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The Development of Novel Antibiotics Using ... - Jacobs University

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Intens.<br />

[%]<br />

100<br />

+MS<br />

517.2<br />

Exact structure<br />

80<br />

60<br />

40<br />

1031.4<br />

20<br />

353.1<br />

0<br />

500 1000 1500 2000 2500 m/z<br />

Figure 60. Tandem ESI-MS for host-guest complex (7, 9 and 10)/19 (MS 2 for m/z 1031).<br />

Intens.<br />

[%]<br />

100<br />

80<br />

7 =<br />

9 =<br />

10 =<br />

20 =<br />

902.4520<br />

936.4069<br />

+MS<br />

60<br />

40<br />

20<br />

0<br />

775.4484<br />

876.3889<br />

924.4183<br />

775 800 825 850 875 900 925 950 975 m/z<br />

Figure 61. ESI-TOF/MS showing selective recognition <strong>of</strong> oligopeptide 19 by receptors 9 and 10.<br />

Intens.<br />

[%]<br />

100<br />

+MS<br />

388.1<br />

Exact structure<br />

80<br />

60<br />

40<br />

902.4<br />

20<br />

0<br />

313.1<br />

500 1000 1500 2000 2500 m/z<br />

Figure 62. Tandem ESI-MS for host-guest complex (7, 9 and 10)/20 (MS 2 for m/z 902).<br />

27 | S

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