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A certificate of analysis (COA) is a formal laboratory-prepared document that details the results of (and sometimes the specifications and analytical methods for) one or more laboratory analyses, signed—manually or electronically—by an authorized representative of the entity conducting the analyses. This document gives assurances to the ...
VWR acquired two other companies earlier in the year, EPL Archives and Seastar Chemicals [17] On May 5, 2017, it was announced that Avantor , a Center Valley, Pennsylvania-based supplier of ultra-high-purity materials to the life sciences and advanced technology industries, would acquire VWR for $33.25 in cash per share of VWR common stock ...
N-(1-Naphthyl)ethylenediamine dihydrochloride is widely used in the quantitative analysis of nitrate and nitrite in water samples by colorimetry.It readily undergoes a diazonium coupling reaction in the presence of nitrite to give a strongly colored azo compound.
Secondary chemical reference substance: substance whose characteristics are assigned and/or calibrated by comparison with a primary chemical reference substance. The United States National Institute of Standards and Technology (NIST) uses the trade marked term [ 12 ] Standard Reference Material (SRM) to denote a certified reference material ...
Sigma Chemical Company of St. Louis and Aldrich Chemical Company of Milwaukee were both American specialty chemical companies when they merged in August 1975. The company grew throughout the 1980s and 1990s, with significant expansion in facilities, acquisitions and diversification into new market sectors.
Eppendorf, a company with its registered office in Germany, develops, produces and sells products and services for laboratories around the world.. Eppendorf products are used in academic and industrial research laboratories, e.g. in companies in the pharmaceutical, biotech, chemical and food industries.
Under basic conditions, MBA reacts further with formaldehyde at the amide nitrogen to give N-hydroxymethyl,N,N′-methylenebisacrylamide.Nucleophiles such as alcohols, amines, or thiols add across the activated vinyl groups, giving mixtures of mono- and disubstituted products.
Coenzyme B 12 (adenosyl-cobalamin) is an organometallic form of Vitamin B 12 and serves as the cofactor of Methylmalonyl-CoA mutase, which is an essential enzyme in the human body. [4] The transformation of Methylmalonyl-CoA to Succinyl-CoA by this enzyme is a radical reaction .