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 in:Journal of food composition and analysis 2024-12, Vol.136, p.106812, Article 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: Article
Language:English
Subjects:
adulterated products
adulteration
algorithms
band intensity ratio
cooking fats and oils
diacylglycerol edible oil
diacylglycerols
esterification
food composition
food safety
microscopy
oil microscopy
peak area ratio
Raman spectroscopy
rapid methods
spectral analysis
triolein
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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