From: Sengen Sun (sengensun$##$yahoo.com)
Date: Fri Nov 10 2006 - 14:44:54 EST
> 1.What is the difference between Positive and
> Negative mode and what we found in it in LC-MS?
Positive mode is that a proton ia added to a molecule
to give MH+ (an ion peak with M.W.+1)
Negative mode is that a proton is removed from a
molecule to give a peak of (M.W.-1)-.
> 2.Can we find mass of the compund of unpure
> compound i.e 70% purity.
It depends on the stability of your ionized molecules
not on purity. Amines generally give strong MH+ while
acids give strong (M-H)-. Very stable ions can be well
detected below 1% purity.
> 3.Is MS and LC-MS interpetation is same?
MS can give one spectrum of all peaks of the ions for
a whole sample.
LC-MS can in general resolve each component for a
mixture, i.e., a spectrum for each component.
If you have a pure compound, MS and LC-MS
interpetation should be the same.
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