Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1987-08-20
1989-04-18
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250304, 250339, 356 38, 422 70, 436 46, G01N 2101, G01N 128, G01N 110
Patent
active
048230090
ABSTRACT:
Effluent from a liquid chromatograph (LC) is deposited onto a deposition medium having a deposition surface inert to the LC effluent elevated above and parallel to a planar IR reflective front surface, preferably driven so as to define a continuous sample track in a generally circular, spiral or raster pattern. In the preferred embodiment, the deposition medium is a plate of germanium inert to aqueous and nonaqueous solvents, thicker than the longester IR wavelength of interest and having an undercoating of aluminum. Effluent is preferably deposited in a spiral pattern on the deposition medium in the form of a rotating disk. After collection, the reflection spectra can be interrogated by Fourier transform IR spectroscopy. The same collection technique can be used to collect and mount samples for mass spectrometry. To promote solvent evaporation, the effluent discharge is enveloped by a stream of heated nitrogen, particularly beneficial for reversed phase chromatography. By varying the temperature of the stream as a function of the proportions of solvents of differing volatility, the compatibility of gradient elution with surface deposition techniques is improved.
REFERENCES:
patent: 3496102 (1970-02-01), Dahl et al.
patent: 3924947 (1975-12-01), Hogg
patent: 4552723 (1985-11-01), Adams et al.
Smith et al., "Deposition Method for Moving Ribbon Liquid Chromatograph-Mass Spectrometer Interfaces", Anal. Chem, vol. 53, pp. 739-740 (1981).
Harrick, Internal Reflection Spectroscopy, pp. 25-27 (1979).
Greenler, "Infrared Study of Adsorbed Molecules on Metal Surfaces by Reflection Techniques", Journal of Chem Phys. vol. 44, pp. 310-315 (Jan. 1966).
Biemann Klaus
Gagel John J.
Hannaher Constantine
Howell Janice A.
Massachusetts Institute of Technology
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