University of North Florida
Browse the Citations
-OR-

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

View Stuart Chalk's profile on LinkedIn

Rafael Cela

Abbrev:
Cela, R.
Other Names:
Rafael Cela Torrijos
Address:
Department of Analytical Chemistry, Nutrition and Bromatology, University of Santiago de Compostela, Santiago de Compostela 15706, Spain
Phone:
+34 (81) 56 31 00
Fax:
+34 (81) 54 71 41
Email:
qnrctd@usc.es

Citations 3

"Post-column Photochemical Derivatization In High-performance Liquid Chromatography"
Trends Anal. Chem. 1999 Volume 18, Issue 6 Pages 392-400
M. Lores, O. Cabaleiro and R. Cela

Abstract: Chromatographic separation techniques in combination with selective and sensitive detection systems have gained an enormous popularity in all fields of analytical chemistry. However, even with this variety of available separation-detection systems it is not always possible to achieve the desired detection limit with the necessary precision without, any analyte manipulation or derivatization, When the added reagent is light, the procedure is called photochemical reaction or photoderivatization, As for any derivatization reaction, it can be performed off-line or online with the latter being the preferred mode. Any common detector in chromatography can be used to show up the derivatization products, Both custom-built and commercial photoreactors are being used currently, enabling a great variety of derivatization schemes, each one suitable For a particular sample type. Several applications in HPLC and FIA are shown here, involving the analysis of different groups of compounds, as well as some new developments and current trends in the field,
Reactor

"Selectable-power Photoreactor For Flow Injection Analysis Systems And High Performance Liquid Chromatography Post-column Photochemical Derivatization"
J. Chromatogr. A 1996 Volume 724, Issue 1-2 Pages 55-65
M. Lores, C. M. García and R. Cela*

Abstract: The reactor consists of a commercially available knitted-tubing coil of PTFE (10 m x 0.33 mm i.d.), which is placed around an 8 W low-pressure Hg cylindrical tube lamp (General Electric G8T5), and around which are located four identical lamps arranged mutually at right-angles to each other and parallel to the first lamp. The working power of the reactor can be varied between 8 and 40 W by selecting the appropriate number of lamps to be operated and hence the optimum light power can be selected for a given analyte without inducing unwanted side reactions. The characteristics of the device were investigated for use in the post-column photoderivatization of a group of 12 phenolic aldehydes by means of HPLC and flow injection studies.
HPLC Knotted reactor Post-column derivatization Photochemistry

"Valveless Interface For Two-dimensional Reversed-phase Microchromatography (mu-RPLC)-capillary Zone Electrophoresis (CZE)"
Analusis 1999 Volume 27, Issue 5 Pages 468-471
O. Cabaleiro, M. Lores and R. Cela

Abstract: Single stage separation systems have limitations in resolving multicomponent mixtures and two-dimensional systems have higher peak capacities. A valveless interface for hyphenating Reversed-phase Microchromatography ( -RPLC) and Capillary Zone Electrophoresis (CZE) -highly orthogonal separation methods- is presented, which main innovation is a third electrode. Design and operation of the interface as well as some preliminary results obtained by combining FIA and -RPLC with CZE are shown.