Characterization of pyoverdine and achromobactin in Pseudomonas syringae pv. phaseolicola 1448a

BMC Microbiology

Table 4 Negative ions arising from MS/MS analysis of the m/z = 1212 pyoverdine species

Peak number	Mass	Mass difference with equivalent peak in Table 3
CHR	357.13	0
1	428.12	70.99
2	529.23	70.99
3	687.27	70.99
4	789.30	70.98
5	889.38	70.99
6	976.43	71.01
7	1107.40	70.99
Y1	1138.47	70.99

Fragmentation of the m/z = 1212 pyoverdine species resulted in identification of the following negative ions as shown in Figure 2C. The numbering and spacing of ions is identical to those listed in Table 3, but with peak 1 now representing the chromophore bearing an unknown 71 Da substituent. Y1 has the expected mass for the Y ion resulting from loss of the acyl group of the chromophore (allowing for the unknown 71 Da substituent).

ISSN: 1471-2180