期刊
FOODS
卷 11, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/foods11101502
关键词
nondestructive detection; rapid detection; full transmittance spectra; multipoint sampling; zone combination method; nectarine
资金
- National Key Research and Development Project [2019YFD 1101103]
This study investigated the effects of spectra collection orientations and regions on online soluble solid content (SSC) prediction models for peaches. The results showed that spectra collected in both orientations were suitable for prediction. Spectra from regions without peach pit provided better modeling performance.
Predicting the soluble solid content (SSC) of peaches based on visible/near infrared spectroscopy has attracted widespread attention. Due to the anisotropic structure of peach fruit, spectra collected from different orientations and regions of peach fruit will bring variations in the performance of SSC prediction models. In this study, the effects of spectra collection orientations and regions on online SSC prediction models for peaches were investigated. Full transmittance spectra were collected in two orientations: stem-calyx axis vertical (Orientation1) and stem-calyx axis horizontal (Orientation2). A partial least squares (PLS) method was used to evaluate the spectra collected in the two orientations. Then, each peach fruit was divided into three parts. PLS was used to evaluate the corresponding spectra of combinations of these three parts. Finally, effective wavelengths were selected using the successive projections algorithm (SPA) and competitive adaptive reweighted sampling (CARS). Both orientations were ideal for spectra acquisition. Regions without peach pit were ideal for modeling, and the effective wavelengths selected by the SPA led to better performance. The correlation coefficient and root mean square error of validation of the optimal models were 0.90 and 0.65%, respectively, indicating that the optimal model has potential for online prediction of peach SSC.
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