Methods and means for characterizing antibiotic resistance in microorganisms
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United States of America Patent
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Apr 21, 2015
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Sep 19, 2013
app pub date -
Aug 19, 2010
filing date -
Aug 19, 2010
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Abstract
The present invention relates to a method for characterizing the antibiotic resistance of a microorganism, said method comprising the steps of (a) providing a reference mass spectrum of an antimicrobial compound, its enzymatic modification product, its molecular target, or of a substrate compound of a its modifying enzyme; (b) exposing a microorganism, a cell lysate thereof, or a growth medium supernatant thereof, to said antimicrobial compound or said substrate compound in aqueous liquid to thereby provide an exposed sample; (c) acquiring a mass spectrum of the exposed sample; (d) comparing the mass spectrum acquired in step c) with the reference mass spectrum of step (a), and (e) determining from said comparison whether modification of said antimicrobial compound, its modification product or its molecular target or of said substrate has occurred following said exposure, and establishing that said microorganism is potentially resistant to said antimicrobial compound when said modification is observed.
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