Rapid method for identifying diacylglycerol edible oils using Raman spectroscopy combined with the “oil microscopy” method

This study aims to identify diacylglycerol (DAG) edible oils using Raman spectroscopy to protect consumers. Raman spectral data from 28 samples were collected, including DAG (1,3-diolein), triacylglycerol (triolein), DAG edible oils, adulterated oils, and ordinary edible oils. These samples were ana...

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Bibliographic Details
Published inJournal of food composition and analysis Vol. 136; p. 106812
Main Authors Liu, Lingli, Hua, Yisheng, Li, Yuanpeng, Liu, Rui, Zeng, Rui, Xue, Mengjiao, Chen, Meiyuan, Huang, Wenchang, Luo, Youhuan, Tang, Jian, Tu, Shan, Liu, Jun, Hu, Junhui
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.12.2024
Subjects
adulteration
band intensity ratio
diacylglycerol edible oil
oil microscopy
peak area ratio
Raman spectroscopy
peak area ratio
band intensity ratio
adulteration
LDA
KNN
DAG
TAG
Raman spectroscopy
diacylglycerol edible oil
oil microscopy
PCA
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Summary:This study aims to identify diacylglycerol (DAG) edible oils using Raman spectroscopy to protect consumers. Raman spectral data from 28 samples were collected, including DAG (1,3-diolein), triacylglycerol (triolein), DAG edible oils, adulterated oils, and ordinary edible oils. These samples were analyzed using a combined linear discriminant analysis–k nearest neighbors algorithm, characteristic band ratios, peak area ratios, and oil microscopy. The results of Raman spectroscopy analysis demonstrated DAG edible oils, adulterated oil, and ordinary cooking oil at 1746 cm−1 with Iordinary edible oil >Iadulterated oil >IDAG edible oil. Further analyses revealed differences in esterification between DAG edible oils and triacylglycerol. Moreover, the results demonstrated that the combination of Raman spectroscopy and oil microscopy can quickly and accurately detect DAG edible oil adulteration, which is expected to be an effective tool for food safety regulation to protect consumers’ rights. •Diacylglycerol (DAG) oil shows a blue shift at 1746 cm−1.•DAG oil shows lower esterification than triacylglycerol (TAG) oil.•Band intensity and peak area ratios distinguish DAG, TAG, and adulterated oil.•Oil mirror analysis revealed structural changes, aiding comprehensive oil analysis.
ISSN:0889-1575
DOI:10.1016/j.jfca.2024.106812