- Improved chemical stabilities for end-capped high performance liquid chromatography stationary phases based on poly(methyloctadecylsiloxane) thermally immobilized onto metalized silicas.
Improved chemical stabilities for end-capped high performance liquid chromatography stationary phases based on poly(methyloctadecylsiloxane) thermally immobilized onto metalized silicas.
Journal of chromatography. A (2012-09-12)
Carla G A da Silva, Carol H Collins
PMID22964048
RESUMEN
Endcapped stationary phases were prepared after thermal immobilization of poly(methyloctadecylsiloxane) (PMODS) onto zirconized and titanized silica supports. These new stationary phases have lower densities of residual hydroxyl groups, according to infrared spectroscopy and 29Si CP-MAS NMR and as shown by the symmetrical peaks of basic compounds from the Tanaka, Engelhardt and SRM 870 test mixtures. Stability tests for the endcapped stationary phases, measured using severe alkaline conditions (70:30 (v/v) methanol:0.05 mol/L K2CO3/KHCO3, pH 10, 50 °C), revealed that the stabilities of these phases are greater than the stabilities of similar nonendcapped phases. The stationary phases showed good performance for the separation of basic pharmaceuticals.
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Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d (99.8 atom % D), TMS 0.01 %, NMR tube size 5 mm × 8 in.
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Ethylbenzene solution, suitable for NMR (reference standard), 10% in chloroform-d (99.8 atom % D)
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Ethylbenzene solution, suitable for NMR (reference standard), 10% in chloroform-d (99.8 atom % D), NMR tube size 5 mm × 8 in. , ultra-thin wall
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Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d (99.8 atom % D), TMS 0.1 %
En este momento no podemos mostrarle ni los precios ni la disponibilidad
Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d ("100%", 99.96 atom % D)
En este momento no podemos mostrarle ni los precios ni la disponibilidad
Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d (99.8 atom % D), TMS 0.01 %, NMR tube size 5 mm × 8 in. , ultra-thin wall
En este momento no podemos mostrarle ni los precios ni la disponibilidad
Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d (99.8 atom % D), TMS 0.01 %, NMR tube size 10 mm × 8 in.
En este momento no podemos mostrarle ni los precios ni la disponibilidad
Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 1% in chloroform-d (99.8 atom % D)
En este momento no podemos mostrarle ni los precios ni la disponibilidad
Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 5% in chloroform-d (99.8 atom % D), TMS 2 %, NMR tube size 5 mm × 8 in.
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Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d (99.8 atom % D), chromium(III) acetylacetonate 0.1 mg/mL, TMS 0.01 %, NMR tube size 5 mm × 8 in.
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Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 10% in chloroform-d (99.8 atom % D), NMR tube size 10 mm × 8 in.
En este momento no podemos mostrarle ni los precios ni la disponibilidad
Sigma-Aldrich
Ethylbenzene solution, suitable for NMR (reference standard), 0.1% in chloroform-d (99.8 atom % D), TMS 0.01 %, NMR tube size 8 mm × 8 in.
En este momento no podemos mostrarle ni los precios ni la disponibilidad
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Ethylbenzene solution, suitable for NMR (reference standard), 5% in chloroform-d (99.8 atom % D), TMS 1 %, NMR tube size 5 mm × 7 in.
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