Patent ID: 9382571
Filing Date: 2016-07-05
CPC Classification: C12Q,G01N,H01J

Claim Text:
1. A method for studying a sample containing a bacterial population of Staphylococcus aureus by a mass spectrometry technique comprising the following steps: a) placing the sample in contact with the medium allowing ionization by action of a laser beam of the molecules present in the sample, b) ionizing the molecules present in the sample by means of a laser beam, c) accelerating the ionized molecules obtained by a potential difference, d) letting the ionized and accelerated molecules freely move in at least one tube under reduced pressure, e) detecting at least one portion of the ionized and accelerated molecules which have freely moved, so as to measure the time they took for covering at least one tube under reduced pressure and for obtaining a signal corresponding to the number of detected ionized molecules at a given instant, f) calculating the mass over charge ratio [m/z] of the detected molecules, so as to obtain a signal corresponding to the number of ionized molecules of a same mass over charge ratio [m/z], depending on the m/z ratio of the detected molecules, g) determining either directly or indirectly whether the ionized molecules obtained in step b), there were or not ionized molecules of a mass/charge ratio [m/z] equal to 3005±5 Th or equal to 3035±5 Th, h) issuing a decision conditioned by the results obtained in step g).