NEW PRODUCTS
TLC
(Thin Layer Chromatography) *
The latest laboratory re
search tool (by Camag) for the separation and purification of lipids, alkaloids, steroids, etc.
Offers: rapid separation (often less than an
hour), wide choice of developing reagents, small sample requirements, sharp separations. Mechanically—complete control of layer thickness.
Descrintive literature and bibliography available from
misco
* Ref. Analytical Chemistry, 3 3 . 1138 (August 1961).
MICROCHEMICAI SPECIALTIES CO. 1 8 2 5 EASTSHORE H I G H W A Y
BERKELEY 1 0 , CALIFORNIA
Circle No. 142 on Readers' Service Card
Butyl Ether, Spectroquality Especially puri/ied for maximum transparency... Orig inally created to use for the Ultraviolet Spectropho tometry Determination of Blood Salicylate \ and Barbiturates 2, 3.
A pyrolyzer, consisting of a control unit and separate flash heater is de signed to aid in the chromatographic analysis of many difficult-to-handle substances. The flash unit attaches to most commercial chromatographs; flash vaporized samples are swept d i rectly into the carrier gas stream. Liquid or gaseous samples are in jected directly by syringe into a sep tum on the flash heater; solid samples are encased in a quartz tube and in serted into the heater. Provision is made for plugging a variable autotransformer into the control unit to permit adjustment of vaporization temperature from a few degrees above ambient to 1 1 0 0 ° C. American In strument Co., Inc., 8 0 3 0 Georgia Ave., Silver Spring, Md. 403
Spectropolarimeter SPECIFICATIONS Ultraviolet cut-ofî 210 πιμ Infrared b a n d s of m a x i m u m t r a n s m i s s i o n 2.0-3.3, 3.8-6.6, 10.5-11.8, 12.2-13.3, 13.6-15.5.
A solvent of particular interest to the pharmacologist, toxicologist, and criminologist. Generally useful in spectroscopy. Miscible with most com mon organic solvents; immiscible with water. A solvent for hydrocarbons and fats. Write for Abstract. 1. Anal. Chem., 32 1522, 1960
2. Ibid, 33 1375, 1981
θ. Ibid, 33 1902, 1961
Matheson Coleman & Bell d i v i s i o n of T h e M a t h e s o n C o m p a n y , I n c . Noi wood (Cincinnati), Ohio; E a s t Rutherford, N e w J e r s e y
1 1 2 A
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ANALYTICAL CHEMISTRY
An instrument designed to record op tical rotary dispersion curves over the ultraviolet and visible range of the spectrum consists of a xenon arc source unit, two scanning monochromators, polarization photometer, photomultiplier detector, and a flat-bed recorder. The silica prisms of the Littrow type monochromators are controlled by a cam and lever mechanism to, give a linear wavenumber scale. The slits are controlled by a similar mechanism to maintain constant illumination of the sample at a level which can be varied in steps. The polarization unit uses two Wollaston prisms between which the specimen is located. The second prism is rotated until a null position is reached in which two of the four images formed have a minimum of in tensity. The rotation of this prism is linked mechanically to the recorder servo mechanism. Unicam Instruments Ltd., York St., Cambridge, Mass. 4 0 4
