CYCLODEXTRIN DERIVATIVES IN THE GAS-CHROMATOGRAPHIC SEPARATION OF RACEMIC MIXTURES OF VOLATILE COMPOUNDS .10. HYL-6-O-TERT-BUTYLDIMETHYLSILYL-BETA-CYCLODEXTRINS AND YL-6-O-TERT-BUTYLDIMETHYLSILYL-GAMMA-CYCLODEXTRINS

2,3-Di-O-ethyl-6-O-tert.-butyldimethylsilyl-beta- and -gamma-cyclodext rins (ETTBS-beta- and -gamma-CDs) are proposed as stationary phases fo r GC separation of enantiomers. The influence of different polarity po lysiloxanes (PS-347.5, PS-086, OV-1701) as diluting phase on the separ ation capacity of these CD derivatives was also investigated. The resu lts of ETTBS-beta- and -gamma-CDs are compared to those of 2,3-di-O-me thyl-6-O-tert.-butyldimethylsilyl-beta- and -gamma-cyclodextrins (METB S-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 synt hesized CD derivatives was evaluated by analysing a number of differen t racemates with different structures.