Cyclodextrin derivatives in the gas chromatographic separation of racemic mixtures of volatile compounds .10. 2,3-Di-O-ethyl-6-O-tert-butyldimethylsilyl-beta- and -gamma-cyclodextrins

2,3-Di-O-ethyl-6-O-tert.-butyldimethylsilyl-beta- and -gamma-cyclodextrins (ETTBS-beta- and -gamma-CDs) are proposed as stationary phases for GC separation of enantiomers. The influence of different polarity polysiloxanes (PS-347.5, PS-086, OV-1701) as diluting phase on the separation capacity of these CD derivatives was also investigated. The results of ETTBS-beta- and -gamma-CDs are compared to those of 2,3-di-O-methyl-6-O-tert.-butyldimethylsilyl-beta- and -gamma-cyclodextrins (METBS-beta- and -gamma-CDs). The advantages of ETTBS-beta- and -gamma-CDs in terms of minimum operative temperatures and separation capacity of the column are discussed. Each column coated with each of the new synthesized CD derivatives was evaluated by analysing a number of different racemates with different structures.