TRANSMISSION DENSITOMETER of High Sensitivity THE
and Stability
for
QUANTITATIVE PAPER CHROMATOGRAPHY
ANALYST'S COLUMN L.T. HALLET, Science Editor
"ΤΉΕ American Oil C h e m i s t s ' Society -*- is holding a general meeting in M i n n e apolis October 11, 12, a n d 13. One of t h e symposia a n n o u n c e d deals with analysis as follows : Chromatography in Fatty Acid Analysis. R. T. HOLMAN, Hormel Institute, Austin, Minn. Application of Infrared Spectrophotom etry to Analysis of Fatty Acid Deriva tives. R. T. O'CONNOR, Southern Re gional Research Laboratory, New Orleans, La.
No. 3835B
Chemical Determination of Unsaturation in Fatty Acid Derivatives. D . S. BOLLEY, Baker Castor Oil Co., Bayonne, N. J. Application of Ultraviolet Spectro photometry to Analysis of Fatty Acid Derivatives.
S.
F. HERB
AND R.
PATENT N O . Ϊ424Θ33
The special Welch Transmission light source with a filter paper guide for holding and advancing the papergram at 3 mm increments, when used with the Densichron becomes a complete transmission densitometer for quantitative paper chromatography. The quantitative analysis of complex compounds such as PROTEINS, SUGARS, V I T A M I N S , etc., has been simplified by reading maximum densities of papergrams with the DENSICHRON. This new apparatus and procedure will speed up your work and permit the analysis of very small samples. Works equally well for quantitative paper electrophoresis. This Instrument was demonstrated last December at the Chemical Industries Exposition in Philadelphia. Write for literature describing the production of papergrams and the use of the Densichron for quanti tative determination by the maximum density method. 4l40
W. M. WELCH SCIENTIFIC COMPANY DIVISION OF W. M. WELCH MANUFACTURING COMPANY ESTABLISHED 1880
1515 Sedgwick St.. Dept. A - l . Chicago 10, Illinois. U.S.AJ For further information, circle number 19 A-1 on Readers' Service Card, page 45 A
W.
RIEMENSCHNEIDER, Eastern Regional Re search Laboratories, Philadelphia, Pa. For those interested in t h e general field of fats a n d oils, t h e background a n d work of t h e H o r m e l I n s t i t u t e will be of interest. T h i s institute was established as a u n i t of t h e G r a d u a t e School of t h e University of M i n n e s o t a on N o v e m b e r 30, 1942, b y a n agreement between t h e Hormel F o u n d a t i o n , founded by t h e late J a y C. Hormel, whose d e a t h occurred Aug. 30, a n d t h e Board of R e g e n t s of t h e university. T h e purpose of t h e in s t i t u t e , in accordance with t h e agree m e n t , is t o p r o m o t e education a n d re search in p l a n t , animal, a n d p o u l t r y production a n d utilization. T h e a c tivities include studies in such fields as t h e relation of animal p r o d u c t s to dis ease a n d t o t h e t r e a t m e n t of disease, animal a n d p o u l t r y diseases, a n d food technology a n d nutrition. Also in cluded a r e tree culture a n d wood tech nology a n d other subjects as m a y be m u t u a l l y agreed upon. T h e personnel a n d facilities of t h e in s t i t u t e enable it t o render services in research for i n d u s t r y a n d for various governmental agencies. Specific re searches which outside agencies are n o t prepared t o conduct themselves will b e conducted in fields where t h e i n s t i t u t e can function m o s t effectively b y virtue of t h e experience a n d t a l e n t s of its perVOLUME
2 6 , N O . 9, S E P T E M B E R
Mettler ANALYTICAL BALANCES offer the scientist the finest precision weighing instrument that has yet been devised. Since precision weighing to the finest tolerance is essential in your operation, you cannot afford to be
without the NEW METTLER BAL ANCE. WRITE FOR INFORMATION OR SERVICE.
METTLER INSTRUMENT CORP. HIGHTSTOWN N.J. For further information, circle number 19 A-2 on Readers' Service Card, page 45 A
1954
19 A
ANALYST'S COLUMN sonnel. The agreement between the regents and the Hormel Foundation provides that the regents may accept gifts, grants, and donations from other sources when such funds are in support of the purposes of the institute, and when by their acceptance the institute can render valuable service. The Hormel Foundation sells, on a nonprofit basis, various pure fatty acids and esters not available from other sources. The manufacture of these chemicals is supervised by the Hormel Institute as a public service. It is this service that has done much to earn for the institute the world-wide apprecia tion of workers in the field of fats and oils. THE Division of Analytical Chemistry has been making a special effort to double its present size of 1000 members. The Membership Committee under the chairmanship of K. G. Stone of Michi gan State College is doing a splendid job, and we wish it success in attaining the goal. The one dollar fee is modest, and even that is returned if one considers that separates of abstracts of national meeting papers are received by members and a substantial discount is given to those who purchase the complete ab stract book. The main reason for join ing, in our opinion, is that it identifies us with activities and permits a voice in the affairs of the division which contrib utes to the advance of analytical chem istry. The more members, the greater will be their influence on the growth and prestige of their profession. The first directory of division mem bers has been enthusiastically received, and a new edition is being sponsored by the Arthur H. Thomas Co., Phila delphia. This is another reason for the present drive, so that everyone who wishes to join will be officially listed. R. P. Chapman, American Cyanamid Co., Stamford, Conn., will welcome and acknowledge your membership. THAT hardy perennial, the Pittsburgh Conference on Analytical Chemistry and and Applied Spectroscopy, is reported to be preparing a bigger and better one for February 28 through March 4. We are glad we are not on the committee to ob tain more space for the instrument ex hibit, but, by past performance, they will do it somehow. Program Chair man, J. F. Miller, Mellon Institute, must have triplicate copies of abstracts of papers, and they are required before NOvember 19. V O L U M E 26, NO. 9, S E P T E M B E R
A Great Forward Stride in Laboratory Evaporation ROTOVAP Automatic Distilling Apparatus
OMPLETELY AUTOMATIC, ROTOVAP is engineered for the safe, rapid and efficient evaporation of solutions— either dilute or concentrated by batch or continuous operation. Because Rotovap incorporates a unique aluminum spindle which rapidly rotates the evaporating flask, frothing and "bumping" of even concentrated solutions is eliminated.
C
The speed at which Rotovap distills is uncanny. For ex ample, it will evaporate automatically 100 ml of aqueous solu tion at 55° C in 10 to 15 minutes under the reduced pressure of an ordinary water aspirator. For low boiling solvents—such as butanol—Rotovap's speed is correspondingly high. For detailed information, write for folder RV. E 3 2 - 9 2 2 Rotovap complete without d r o p p i n g funnel, 1 1 0 V o l t s A . C. $ 1 8 5 . 0 0 E 3 2 - 9 2 2 A Glass evaporating flask, 2 5 0 ml
1.80
E 3 2 - 9 2 2 B Glass connecting spindle, male to socket
4.75
E 3 2 - 9 2 2 C Glass connecting e l b o w with continuous feed tube
6.50
E 3 2 - 9 2 2 D Glass condensing flask with drainage tube and stopcock
8.25
E32-922E Plastic belt
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E32-922F Perforated M e t a l C o o l i n g Spray A l l prices F.O.B. N e w Y o r k , Ν .
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E A S T 23rd
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For further information, circle number 21 A on Readers' Service Card, page 45 A
1954
21 A
