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Chapter 22: Q1TY (page 564)
Measure the resolving power from the peak in Figure 22 10.
The resolving power = 30974/0.003 = 9400
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(a) To detect the drug ibuprofen by liquid chromatography– mass spectrometry, would you choose the positive or negative ion mode for the spectrometer? Would you choose acidic or neutral chromatography solvent? State your reasons.
(b)If the unfragmented ion has an intensity of 100, what should be the intensity of M+1?
Protein molecular mass from electrospray. The enzyme lysozyme 59exhibits peaks at m/z = 1789.1, 1590.4, 1301.5 and 1 193.1. Follow the procedure of Table 22-3 to find the mean molecular mass and its standard deviation.
34: What is collisionally activated dissociation? At what points in a mass spectrometer does it occur?
Explain what is meant by spectral, chemical, ionization, and isobaric interference.
33:Why does vacuum ultraviolet photoionization with |120-nmwavelength radiation produce less molecular fragmentation than
does 70 eV electron ionization?
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