Attention: All products sold through eChemShop are for research and development purposes only and NOT FOR HUMAN CONSUMPTION. We do not sell to individuals. We sell to research organizations only. Lead time varies usually from 2 business days up to one month. Some products REQUIRE DRY ICE SHIPPING(can cost $250 and more depending on the country and total weight). Please inquire about the lead time and shipping conditions.
COSMOSIL Cholester is a new silica based RP column which employs a cholestery
bonded phase. Cholester provides enhanced selectivity over traditional C18
materials and greater performance in separating isomers or other closely related
compounds. Cholester is ideal for method development and serves as an excellent
alternative to traditional C18 columns.
Material Characteristics:
COSMOSIL Cholester
Silicagel
high purity porous spherical silica
Average particle size
5?m
Average pore size
approx. 120?
Specific surface area
approx. 300m2/g
Stationary phase
Monomeric Cholesteryl group
End capping treatment
near-perfect treatment
Carbon content
approx. 20%
Separation of Alkylbenzene (comparison with Hydrophobicity)
Cholester provides the same hydrophobicity as ODS and C30 columns.
Cholesteryl bonded groups are very rigid structures and offer improved separation
of compounds that are difficult to analyze with alkyl group bonded materials.
Diasteromers like Stilbenes
Cholester offers improved resolution of geometric isomers.
Position isomers like Chloroacetophenones and Terphenyls
Generally isomers of disubstituted benzene are difficult to separate with C18
because their structual and polar characteristics are veryb similar.
In these cases COSMOSIL Cholester works very well.
