) diffuse transmittance technique. Vis/NIR transmittance spectra of intact watermelons were acquired using a low-cost commercially available spectrometer operating over the range 350~1000 nm. Spectra data were analyzed by two multivariate calibration techniques: partial least squares (PLS) and principal component regression (PCR) methods. Two experiments were designed for two varieties of watermelons [Qilin (QL), Zaochunhongyu (ZC)], which have different skin thickness range and shape dimensions. The influences of different data preprocessing and spectra treatments were also investigated. Performance of different models was assessed in terms of root mean square errors of calibration (RMSEC), root mean square errors of prediction (RMSEP) and correlation coefficient (r) between the predicted and measured parameter values. Results showed that spectra data preprocessing influenced the performance of the calibration models. The first derivative spectra showed the best results with high correlation coefficient of determination [r=0.918 (QL); r=0.954 (ZC)], low RMSEP [0.65 °Brix (QL); 0.58 °Brix (ZC)], low RMSEC [0.48 °Brix (QL); 0.34 °Brix (ZC)] and small difference between the RMSEP and the RMSEC by PLS method. The nondestructive Vis/NIR measurements provided good estimates of SSC index of watermelon, and the predicted values were highly correlated with destructively measured values for SSC. The models based on smoothing spectra (Savitzky-Golay filter smoothing method) did not enhance the performance of calibration models obviously. The results indicated the feasibility of Vis/NIR diffuse transmittance spectral analysis for predicting watermelon SSC in a nondestructive way.

Key words： Diffuse transmittance      Visible/near infrared      Nondestructive detection      Soluble solids content      Watermelon     
Received: 28 February 2006     
CLC:  TP722.5  
  TS201.2  
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TIAN Hai-qing
YING Yi-bin
LU Hui-shan
FU Xia-ping
YU Hai-yan
Cite this article:

TIAN Hai-qing, YING Yi-bin, LU Hui-shan, FU Xia-ping, YU Hai-yan. Measurement of soluble solids content in watermelon by Vis/NIR diffuse transmittance technique. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2007, 8(2): 105-110.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2007.B0105     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2007/V8/I2/105

[1] Kim-seng Chia, Herlina Abdul Rahim, Ruzairi Abdul Rahim. Neural network and principal component regression in non-destructive soluble solids content assessment: a comparison[J]. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2012, 13(2): 145-151.
[2] LU Hui-shan, XU Hui-rong, YING Yi-bin, FU Xia-ping, YU Hai-yan, TIAN Hai-qing. Application Fourier transform near infrared spectrometer in rapid estimation of soluble solids content of intact citrus fruits[J]. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2006, 7(10): 3-.