For accurate results

in organic and biochemical research,

select the reagents with actual

analytical values on the label

lib. 1-8993

Oisodium EDTA. Dihydrate Crystal _

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'""'"•'· «. , , ' . , S ' * H 0 ! 0,0005 *

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C;ÎF·· «:S * * ^ Γ Γ ; : , , · ' - = O.O5 '"«""· (c„ 0.2 ' ••«<>ι» • • · . 0 . 0 5 — « . > - - » l M „ •• 0 .8 Γ',·"*.ι X 0.02

J. T. BAKER CHEMICAL CO., PHILLIPSBURG, N. J. 08865

You receive proof of purity with

the actual lot analysis for the

product in the container

You receive useful information for repetitive work, for assessment of

blank values, and for reference in evaluating test results

You receive actual values for key impurities, which saves you time and money by eliminating the need to determine these values yourself

You receive valuable reference point data, for today's advanced analytical techniques

600 A · ANALYTICAL CHEMISTRY, VOL. 46, NO. 7, JUNE 1974

Here's actual proof-of-performance In these verbatim statements, professionals tell why they specify 'Baker Analyzed'* Reagents for today's increasing demands in organic and biochemical research:

Grignard Reactions "The starting point for chemical synthesis is clearly defined. Insta-Start® Ether and Insta-Start® THF are wonderful solvents for safely obtaining high yield and purity in the formation of Grignard reagents. Grignard reagents prepared in low yield by normal procedures are formed in high yield and purity using J.T. Baker's Insta-Start® Ethers in a cyclic reactor as described by Rowland, Greenlee and Boord (Abstracts in Papers, 117th Meeting of ACS, Philadelphia, Pennsylvania, April, 1950; p8-L)." Pharmaceutical Quality Control "In this day and age when the controls on the pharmaceutical industry is ever becoming more thorough I have no worries, but complete confidence in the 'Baker Analyzed' Reagents I use in assay development. It makes no difference if I'm working with gas chromatography, a spectrometric assay (UV, Visible or Infrared) orfluorometric assay and have never had any interference from a 'Baker Analyzed' Reagent." Enzymes Studies "Reaction pathways for many enzymes are drastically altered by specific ions, e.g. metals such as Mg + +, Zn + + . Recently, threshold values for some of these crucially important effects have become available. It would be irresponsible, in such experiments, to use reagents containing unknown levels of metal ions, since error might be introduced. Therefore, the availability of critical control and published levels of impurities in 'Baker Analyzed' Reagents is not only reassuring and desirable, but absolutely essential to the conduct of the highest quality work. Why not do it right the first time?" Hematopoietic Research "To carry out a series of studies on the quantitative effects of lead and mercury on the hematopoietic system we had to use 'Baker Analyzed' Reagents. All substances added to our blood suspensions had to have known quantities of either lead or mercury so we checked each solution with our Atomic Absorption Spectrometer. We found the 'Baker Analyzed' Reagents

well within the stated levels for lead and mercury. Thus we were able to use the Baker reagents with confidence which led to considerable success in our investigations." Antigen-Antibody Complexes "When I expose tissue or antigen-antibody complexes to solutions compounded from a variety of chemicals, I simply MUST have confidence that the biological changes noted are NOT the result of impurities in water or chemicals. It has been by experience that, as long as I have reagent label lot numbers and quality control analyses, I have no difficulty in the interpretation of my experimental data." Enzyme and Membrane Systems "Some enzymes and membrane systems are so sensitive to particular ions that anomalous results are common and often can be traced to a certain batch of reagent. In such cases, I have found the numerical analysis on each 'Baker Analyzed' Reagent especially helpful in identifying previously unknown effects of critical ions present in very low concentrations." Enzymatic Reactions Studies "In enzymatic reactions studies, such reactions are affected by minute traces of ions such as Ca, Mg, Mn, or P04 which serve to activate the enzyme and also heavy metals such as Ag, Fe and Pb or anions like F which serve to deactivate the enzyme. The analysis on every 'Baker Analyzed' label clearly defines impurity levels with actual values which warns me of the potential effect resulting from the presence of contaminants—whether they are beneficial or otherwise." Trace Analysis

"Critical analysis of biological fluids, performed by modern method (values in picograms/milliliter or less), allows no room for contaminating substances. This is particularly true in the fields of atomic absorption spectrophotometry and radioimmuno assays. With Baker's chemicals I always know what I'm working with."

No other manufacturer labels laboratory products like Baker does. Compare the points of test and the actual lot analysis on the label at left, with the label on any other brand of reagent grade Disodium EDTA in your lab, and you'll see what we mean. You can put your confidence in 'Baker Analyzed' Reagents, when you need top performance in your critical work. You can also expect fast deliveries, when you

specify Baker reagents because we take as much care with service as we do with quality. There's $15,000,000 worth of Baker lab chemicals in stock, and over 100 convenient distributor locations to get supplies to you fast and efficiently . . . one is sure to be close to your lab. For more information, or to order'Baker Analyzed'Reagents, contact your local J.T. Baker distributor or write: J.T. Baker Chemical Co., 222 Red School Lane, Phillipsburg, N.J. 08865.

lnor3anicand biochemical research the professional chooses J.T Baker

J.T.Baker

CIRCLE 29 ON READER SERVICE CARD

ANALYTICAL CHEMISTRY, VOL. 46, NO. 7, JUNE 1974 · 601 A

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