Optimisation of near-infrared reflectance model in measuring protein and amylose content of rice flour

•NIRS models for protein and amylose content in rice flours were evaluated.•Multiple derivation, preprocessing and regression methods were employed.•The best models to measure protein and amylose content in rice flours were identified.•MPLS was shown to be the most robust regression method. Near-inf...

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Bibliographic Details
Published in:Food chemistry 2014-01, Vol.142, p.92-100
Main Authors: Xie, L.H., Tang, S.Q., Chen, N., Luo, J., Jiao, G.A., Shao, G.N., Wei, X.J., Hu, P.S.
Format: Article
Language:English
Subjects:
Amylose - chemistry
Amylose content
Biological and medical sciences
Calibration equation
Flour - analysis
Food toxicology
Medical sciences
NIRS
Oryza - chemistry
Plant Proteins - chemistry
Protein
Spectroscopy, Near-Infrared - methods
Toxicology
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Summary:•NIRS models for protein and amylose content in rice flours were evaluated.•Multiple derivation, preprocessing and regression methods were employed.•The best models to measure protein and amylose content in rice flours were identified.•MPLS was shown to be the most robust regression method. Near-infrared reflectance spectroscopy (NIRS) has been used to predict the cooking quality parameters of rice, such as the protein (PC) and amylose content (AC). Using brown and milled flours from 519 rice samples representing a wide range of grain qualities, this study was to compare the calibration models generated by different mathematical, preprocessing treatments, and combinations of different regression algorithm. A modified partial least squares model (MPLS) with the mathematic treatment “2, 8, 8, 2” (2nd order derivative computed based on 8 data points, and 8 and 2 data points in the 1st and 2nd smoothing, respectively) and inverse multiplicative scattering correction preprocessing treatment was identified as the best model for simultaneously measurement of PC and AC in brown flours. MPLS/“2, 8, 8, 2”/detrend preprocessing was identified as the best model for milled flours. The results indicated that NIRS could be useful in estimation of PC and AC of breeding lines in early generations of the breeding programs, and for the purposes of quality control in the food industry.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2013.07.030