Use of Attenuated Total Reflectance Mid‐Infrared Spectroscopy for Rapid Prediction of Amino Acids in Chinese Rice Wine

Abstract

The high content of amino acids of Chinese rice wine (CRW), especially essential amino acids makes it a food increasingly demanded by consumers. Rapid detection technique of amino acid content, which is an important quality and function index of CRW, is highly desirable for consumers, producers as well as administrative authorities. In this study, the potential of Fourier transform infrared spectroscopy (FT-IR) as a novel and rapid analytical technique to determine 17 free amino acids in CRW were investigated. Genetic algorithms (GA) and synergy interval partial least squares (SiPLS) were used to select the most efficient spectral variables to improve the prediction precision of the classic partial least squares (PLS) model constructed on the full-spectrum. The results demonstrated that compared with the PLS model using all wavelengths of FT-IR spectra, the prediction precision of model based on the spectral variables selected by GA and SiPLS was significantly improved, especially for arginine and proline. After systemic comparison and discussion, it was found that GA-SiPLS model achieved the best performance, with the correlation coefficient in calibration (R(2) (cal)) higher than 0.80 and the residual predictive deviation higher than 2.00 for all of the free amino acids analyzed in this study. The overall results confirmed that FT-IR combined with efficient variable selection algorithms is a method that may be useful to replace the traditional methods for routine analysis of free amino acids in CRW.

Isolation, purification, characterization, and immunomodulatory effects of polysaccharide from Auricularia auricula on RAW264.7 macrophages

“…It is well known that FT‐IR spectroscopy can measure the structure of polysaccharides, such as the monosaccharide types, glycosidic bonds, and functional groups (Yang & Zhang, 2009). At the same time, FT‐IR can also be used to evaluate the molecular vibrations and the polar bonds between different atoms (Wu et al., 2015). The results of the characteristic absorptions of AAP, such as peaks at 3,390.87, 2,924.17, 1,619.11, 1,423.65, and 1,071.95 cm −1 (Chai & Zhao, 2016; Liu et al., 2016), are shown in Figure 5.…”

Rapid detection of talcum powder in tea using FT-IR spectroscopy coupled with chemometrics

“…Therefore, chemometric methods play a particularly important role in wavenumbers selection. In order to improve the accuracy of model and reduce the modeling time, more and more wavenumbers selection methods were reported nowadays, such as, regression coefficient analysis (RCA) 17 , Genetic algorithm (GA) 18 and random forests (RF) 19 . In this research, a hybrid wavenumbers selection method, which combined backward interval partial least squares (biPLS) regression 20 , competitive adaptive reweighted sampling (CARS) algorithm 21 and successive projections algorithm (SPA) 22 , was applied for IR spectral wavenumbers selection.…”

Evaluation of Near-Infrared and Mid-Infrared Spectroscopy for the Determination of Routine Parameters in Chinese Rice Wine

“…Meanwhile, a total of 17 amino acids, 11 parameters related to sugar content and acidity, and total antioxidant capacity and total phenolic, were quantified by MIR method (Wu et al . ; Shen et al . ; Wu et al .…”