For optical purity analysis and separation of optical Isomers
The Second Wave of Pirkle Columns from Regis The first wave Based on a n approach developed by Dr. William H. Pirkle of t h e University of Illinois, a first w a v e of chiral c o l u m n s w a s i n t r o d u c e d b y R e g i s in 1982. T h e s e c o l u m n s w e r e packed w i t h silica-bonded d i n i t r o b e n z o y l (DNB) d e r i v a t i v e s of p h e n y l g l y c i n e a n d , later, leucine. Tbday t h e s e c o l u m n s a r e finding w i d e u s e in s e p a r a t i n g o p t i c a l i s o m e r s from m a n y c l a s s e s of aromatic c o m p o u n d s such as alcohols, sulfoxides, bi-B-naphthols, B-hydroxysulfides, a n d a g e n t s related t o propranolol.
The second wave Now Regis introduces a second wave: The new Pirkle covalent naphthylalanine HPLC columns. These columns are especially designed for separating the DNB derivatives of amines, amino acids, alcohols, and thiols. These new columns are startlingly selective, with relative retentions as high as 16.5 already reported. These second wave columns are also characterized by typical Regis advantages: They are covalent, highly efficient, based on spherical silica, and strongly guaranted. The guarantee: If, for any reason, you are not satisfied with the performance of your Regis column, simply return it for a full refund.
How supplied The first wave, still available and widely used Ionic 25 cm columns D-Phenyl Glycine L-Leucme Covalent 25 cm columns D-Phenyl Glycine L-Phenyl Glycine D.L.-Phenyl Glycine L-Leucine The beginning of the second wave Covalent 25 cm columns D-Naphthyl Alanine L-Naphthyl Alanine D.L. Naphthyl Alanine Regis Pirkle column literature available upon request from your Regis distributor, or write:
Regis Chemical Co. 8210 Austin Avenue Morton Grove, Illinois 60053 USA CIRCLE 183 ON READER SERVICE CARD
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Zetapor® membrane represents a major advance in the filtration of liquid organic HPLC samples. Its superior particulate retention is due to submicron sieving and enhanced filtration characteristics. Made of hydrophilic Nylon 66, Zetapor is compatible with most solvents and aqueous solutions. Available in 3 mm, 13 mm and 25 mm disposable filters and standard cut discs. 0.2μπι and 0.45 μπη pore sizes. Call or write: CUNO Laboratory Products, 4 0 0 Research Parkway, Meriden, CT 0 6 4 5 0 , U.S.A. Telex: 221083 Telefax: 203-238-8716. Call toll free: 1 -800-231 -2259. In Connecticut: 203-238-8974. SUBSIDIARY OF COMMERCIAL SHEARING. INC.
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NewRCDGC Detector Uniquely Selective.
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Now you can d e t e c t formaldehyde, reactions. It's c o m p a t i b l e w i t h y o u r p a c k e d or capillary GC. Or, order it formic acid, ammonia, hydrogen as a n integrated system with a sulfide, carbon disulfide, hydrogen, Model 5880 or Model 5890 Hewlettcarbon m o n o x i d e . . . alcohols, p h e Packard GC. nols, aldehydes, acids, amines, For more information, call or write: sulfides, olefins, aromatic Sievers Research, Inc., 2905 Center hydrocarbons.... Green Court, Suite B, Boulder, All without interference from Colorado 80301. (303) 444-2009. alkanes, water, chloroalkanes a n d other unreactive compounds. T h e n e w Model 207 Redox Chemi l u m i n e s c e n c e D e t e c t o r (RCD™) responds to compounds that 2905 Center Green Court, Suite Β r e d u c e nitrogen dioxide in Boulder, Colorado 80301 303-444-2009 catalyzed oxidation/reduction See us at Pitcon Booth No. 13015. CIRCLE 197 ON READER SERVICE CARD
236 A · ANALYTICAL CHEMISTRY, VOL. 59, NO. 3, FEBRUARY 1, 1987
