Characterization, evaluation and in-situ cross-linking of new polar phases in capillary gas chromatography

Evaluation of 3‐aminopropyltriethoxysilane‐treated thin‐layer chromatographic plates: Application to glycyrrhetinic acid analysis

“…According to F. Geiss [a] and J. Ripphahn and H. Halpaap [9,10], the height equivalent to a theoretical plate is then given by where w is the base width of the substance peak and Zx the migration distance of the substance. The results (Tablel) indicate that the 3-APTS-treated plate allows glycyrrhetinic acid to be accurately measured with a better value for the height equivalent to a theoretical plate (H) compared to the nontreated plate.…”

Immobilization of stationary phase films by gamma radiation. Part 3. Polyethylene glycol‐type phases

“…Martinez de la Gindara eta/. [lo] reported that the addition of peroxide to the stationary phase and heat curing [9] did not always lead to high quality columns.Therefore a two-stage method was developed [lo] for the immobilization of Carbowax 2 OM; the capillary was coated first by the stationary phase and then by a layer of dicumyl peroxide (by as much as 20% of the mass of the stationary phase), and was afterwards heat cured. As an extension to our work on gamma radiation-induced immobilization of nonpolar and moderately polar stationary phases [7,8], it would be interesting to examine the possibility of gamma radiation-induced immobilization of polyethylene glycoltype stationary phases.…”

“…. Polyethylene glycol-type polar phases are widely used in chromatographic practice and their immobilization has also drawn attention [9,10]. Martinez de la Gindara eta/.…”

A two‐step method for the immobilization of stationary phases in GC capillary columns

“…The advantages of immobilized phases are solvent resistance, enhanced film stability, and decreased bleeding [l-31, although the last point is under discussion [6]. Progrless in the field is therefore continuous.…”

“…A polyol-type phase (RSL-310) has been immobilized by adding peroxides to the coating solution, using hleat curing at 15OOC [6].…”