Analysis Model of Oleic and Linoleic Acids in Camellia Oil via Near-Infrared Spectroscopy

Fig. 4. Correlation relationships of measured and predicted values of models for two kinds of fatty acids. (a) Oleic acid samples; (b) linoleic acid samples

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Table 1. Sample configuration information

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Table 1. Sample configuration information

Sample composition	Number	Volume fraction /%
Camellia oil mixed with rapeseed oil (pressed)	1-19	3, 5, 7, 10, 13, 15, 18, 20, 25, 28, 30, 32, 35, 38, 40, 43, 45, 48, 50
Camellia oil mixed with rapeseed oil (leaching)	20-38	3, 5, 7, 10, 13, 15, 18, 20, 25, 28, 30, 32, 35, 38, 40, 43, 45, 48, 50
Camellia oil mixed with palm oil (leaching)	39-57	3, 5, 7, 10, 13, 15, 18, 20, 25, 28, 30, 32, 35, 38, 40, 43, 45, 48, 50
Camellia oil mixed with palm oil (pressed)	58-76	3, 5, 7, 10, 13, 15, 18, 20, 25, 28, 30, 32, 35, 38, 40, 43, 45, 48, 50

Table 2. Detection conditions of gas chromatograph

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Table 2. Detection conditions of gas chromatograph

Content	Parameter
Instrument model	Agilent-6890
Detector	FID
Sampler	Split
Flow rate of ${H_{2}}_{}$ /(mL·min^-1)	1
Initial temperature /℃	140
Import sample temperature /℃	260
Termination temperature /℃	240
Heating rate /(℃·min^-1)	4
Carrier gas	N₂
Split ratio	40∶1
Sample size /μL	1
Measure time /min	40

Table 3. Comparison of PLSR modeling results with different spectral preprocessing methods
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Table 3. Comparison of PLSR modeling results with different spectral preprocessing methods
Method Oleic acid Linoleic acid
R_c RMSECV R_c RMSECV
None 0.726 5.197 0.354 0.657
NWD1^st 0.733 5.105 0.669 0.622
NWD2^nd 0.701 5.444 0.546 0.740
MSC 0.985 1.086 0.950 0.171
SNV 0.985 1.096 0.949 0.173
NWD1^st-MSC 0.986 1.021 0.968 0.138

Table 4. Comparison of PLSR modeling results with two kinds of variable selection methods
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Table 4. Comparison of PLSR modeling results with two kinds of variable selection methods
Analysis object Variable selection method Number of variables R_c RMSECV
Oleic acid None 1501 0.986 1.021
VCPA 7 0.984 1.107
MCUVE 180 0.994 0.688
Linoleic acid None 1501 0.968 0.138
VCPA 8 0.987 0.089
MCUVE 500 0.989 0.080

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Yong Hao, Wenhui Wu, Qingyuan Shang, Pei Geng. Analysis Model of Oleic and Linoleic Acids in Camellia Oil via Near-Infrared Spectroscopy[J]. Acta Optica Sinica, 2019, 39(9): 0930004

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Paper Information

Category: Spectroscopy

Received: Mar. 6, 2019

Accepted: May. 14, 2019

Published Online: Sep. 9, 2019

The Author Email: Hao Yong (haonm@163.com)

DOI:10.3788/AOS201939.0930004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Sample configuration information

Table 1. Sample configuration information

Table 2. Detection conditions of gas chromatograph

Table 2. Detection conditions of gas chromatograph

Table 3. Comparison of PLSR modeling results with different spectral preprocessing methods

Table 3. Comparison of PLSR modeling results with different spectral preprocessing methods

Table 4. Comparison of PLSR modeling results with two kinds of variable selection methods

Table 4. Comparison of PLSR modeling results with two kinds of variable selection methods