The purification procedure entailed ethyl acetate extract, silica gel column, and thin layer chromatography.

The extracts were then further purified with SPE silica gel tubes deactivated with trimethylamine.

The dimer fraction was separated by size-exclusion chromatography (SEC) after pre-fractionation on silica gel.

After removing the template by calcination, porous dehydrated silica gel nanoshells of uniform size were obtained.

Both extracts were subjected to silica gel column chromatography for isolation of main constituents, followed by purification in sephadex.

Nitenpyram and pyrasulfotole showed low recoveries for all the samples tested, probably due to low recoveries from silica gel column.

In this study, destruxin B was extracted and purified by ion-exchange chromatography, silica gel chromatography, and semipreparative high-performance liquid chromatography.

HPTLC silica gel G 60 F 254 precoated glass plates were used as the stationary phase.

Methods: The constituents were isolated and purified by silica gel and polyamide, their chemical structures were identified by physicochemcial properties and spectral methods.

The simultaneous analysis of 6-SHO and 6-GIN was carried out via RP-18 silica gel 60 F254S HPTLC plates.

To investigate the bioactivity of enzymes entrapped within stable silica gel-derived microchannels, the suggested scheme was employed to the construction of immobilized enzyme microreactor-on-a-chip.

Method: The chemical constituents were isolated and repeatedly purified by silica gel chromatography and the structures were elucidated by the NMR spectra and physicochemical properties.

In the ion-imprinting process, thorium(IV) was complexed with the carboxyl groups, then was imprinted in the polymers grafted to the silica gel surface.

Method: The compounds were extracted by 95% alcohol and isolated by column chromatography on silica gel, SephedaxLH-20 and ODS.

Photo: supplied Each handbag had two to five silica gel packs, with approximately 3.6 grams of methamphetamine hidden in most packs.

Amino polystyrene beads were used as templates, and an 8 to 10 nm thick silica gel coating was formed by the sol-gel reaction.