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21195-U
Fase stazionaria per GC
phase Polyethyleneimine, bottle of 50 g
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About This Item
Codice UNSPSC:
23151817
NACRES:
SB.54
Prodotti consigliati
Confezionamento
bottle of 50 g
Parametri
0-175 °C temp. range
tecniche
gas chromatography (GC): suitable
Gruppo funzionale matrice
Polyethyleneimine phase
Solubilità
acetone: soluble
Tipo di colonna
packed GC
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Descrizione generale
GC methods are divided into two classes depending on the nature of stationary phases; gas-solid chromatography (GSC) and gas-liquid chromatography (GLC). GSC has solid adsorptive material and solute particles are removed from mobile phase by electrostatic forces. GLC has a thin layer of liquid coated or bonded on the surface of an inert particle or on the walls of the column where solute particles are retained in the liquid phase based on their partition coefficients.[1] The primary necessity of a stationary phase is to provide sample separation sustaining phase integrity over a reasonable period of time. It should be stable for the chemical and thermal changes. Selectivity, peak symmetry, analysis time, degree of separation, peak tailing are few parameters to consider for choosing a stationary phase.[2] Polyethyleneimine (PEI) is suitable for protein separation. It binds insistently to negative charged stationary phase.[3] It is a pseudostationary phase which is also a cationic polymer.[4]
Sintetizzata appositamente per risultare più pura, con range di peso molecolare ristretto e senza impurità o catalizzatori in tracce per l′impiego come fase stazionaria per la GC.
Avvertenze
Warning
Indicazioni di pericolo
Consigli di prudenza
Classi di pericolo
Acute Tox. 4 Oral - Aquatic Chronic 2 - Eye Irrit. 2 - Skin Sens. 1
Codice della classe di stoccaggio
10 - Combustible liquids
Classe di pericolosità dell'acqua (WGK)
WGK 2
Punto d’infiammabilità (°F)
Not applicable
Punto d’infiammabilità (°C)
Not applicable
Dispositivi di protezione individuale
dust mask type N95 (US), Eyeshields, Gloves
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I clienti hanno visto anche
Barry L. Karger
High Resolution Separation and Analysis of Biological Macromolecules: Fundamentals (1996)
B Maichel et al.
Journal of chromatography. A, 853(1-2), 121-129 (1999-09-16)
The effect of methanol and acetonitrile, respectively, on the separation of neutral compounds (benzyl alcohol, phenols) is investigated in electrokinetic chromatographic (EKC) systems consisting of polyethyleneimine (PEI) as charged, polymeric, replaceable pseudostationary phase. The separation systems consist of a buffer
David B. Troy, Paul Beringer
Remington: The Science and Practice of Pharmacy, 605-605 (2006)
James P. Lodge, Jr.
Methods of Air Sampling and Analysis, 98-98 (1988)
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What is the Department of Transportation shipping information for this product?
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What is the molecular weight of Polyethyleneimine, Product 21195-U?
1 answer-
The molecular weight distribution of the polyethyleneimine: average Mn ~60,000 by gel permeation chromatography (GPC), average Mw ~750,000 by light scattering (ELSD; evaporative light scattering detection).
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Do you know the pKa of polyethyleneimine?
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The nitrogens in polyethyleneimine (PEI) are mainly in tertiary amines. PEI has a pKa of approximately 5.9.
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What are the specifications for Product 21195-U, Polyethyleneimine?
1 answer-
The polyethyleneimine, Supelco 21195-U, is made from Aldrich 181978. Supelco purifies the PEI to use as a GC phase; it is commonly solvated with acetone for use in the manufacturing of packings for gas chromatography columns. It exists as a thick, clear, colorless, odorless liquid at room temperature.
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