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Application of Portable Near-Infrared Spectroscopy for Quantitative Prediction of Protein Content in Torreya grandis Kernels Under Different States

Sparad:
I publikationen:Foods vol. 14, no. 11 (2025), p. 1847
Huvudupphov: Gu Yuqi
Övriga upphov: Zhong Haosheng, Wu, Jianhua, Li Kaixuan, Huang, Yu, Fang Huimin, Hassan, Muhammad, Yao Lijian, Zhao, Chao
Utgiven:
MDPI AG
Ämnen:
China
Outliers (statistics)
Data acquisition
Food
Nuts
Principal components analysis
Nitrogen
Agricultural technology
Least squares method
Feasibility studies
Statistical analysis
Prediction models
Infrared spectra
Infrared spectroscopy
Proteins
Nutrient content
Data analysis
Quality assessment
Quality standards
Spectrum analysis
Near infrared radiation
Quality control
Food processing
Particle size
Kernels
Information processing
Portability
Torreya grandis
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Abstrakt:Protein content is a key quality indicator in nuts, influencing their color, taste, storage, and processing properties. Traditional methods for protein quantification, such as the Kjeldahl nitrogen method, are time-consuming and destructive, highlighting the need for rapid, convenient alternatives. This study explores the feasibility of using portable near-infrared spectroscopy (NIRS) for the quantitative prediction of protein content in Torreya grandis (T. grandis) kernels by comparing different sample states (with shell, without shell, and granules). Spectral data were acquired using a portable NIR spectrometer, and the protein content was determined via the Kjeldahl nitrogen method as a reference. Outlier detection was performed using principal component analysis combined with Mahalanobis distance (PCA-MD) and concentration residual analysis. Various spectral preprocessing techniques and partial least squares regression (PLSR) were applied to develop protein prediction models. The results demonstrated that portable NIRS could effectively predict protein content in T. grandis kernels, with the best performance being achieved using granulated samples. The optimized model (1Der-SNV-PLSR-G) significantly outperformed models based on whole kernels (with or without shell), with determination coefficients for the calibration set (<inline-formula>Rc2</inline-formula>) and prediction set (<inline-formula>Rp2</inline-formula>) of 0.92 and 0.86, respectively, indicating that the sample state critically influenced prediction accuracy. This study confirmed the potential of portable NIRS as a rapid and convenient tool for protein quantification in nuts, offering a practical alternative to conventional methods. The findings also suggested its broader applicability for quality assessment in other nuts and food products, contributing to advancements in food science and agricultural technology.
ISSN:2304-8158
DOI:10.3390/foods14111847
Källa:Agriculture Science Database