. 2021 Nov 19;12:762605. doi: 10.3389/fpls.2021.762605

Table 2.

Potential biomarkers of physiological metabolism.

Potential biomarkers	RT (min)	Formula	Mass Da Adduct ions	KEGG ID
L-Serine	1.32	C₃H₇NO₃	[M+H]⁺	C00065
Betaine	1.34	C₅H₁₁NO₂	[M+H]⁺	C00719
O-Phospho-L-serine	6.32	C₃H₈NO₆P	[M+H]⁺	C01005
L-Glutamate	5.22	C₅H₉NO₄	[M+H]⁺	C00025
L-Histidine	1.02	C₆H₉N₃O₂	[M+H]⁺	C00135
Carnosine	1.41	C₉H₁₄N₄O₃	[M+H]⁺	C00386