Capillary coupled

Figure 12.23 SFC-SFC analysis, involving a rotaiy valve interface, of a standard coal tar sample (SRM 1597). Two fractions were collected from the first SFC separation (a) and then analyzed simultaneously in the second SFC system (h) cuts a and h are taken between 20.2 and 21.2 min, and 38.7 and 40.2 min, respectively. Peak identification is as follows 1, tii-phenylene 2, chrysene 3, henzo[g/ i]perylene 4, antliracene. Reprinted from Analytical Chemistry, 62, Z. Juvancz et al, Multidimensional packed capillary coupled to open tubular column supercritical fluid chromatography using a valve-switcliing interface , pp. 1384-1388, copyright 1990, with permission from the American Chemical Society.

Figure 12.24 Schematic diagram of the multidimensional packed capillary to open tubular column SFC-SFC system. Reprinted from Analytical Chemistry, 62, Z. Juvancz et al., Multidimensional packed capillary coupled to open tubular column supercritical fluid chromatography using a valve-switching interface , pp. 1384-1388, copyright 1990, with permission from the American Chemical Society.

Z. Juvancz, K. M. Payne, K. E. Markides and M. E. Eee, Multidimensional packed capillary coupled to open tubular column superaitical fluid chromatography using a valveswitching interface , Awa/. Chem. 62 1384-1388(1990). 

Yeung, K. K. C., Kiceniuk, A. G., and Li, L. (2001). Capillary electrophoresis using a surfactant-treated capillary coupled with offline matrix-assisted laser desorption ionization mass spectrometry for high efficiency and sensitivity detection of proteins. /. Chromatogr. A 931, 153 — 162. 

Fatty acid hydroperoxides can be separated from each other and other lipids by MEKC followed by FLD according to equation 34 with 106a, using as catalyst microperoxidase-11 immobilized on the wall of a small capillary coupled at the end of the electrophoresis track. MEKC with DA-UVD can be applied for separation of unsaturated fatty acids from the mixture of hydroperoxides obtained on oxidation with 102 . ... 

The innovative thermostated separation system published by de Bokx et al. [17] represents an interesting example and comprises a capillary cross intersection for sample injection and a 100 pi fluorescence detector cell based on fiber optics. This apparatus shows basically all features that are required to perform automated fast and efficient electrophoretic separations and has been used to separate a mixture of laser dyes in 35 seconds with moderate efficiency. However, in order to keep all dead volumes at the junctions sufficiently small, the connections had to be done by tedious laser-based drilling of holes through the capillary walls. A similar approach to interconnect capillaries was described for a postcolumn derivatization reactor for CE [18], and many more inventive capillary coupling devices have been designed. 

Riepe H. G., Gomez M., Camara C. and Bettmer J. (2000) Modification of capillaries coupled to micro-flow nebulizers a new strategy for on-line interference removal in inductively coupled plasma mass spectrometry, J Mass Spectrom 35 891-896. 

In 1988, it was shown that DNA single nucleotide separation could be achieved using cross-linked polyacrylamide gel filled capillaries coupled with U V/Vis detection [7]. These chemical gels provided... 

A TG-DTA-MS instrument was developed by the author and used in a wide range of projects, covering most classes of material. A simple capillary coupling was shown to operate with all common purge gases, and up to 1500°C. A special feature of the interface is the option to select a jet separator, which is mounted in parallel to the commoner... 

Fig. 3 Scheme of potentiostatic operation for a preparative electrolysis, using in principle a simplified cyclovoltammetry equipment. The potential of the working electrode is measured by a Luggin capillary, coupled with a reference electrode (RE, see Sect. 2.5.1.6). The control circuit in the potentiostat adjusts the cell current until the potential of the working electrode is equal to the voltage at the control input. 

TG-MS measurements were made on a TA Instruments DTA-TGA (SDT 2960) coupled with a Balzers Thermostar quadropole mass spectrometer. The quadropole mass spectrometer was conneeted to the thermobalanee via a capillary coupling. The ionizing voltage of the eross-beam eleetron impaet ionozation soiuce amounted to 70 eV and the flow rate of the purge gas (helium) was 100 cm /min. Mass of the sample was ca. 4 mg and the heating rate was 20 K/min. 

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