Citation:
FU Dan-Dan, WANG Qiao-Hua, GAO Sheng, MA Mei-Hu. Analysis of S-Ovalbumin Content of Different Varieties of Eggs during Storage and Its Nondestructive Testing Model by Visible-Near Infrared Spectroscopy[J]. Chinese Journal of Analytical Chemistry,
;2020, 48(2): 289-297.
doi:
10.19756/j.issn.0253-3820.191329
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The visible-near-infrared (Vis-NIR) transmission spectroscopy technique was used to analyze the content of S-ovalbumin (S-ova), which had high correlation with egg freshness, and to establish a nondestructive prediction model. The visible/near-infrared fiber spectroscopy were used to collect the transmission spectrum of two varieties of eggs at 349-1000 nm, and the S-ovalbumin content of 270 eggs was measured by wet chemistry method. By comparing the average spectra of eggs of different varieties during storage, it was found that the spectral absorption peaks of different varieties of eggs had the same position, and only the spectral energy values in the visible range differed. The original spectrum was preprocessed by standard normal variate (SNV), and 67 characteristic wavelengths were extracted from the full spectrum of 500-950 nm using uninformative variables elimination (UVE). It was concluded that partial least squares (PLS) regression model based on 67 characteristic wavelengths could predict the S-ovalbumin content. To further eliminate the multi-collinearity between the characteristic wavelengths, the stepwise regression algorithm was used to perform secondary screening on the characteristic wavelengths, and finally 16 characteristic wavelengths were selected. By using the 16 characteristic wavelengths to establish a multivariate regression model, the coefficient of determination (R2) of the training set was 0.9511, the root mean square error (RMSE) was 0.0478, and the R2 of the prediction set was 0.8380. Besides, the RMSE was 0.1116, and the residual predictive deviation (RPD) was 2.2620. The general predictive model was used to predict the S-ovalbumin content of 50 eggs with Roman pink shell and 40 eggs with sea blue brown shell in the prediction set. The R2 of the predicted and measured values were 0.8119 and 0.9116, respectively, and the RMSEs were 0.1298 and 0.0834, respectively. Therefore, the general model could perform nondestructive testing on the S-ovalbumin content of these two different varieties of eggs better, and the model was more applicable. The results showed that the visible/near-infrared spectroscopy could accurately detect the S-ovalbumin content of eggs in different varieties, and the established general prediction model laid a foundation for the development of portable non-destructive testing device for protein content.
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Keywords:
- Visible-near infrared spectroscopy,
- Egg,
- S-Ovalbumin,
- Correlation,
- General model
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