Waters Micromass ZQ 2000, Руководство оператора, Страница: 117 / 133

Using the ESCi Multi-Mode Ionization Source 117
A
Figure A-12 ESCi Mode Disabled
A.2 Daidzein Test
Use the Daidzein ( Figure A-13 ) test to prepare the instrument for ESCi operation, evaluate
its performance, and determine the ratio of peak heights to the level of noise in a mass
chromatogram (signal-to-noise ratio).
Figure A-13 Daidzein (m/z = 255.2 [M + H] and 253.2 [M – H])
O
O
O H
OH