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. 2022 Nov 23;13:1059104. doi: 10.3389/fmicb.2022.1059104

Table 1.

Expected molecular masses of ionic forms of intact ertapenem and its hydrolysis products.

Intact ertapenem Ertapenem hydrolysis products
MW, g/mol 475.2 [Mh + H]+ 494.2
[M + H]+ 476.2 [Mh + Na]+ 516.2
[M + Na]+ 498.1 [Mh + 2Na]+ 538.2
[M + 2Na]+ 520.1 [Mh/d + H]+ 450.2
[M + 3Na]+ 542.1 [Mh/d + Na]+ 472.2

M, intact molecule; Mh, hydrolyzed molecule; Mh/d, hydrolyzed and decarboxylated molecule.