2.4. Screening of isolates for quorum sensing and quorum sensing
inhibition activity
Bacterial isolates were screened for production of the quorum
sensing signal molecule acyl-homoserine lactones (AHL) following
the method of Moons et al. (2006). Here, the mutant Chromobacterium
violaceum CV026, which is unable to produce its own, quorum
sensing signal molecule (purple pigment violacein) but able to respond
to AHL provided by another organisms that acts as a biosensor
strain. AHL production was detected in a cross-feeding assay by
stabbing the selected antagonistic isolates onto LB agar plates
seeded with C. violaceum CV026. After an incubation of 24 h at
28 C, production of purple pigment violacein was evaluated as positive
for the test.