C o l u m n s w e r e p a c k e d w i t h Lichrosorb™ from EM L a b o r a t o r i e s , Elmsford, N.Y. M a j o r s , R. E., J R N L . C H R O M . S C I E N C E , Vol. 11 No. 2 (1973)
EM Reagents
Why Scientists Specify EM Products for ^ t
Liquid "| Chromatography T h e a n s w e r is s i m p l e . E M L a b o r a t o r i e s , a f f i l i a t e of E. M e r c k , D a r m s t a d t , G e r m a n y , offers t h e m o s t c o m p l e t e l i n e of p r o d u c t s for t h i n l a y e r , c o l u m n , a n d l i q u i d chromatography. These products are used world wide. Their quality and reliability are unexcelled.
I n c l u d e d i n t h e l i q u i d chromat o g r a p h y p r o g r a m are:
Large Pore EM Gels-
controlled-pore-size silica g e l of liability for t h e s o l u t i o n of s e p a r a t i o n p r o b lems b y gel permeation chromatography.
for t h e s e p a r a t i o n of p a r t i c l e s s u c h a s d i s p e r s e d p o l y m e r s , cellular components, and viruses by gel p e r m e a t i o n c h r o m a t o g r a p h y . T h e s e silica gels, u h a v i n g p o r e s i z e s u p t o 25,000 A, c a n b e u s e d with any arrangement customary for c o n v e n t i o n a l G P C .
E M Gels T y p e OR-PVA
LiChrosorb™ SI a n d LiChrosorb™ Alox T -
— a s e r i e s of v i n y l a c e t a t e copoly m e r s of c o n t r o l l e d p o r e s i z e s u i t a b l e for analyzing polar a n d non-polar polymers in organic s o l v e n t s . T h e Vs/Vo r a t i o of t h e s e g e l s is h i g h e r t h a n t h a t of a n y o t h e r semi-rigid gels available today.
s p e c i f i c a l l y for h i g h - s p e e d l i q u i d chromatography. These column packing materials are derived f r o m 60-A-pore-size s i l i c a g e l a n d a l u m i n u m o x i d e a n d a r e available in exceptionally narrow particle size distributions bet w e e n 5 a n d 40 m i c r o m e t e r s .
EM Gels Type S I - a
Perisorb™ for high speed liquid c h r o m a t o g r a p h y — T h e s e column packing materials h a v e a c h r o m a t o g r a p h i c a l l y inert glass core w i t h a c o a t i n g of ads o r p t i v e silicon d i o x i d e s e v e r a l m i c r o m e t e r s thick. P e r i s o r b is p a r t i c u l a r l y well s u i t e d for h i g h s p e e d l i q u i d c h r o m a t o g r a p h y w h e n a h i g h d e g r e e of r e s o l u t i o n is r e q u i r e d . R e l a t i v e t o " n o r m a l " s o r p t i o n m e d i a for t h i s p u r p o s e , a t e n fold i n c r e a s e
icles a r e s p h e r i c a l , achieved.
F o r a d d i t i o n a l i n f o r m a t i o n o n o u r c a p a b i l i t i e s in L i q u i d C h r o m a t o g r a p h y , c o n t a c t
EM Laboratories, Inc • a f f i l i a t e of E . M e r c k , D a r m s t a d t , 5 0 0 E x e c u t i v e Boulevard, Elmsford, N e w York 1 0 5 2 3 914/592-4660 Inquiries from o u t s i d e U.S. s h o u l d b e s e n t to E. Merck, D a r m s t a d t , Germany. CIRCLE 4 3 O N READER SERVICE CARD
Germany Telex-131512
