silica gel

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sil·i·ca gel

a precipitated form of silicic acid, used for adsorption of various gases.
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References in periodicals archive ?
The fractions 1 to 8, the 3[beta]-sitosterol palmitate and iridoid 1 to 6 as references (Valladares & Rios, 2007) were co-spotted on thin layer chromatography plates (10.0 x 20.0 cm, percolated Kieselgel 60 [F.sub.254] (0.25 mm thick, Merck, Darmstadt, Germany) plates.
Analytical and preparative TLC was made on Kieselgel 60 [F.sub.254] plates with 0.2 mm and 0.5 or 1 mm layer thickness, respectively (Merck).
Open column chromatography was performed using silica gel (Kieselgel 60, Merck, Germany) and octadecylsilane (ODS) Li-Chropre RP-18 (Merck, Germany).
Thin layer chromatography was performed on Kieselgel [GF.sub.254] and visualisation was accomplished by iodine vapour or uv flame.
Product in the remaining mixture was separated via silica gel (Kieselgel 60, Merck, particle size 0.063-0.200 mm) column chromatography (15cm% 20 mm) using a dichloromethane/methanol (90/10, v/v) mixture as eluent.
Subsequently, the extract was chromatographed on a silica gel column (Merck Kieselgel 60 powder) packed with n-hexane and eluted with a gradient of n-hexane/diethyl ether to give a pure colorless oil (10.1 mg), afterward identified by [.sup.1]H-and [.sup.13]C-NMR (proton and carbon nuclear magnetic resonance), and MS (mass spectrometry) analysis as the known furnosesquiterpene tavacpallescensin (Guella et al., 1985).
Silica gel plates (Kieselgel 60 GF254, 0.1 mm thick; Merck, Darmstadt, Germany) were developed in n-hexane-ethyl acetate (9:1, vol/vol).
Progress of all reactions was monitored by thin layer chromatography (TLC) which was performed on pre-coated silica gel aluminum plates (Kieselgel 60, 254, E.
The same eluents and methylene chloride were used in the course of preparative column chromatography on silica gel (Kieselgel 60, 230-400 mesh).
Thin layer chromatography (TLC) was performed on Kieselgel G[F.sub.254] and visualization was accomplished by spraying the plates with 1% [H.sub.2]S[O.sub.4] followed by heating the plates at 150-200 [degrees]C until coloration took place.
Silica-gel chromatography was performed using kieselgel 60 (mesh 70-230).