NEW from PHARMACIA
SEPHADEX LH-20 extends gel filtration to organic solvents P h a r m a c i a Fine C h e m i c a l s n o w introduces the first lipophilic derivative — Sephadex LH-20—to e x t e n d t h e u s e of S e p h a d e x t o o r g a n i c s o l v e n t s . S i n c e it s w e l l s in w a t e r , p o l a r o r g a n i c s o l v e n t s and in m i x t u r e s of t h e s e s o l v e n t s , S e p h a d e x L H - 2 0 m a k e s it p o s sible to apply the conventional Sephadex gel filtration technique in f i e l d s s u c h as l i p i d c h e m i s t r y , p o l y m e r c h e m i s t r y and other areas of o r g a n i c c h e m i s t r y and biochemistry where organic sol vents must be used, Sephadex Solvent-Resistant Columns T h e o n l y l a b o r a t o r y c o l u m n s es p e c i a l l y d e s i g n e d f o r u s e in c h r o matographic separations with organic solvent systems. The col umns are equipped with t w o spe cially designed adjustable f l o w adaptors f o r use w i t h v a r i o u s b e d h e i g h t s a n d f o r e a s e of s a m ple application.The c o l u m n s have t h e a d v a n t a g e of a l l o w i n g e i t h e r d e s c e n d i n g , u p w a r d f l o w or re c y c l i n g c h r o m a t o g r a p h y as o n e of t h e i r m a n y f e a t u r e s . RANGE OF APPLICATION Solvent
Approx. solvent regain ml solvent/g dry gel
Approx. bed volume ml/g dry gel 4
Dimethylformam de
2.2
Water
2.1
4
Methanol
1.9
3.5-4.0
Ethanol
1.8
3.0-3.5
Chloroform*
1.8 1.6
3.0-3.5
n-butanol Dioxane
1.4
2.5-3.0 2.5-3.0
Tetrahydrofuran
1.4
Acetone
O.B
•Containing 1% ethanol.
3
1.5 P. rticle size: 25-100μ
EXAMPLE OF SPECIFIC APPLICATION
50
100 Elution volume ml
Separation of glycerol esters in chloroform. Bed dimensions: 2.5x32 cm. Sample: 2 ml containing 4 mg of each substance. Flow rate: 0.6 ml/mtn. For additional technical information, including the booklets Sephadex LH-20 and The Sephadex Sol vent-Resistant Columns, write to: PHARMACIA FINE CHEMICALS INC. 800 Centennial Avenue Piscataway, New Jersey 08854 Pharmacia (Canada) Ltd., 110 Place Crémazie, Suite 412, Montreal 11, P. Q. (Inquiries directed Uppsala,
outside U.S.A. to PHARMACIA Sweden.)
and Canada should be FINE CHEMICALS,
See ACS Laboratory Guide for All Products/Sales Office Circle No. 140 on Readers' Service Card 70 A
·
ANALYTICAL CHEMISTRY
NEWS the Optical Society of America, and of the IEEE. He has some hundred publications in the fields of physics, communication engineering, chemistry, mathematics, and philosophy, and holds forty patents. He is the recipient of the Ï951 IRE Harrv Diamond Award, the 1961 ACS " Award in Chemical Instrumentation (sponsored by Ε. Η. Sargent & Co.), and the 1962 ISA distinguished achievement award. Joseph Jordan is Professor of Chemis try at The Pennsylvania State Univer sity, University Park, Pennsylvania. He obtained his undergraduate and graduate education at the Hebrew Uni versity, Jerusalem, Israel, where he earned his Ph.D. degree in 1945 and was subsequently appointed an instructor of inorganic and analytical chemistry. In 1950, Dr. Jordan came to the U. S. and was associated with J. J. Lingane as a Research Fellow at Harvard, and with I. M. Kolthoff as Research Fellow and Instructor at the University of Minne sota. Dr. Jordan joined the faculty of Penn State in 1954. Dr. Jordan served as visiting pro fessor at the University of California (Berkeley) in 1959, at the Swiss Federal Institute of Technology (Zurich) in 1961-62 and at Cornell in 1965. He was a research collaborator at the Brookhaven National Laboratory between 1960 and 1963. Dr. Jordan is the cur rent chairman of the Commission of Electrochemistry of the International Union of Pure and Applied Chemistry, a member of the Editorial Board of Analytical Letters and a fellow of the American Association for the Advance ment of Science. He has published about 80 research papers and has contributed chapters (on thermometric titrations, on kinetics of heterogeneous electron transfer and on amperometric titrations) to authori tative handbooks and treatises of an alytical chemistry. He was program chairman of an ACS Symposium on Thermoanalytical Titrimetry (132nd National Meeting, New York, 1957) and of the 1967 Analytical Summer Symposium on Modern Titrimetry sponsored by the Division of Analyti cal Chemistry of the American Chemi cal Society and by ANALYTICAL C H E M ISTRY.
Dr. Jordan has active research inter ests in the fields of polarography, ki netics and mechanisms of electrode re actions, electron transfer processes of biological relevance, thermochemical methods of analysis, chemistry of fused salts and gas chromatography. His contributions include the development of mercury and platinum convection electrodes and of the mercury frit elec trode for peak polarography, hydrody-
namic voltammetry, direct injection enthalpimetry, thcrmokinetic analysis, and "tailor made gases" based on kinetic gas theory. Dr. Jordan is vitally interested in teaching at the undergraduate and graduate levels. Ho has directed at Penn State about two dozen Ph.D. theses of students majoring in analyti cal chemistry: One third of these stu dents now hold faculty positions at various universities. Robert A. Osteryoung is Group Leader of Physical Chemistry at the Science Center of North American Rockwell Corporation and is also Assist ant Director of Physical Sciences at that Corporation's Autonetics Division. He was born in Cleveland in 1927. He received a B.S. degree from Ohio Uni versity in 1949. He received his M.S. in 1951 and his Ph.D. in 1954 from the University of Illinois. His thesis work, under Professor H. A. Laitinen, was concerned with electrochemical studies in fused salts. From 1951-52, Dr. Osteryoung was employed in the Synthetic Optical Crystal Laboratory at Harshaw Chemi cal Co. In 1954, he joined the faculty at Rensselaer Polytechnic Institute as an Assistant Professor and was promot ed to Associate Professor in 1958. In 1958 he was a Summer Research Asso ciate at Argonne National Laboratory. In 1959 he joined North American's Atomics International Division as a Re search Specialist, and he became Group Leader when the Science Center was es tablished in 1961. In January 1967, he also became associated with the Au tonetics Division of North American. He has been a Visiting Associate in Chemistry at the California Institute of Technology since 1963. Dr. Osleryoung's research interests have included the chemistry and elec trochemistry of fused salts, studies of adsorption of electroactive species, ki netics of electrode processes, applica tion of internal reflection spectroscopy to electrochemistry, electroanalytical applications of pulse polarography and electrochemical instrumentation. He has published about 40 papers in these areas. He is a member of the American Chemical Society, the Electrochemical Society, the International Committee of Electrochemical Kinetics and Thermo dynamics (C. I. T. C. E.) and is a past chairman of the Gordon Research Con ference on Electrochemistry. Robert L. Pecsok was born in Cleve land, Ohio, in 1918. He received an un dergraduate degree in chemistry from Harvard College in 1940 and a Ph.D. from Harvard University in 1948. Dr. Pecsok was appointed an assistant pro-
