PIERCE CHEMICAL COMPANY

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NEW CHEMICALS Radioimmunoassay kits for t h e d e t e r m i nation of plasma Cortisol, h u m a n placental l a c t o g e n , a n d cyclic A M P p e r m i t t h e m e a s u r e m e n t of as little as a billionth of a m o l e or less in biological m a t e r i a l s . All t h e reagents necessary for t h e specific procedures are i n c l u d e d ; beta or g a m m a c o u n t i n g is also r e q u i r e d . Schwarz/ M a n n . 914-359-2700 427 SikleScrene, developed by Micro-Diagnostics, is a t e s t kit which uses a rapid s i m p l e m e t h o d for on-the-site mass screening for sickle cell a n e m i a . T e s t s require 3 to 5 m i n . 100-test kit costs $17.50. Fisher Scientific Co. 412-391-1330 428 High-purity sodium dodecyl sulfate(SDS) for use in gel-electrophoresis molecularw e i g h t d e t e r m i n a t i o n s is a p o t e n t protein d é n a t u r a n t a n d solubilizing agent. With SDS, polypeptides t h a t differ by only 10% in molecular w e i g h t can be separated on t h e s a m e gel. SDS costs $5/25 g r a m s or can be o b t a i n e d as a SDS a c r y l a m i d e kit t h a t c o m b i n e s SDS w i t h a c r y l a m i d e , Bis, TEMED, a m m o n i u m persulfate, 2 - m e r c a p t o e t h a n o l , a n d coomassie brilliant blue R-250 for $55. BioRad Laboratories. 415-234-4130 429 Atomic-absorption spectroscopy standard solutions, certified w i t h concentrations of 1000 p p m ' s , are included in a p r o d u c t line of 21 metal-ion solutions. A c o m p l e t e listing is available. M C / B M a n u f a c t u r i n g C h e m i s t s . 513-631-0445 430 Stack emission reference standards are precisely characterized a n d purified s a m ples of fine particles e m i t t e d by s m o k e stacks. A kit, designated K - l , provides eight bottles of a l u m i n u m oxide, red iron oxide (2), carbon black, t i t a n i u m d i o x i d e , zinc oxide, feldspar, a n d fly a s h . Size range, m e a n d i a m e t e r , surface area, a n d size d i s t r i b u t i o n s are given for m o s t m a t e rials. $56. Duke Standards Co. 415-3282400 431

FAST QUANTITATIVE Fatty Acid Esterification These exciting new reagents offer significant advantages over other methods for the preparation of alkyl esters and other derivatives for gas phase analysis. SPEED — Most reactions are complete as s o o n as s o l u t i o n is a c h i e v e d . CONVENIENCE — One step procedure; ready-to-use reagents in Hypo-vials. CHOICE OF DERIVATIVE Methyl, Ethyl, Propyl, η-Butyl or t-Butyl; t-Butyl esters are formed as easily as methyl esters QUANTITATION - Quantitative yields are obtained — even when reagent and sample are injected without prior mixing. These significant new reagents may be ordered as listed in the next column. A

Order as follows: 4 9 3 5 0 METHYL-8 T ", DMF DIM ETHYLACETAL 2 m e q . / m l . in Pyridine S16/25ml 4 9 3 3 0 ETHYL-8™, D M F DIETHYLACETAL 2 m e q . / m l . in Pyridine S16.10ml 4 9 3 6 0 PROPYL-8"", D M F DIPROPYLACETAL 2 m e q . / m l . in Pyridine S16/10ml 4 9 3 1 0 n-BUTYL-8™, DMF-DI-n-BUTYLACETAL 2 m e q / m l . in Pyridine S16 10ml 4 9 3 2 0 t-BUTYL-8™, DMF-DI-t-BUTYLACETAL 2 meq ml in Pyridine S16 10ml

PIERCE CHEMICAL COMPANY P.O. Box 117 RocMord, Illinois 61105 U.S.A. PHONE 8 1 5 / 9 6 6 - 0 7 4 7

TWX 910-631-3J19

CIRCLE 171 O N READER SERVICE CARD

BUCHLER I N S T R U M E N T S FOR

MONITORING AND COLLECTING LIQUID EFFLUENT t These c o m p o n e n t s c o m p r i s e a highly efficient, automatic system for c o n t i n u o u s flow, liquid m o n i t o r i n g and c o l l e c t i n g . T h e y can, of course, be used separately and in c o n j u n c t i o n w i t h o t h ­ er instruments; t o g e t h e r t h e y form a C h r o m a t o ­ graphic system that y o u can d e p e n d o n . (A) Fractomette: compact. 200 tube linear traction collector (B & C) Fractoscan: double-beam UV pho­ tometer that permits use ot any wave length in the UV range; output linear in optical density. (D) Potentiometric-Servo Recorder: A re­ liable recorder with 5"wide strip chart.

Specially purified monomers for use in polyacrylamide gel electrophoresis a n d other gel f o r m i n g a g e n t s , catalysts, buffer c o m p o n e n t s , a n d stains for use in electrophoresis work are available. M C / B M a n u f a c t u r i n g C h e m i s t s . 513-631-0445 432 Arsenic test kit is sensitive to 0.03 m g / m l for a b o u t 75 cents per test. Kit includes all necessary glassware a n d c h e m i c a l s to perform up to 25 arsenic tests. Test papers are u s e d ; s a m p l e preparation m e t h o d s are d e s c r i b e d . Koslow Scientific Co. 201-861-2266 433

technical bulletin is available on request; just ask for "Alkyl-8 Bulletin."

BUCHLER INSTRUMENTS

BUCHLER INSTRUMENTS DIVISION NUCLEAR-CHICAOO CORP.

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A SUBSIDIARY OF G Ο [ S E A R L E | & CO

1327 SIXTEENTH STREET, FORT LEE, NEW JERSEY, 07024 CIRCLE 2 4 O N READER SERVICE CARD

ANALYTICAL CHEMISTRY, VOL. 4 4 , NO. 1 1 , SEPTEMBER 1972

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