Fig. 6

The MS2 spectrum of quinolinic acid. UHPLC-MS-MS was performed to identify the quinolinic acid in L. mesenteroides-fermented milk. A peak at the retention time of 5.22Â min in the UHPLC spectrum was subjected to MS-MS analysis. Two peaks (red squares) at MS2 spectrum with experimental m/z values at 122.0624 and 166.0160 well matched to theoretical m/z values at 122.0248 and 166.0146 of quinolinic acid, respectively