Neuere Ergebnisse zur Anwendung der Gras-Chromatographie

Separation efficiency versus resolution: Chiral separation of gamma lactones by capillary GC on derivatized cyclodextrin

“…Listed separation numbers, TZ, according to Kaiser [7], represent mean values for the pairs of the R and the S enantiomers of nonalactone and decalactone (in Figure 1, calculation is shown for the R-enantiomers). Resolution between enantiomers was calculated from peak widths at half height, using a correction factor of 1.18 according to Rohrschneider 181.…”

Columns: Packed and Capillary; Column Selection in Gas Chromatography

“…We also can calculate a separation number SN or Trennzahl abbreviated as TZ as another way of describing column efficiency (41). By separation number we mean the number of possible peaks that appear between two n-paraffin peaks with consecutive carbon numbers.…”

Improved separation of γ‐ and δ‐lactones on a popular phase

“…The test mixture contained racemic C6 and C8-cl2 y-lactones and C9-cl2 &-lactones, 5 mg/l each in hexane; 0.5 pl was injected on-column at 70 "C. After 60 s the oven was rapidly heated to 130 "C and the oven was then programmed at 0.9 "/min to 190 "C. The carrier gas velocity of 52 cm/s was determned by measurement of the gas hold-up time at room temperature The listed separation number, TZaccording to Kaiser [16], represents the mean value for the pairs of the R and the S enantiomers of nonalactone and decalactone. The resolution of the enantiomers, Rs was calculated from peak widths at half height, using a correction factor of 1.18 according to Rohrschneider (17,181. The order of elution of y-and &lactones was R before Sthroughout, as determined by Bernreuther et al [19].…”