A simple and efficient cryogenic trapping device for odor evaluation of aroma fractions

✍ Scribed by Adam, S. T.

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 289 KB
• Volume: 10
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240100613

✦ Synopsis

Short Communications

specific detectors in parallel with the mass spectrometer while using the open-split interface provides for more definitive analyses.

The choice of the open-split over the direct-coupled GC to MS interface implies a trade-off in advantages and disadvantages which may be more or less important depending on the operation of each laboratory. The advantages of the open-split interface include: (1) good reliability, (2) complete isolation of the column from the vacuum-hence the vacuum need not be interrupted to change columns, the column parameters and solute selectivities are independent of mass spectrometer operation thus providing maximum efficiency, and wider bore (0.32 mm) FSWCOT columns may be more conveniently used; and (3) the possibility of using specific GC detectors in parallel with the MS to provide more 1067W10679 qualitative information about the sample. Its disadvantages include: (1) variable yield into the MS during temperature-programmed GC analyses, making direct quantitation of samples impractical; (2) relatively sophisticated to use, necessitating an experienced operator; (3) higher detection limits; and (4) longer analysis times. A recent publication [2] has described a single piece of hardware which provides alternate GUMS operating modes, including open-split, direct couple, and shut off.

References

[I] G. Schomburg, J. Chrornatogr. 167 (1978) 139140141142143144145146147[2] E.