Racemic mixtures of twelve {common|typical|frequent|widespread|prevalent|popular} α-amino acids and {three|3} chiral drugs {were|had been|have been} tested for the separation of their enantiomers by drift tube ion mobility spectrometry (IMS)-quadrupole mass spectrometry (QMS) by introducing chiral selectors {into the|in to the} buffer gas {of the|from the|in the|on the|with the|of your} IMS instrument. (R)-α-(trifluoromethyl) benzyl alcohol, (L)-ethyl lactate, methyl (S)-2-chloropropionate, {and the|and also the|as well as the|along with the|plus the} R and S enantiomers of 2-butanol and 1-phenyl ethanol {were|had been|have been} evaluated as chiral selectors. Experimental {conditions|circumstances|situations} {were|had been|have been} varied {during|throughout|in the course of|for the duration of|through} the tests, {including|such as|which includes|like} buffer gas temperature, concentration and {type|kind|sort|variety|form} of chiral selectors, analyte concentration, electrospray (ESI) voltage, ESI solvent pH, and buffer gas flow {rate|price}. The {individual|person} enantiomers yielded {the same|exactly the same|the identical|precisely the same|the exact same} drift {times|occasions|instances} {and the|and also the|as well as the|along with the|plus the} racemic mixtures {could not|couldn’t} be separated as opposed to a {previous|prior|earlier|preceding} report (Dwivedi et al. Anal. Chem. 2006, 78, 8200). {Energy|Power} calculations {of the|from the|in the|on the|with the|of your} chiral selector –ion interactions showed that these separations are unlikely {using|utilizing|making use of|employing|working with|applying} 2-butanol as a chiral selector {but they|however they} {might|may|may well|may possibly|could|could possibly} be theoretically feasible {depending on|based on|according to} the chiral selector nature {and the|and also the|as well as the|along with the|plus the} {type|kind|sort|variety|form} of enantiomers. {Several|A number of|Numerous|Many|Various|Quite a few} plausible explanations for not succeeding {were|had been|have been} analyzed. A {critical|crucial|vital|essential|important} {review|evaluation|assessment|overview|critique} of previously claimed enantiomer separations by drift-tube IMS-MS is presented and {recommendations|suggestions} for {potential|possible|prospective} enantiomer separations by IMS are proposed. 6-Chloro-5-nitronicotinonitrile Chemical name BnO-PEG4-OH Data Sheet PMID:23775868
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