Rapid Monitoring of Hydroxyl Value and Conjugated Linoleic Acid Content During Dehydration of Castor Oils Based on Fourier Transform Infrared Spectrometry Coupled with Chemometrics
10.19756/j.issn.0253-3820.241279
- VernacularTitle:基于傅里叶变换红外光谱和化学计量学的蓖麻油脱水过程中羟值和共轭亚油酸含量的快速监测
- Author:
Feng-Dan YAN
1
;
Yan WANG
;
Wen-Long LI
;
Pan-Pan XU
;
Dan PENG
;
Jun LI
Author Information
1. 河南工业大学粮油食品学院省部级科研平台,郑州 450001
- Keywords:
Fourier transform infrared spectrometry;
Dehydrated castor oils;
Hydroxyl value;
Conjugated linoleic acid;
Chemometrics
- From:
Chinese Journal of Analytical Chemistry
2025;53(8):1371-1379
- CountryChina
- Language:Chinese
-
Abstract:
The hydroxyl value and conjugated linoleic acid content of dehydrated castor oils are two important indicators that reflect its properties.Thus,monitoring the two indicators can better realize the industrial production of high-quality dehydrated castor oils.However,traditional chemical measurement methods have many disadvantages in determination of the two indictors,including large reagent consumption,long determination time,and cannot achieve rapid monitoring.Fourier transform infrared spectrometry(FTIR)is a new and non-destructive detection method that is low-cost and can achieve rapid detection.In this work,FTIR technique was employed to collect spectral information of dehydrated castor oils and analyze the relationship between FTIR spectral information and hydroxyl value and conjugated linoleic acid content,and a rapid detection method for detecting the property indicators of dehydrated castor oils was thus established.FTIR scanning was performed on dehydrated castor oils with a hydroxyl value of 21.9-161.4 mg KOH/g and a conjugated linoleic acid content of less than 37.5%.Among different preprocessing methods,orthogonal scatter correction(OSC)could improve the prediction accuracy of the resulting model,by which the optimal modeling data segments for hydroxyl value and conjugated linoleic acid content were 3200-3800 cm-1 and 800-1200 cm-1,respectively,and the optimal modeling method was partial least squares(PLS).The coefficients of determination of the optimal models for hydroxyl value and conjugated linoleic acid content were all above 0.99.
