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. 2022 Mar 24;12(5):774–782. doi: 10.1016/j.jpha.2022.03.003

Table 1.

Gas chromatography with mass spectrometry (GC-MS) results of the main degradation products of glycerol and their potential reaction sources.

Impurities Retention time (min) Molecular weight (Da) Structure The potential reaction pathways
1 3.4 74 Image 1 Image 2
2 4.2 74 Image 3 Image 4
3∗ 7.2 164 Image 5 Image 6
4∗ 7.4 164 Image 7 Image 8

∗1,2-dihydroxypropionaldehyde (GLAD) and 1,3-dihydroxyacetone (DHA) are direct oxidation products of glycerol. Their contents were extremely low, so they were not detected by GC-MS. They reacted with glycerol to form impurities 3 and 4, respectively.