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. 2011 Mar 8;11:51. doi: 10.1186/1471-2180-11-51

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Copyright ©2011 Chan et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mass spectra of the AHLs produced by GG2. Extracts from spent culture supernatants of GG2 were analysed by LC-MS/MS. The fragment ion at m/z 102 is characteristic of the homoserine lactone ring (A and B). By comparison with the corresponding synthetic AHL standards (C and D) the precursor ion of m/z 298.2 and fragment ion of m/z 197.2 demonstrate the presence of 3-oxo-C12-HSL (A) whereas the precursor ion of m/z 282.2 (which corresponds to [M-H₂O]) and fragment ion of m/z 181.2 are characteristic for 3-hydroxy-C12-HSL (B). AU: Absorbance unit.