Putative assignment of (M + H)+ and (M − H)− peaks in biofilms grown on ITO-coated glass for the quinolones HHQ (C16H22NO), PQS (C16H21NO2), and NHQ (C18H25NO)

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Putative assignment of (M + H)+ and (M − H)− peaks in biofilms grown on ITO-coated glass for the quinolones HHQ (C16H22NO), PQS (C16H21NO2), and NHQ (C18H25NO) in positive-ion (A) and negative-ion (B) modes. Putative assignment of (M + H)+ and (M − H)− peaks in biofilms grown on ITO-coated glass for the quinolones HHQ (C16H22NO), PQS (C16H21NO2), and NHQ (C18H25NO) in positive-ion (A) and negative-ion (B) modes. We observed peaks for PQS and NHQ in infected pig bronchus samples in positive-ion mode (C) in HCBM and in low mass resolution imaging mode, BAM (D). PQS and NHQ were present in infected samples (red) but not in mock-infected control samples (black). Sarah K. Davies et al. mSphere 2017; doi:10.1128/mSphere.00211-17