Identification of solid state fermentation degree with FT-NIR spectroscopy: Comparison of wavelength variable selection methods of CARS and SCARS.
The use of wavelength variable selection before partial least squares discriminant analysis (PLS-DA) for qualitative identification of solid state fermentation degree by FT-NIR spectroscopy technique was investigated in this study. Two wavelength variable selection methods including competitive adaptive reweighted sampling (CARS) and stability competitive adaptive reweighted sampling (SCARS) were employed to select the important wavelengths. PLS-DA was applied to calibrate identified model using selected wavelength variables by CARS and SCARS for identification of solid state fermentation degree. Experimental results showed that the number of selected wavelength variables by CARS and SCARS were 58 and 47, respectively, from the 1557 original wavelength variables. Compared with the results of full-spectrum PLS-DA, the two wavelength variable selection methods both could enhance the performance of identified models. Meanwhile, compared with CARS-PLS-DA model, the SCARS-PLS-DA model achieved better results with the identification rate of 91.43% in the validation process. The overall results sufficiently demonstrate the PLS-DA model constructed using selected wavelength variables by a proper wavelength variable method can be more accurate identification of solid state fermentation degree.
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, PR China. Electronic address: h.v.jiang@hotmail.com.
Hui
H
Jiang
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Hang
H
Zhang
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China. Electronic address: q.s.chen@hotmail.com.
Quansheng
Q
Chen
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Congli
C
Mei
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Guohai
G
Liu
D000465:Algorithms; D016002:Discriminant Analysis; D005285:Fermentation; D005583:Fourier Analysis; D016018:Least-Squares Analysis; D015203:Reproducibility of Results; D019265:Spectroscopy, Near-Infrared
CARS; FT-NIR spectroscopy; SCARS; Solid state fermentation; Wavelength selection