Molar mass is the mass of one mole of a substance. We determine the molar masses from values on the periodic table. Answer and Explanation: Before we can sum all of the molar mass of the elements in acetic acid we need the chemical formula of acetic acid. Acetic acid's chemical formula...
A method based on extraction with acetonitrile, followed by solid-phase extraction, derivatization with acetic anhydride, and isotope dilution gas chromato... Jie Zhang and Gerard M. Cooke and Ivan H.A. Curran and Cynthia G. Goodyer and Xu-Liang Cao - 《Journal of Chromatography B》 被引量...
Unreacted amino groups on the column were end-capped by reaction with acetic anhydride. Next, mobile phase conditions were optimized for the separation of oligonucleotide mixtures up to 18-mers in length. The parameters investigated included gradients of temperature, pH, ionic strength, reversed-phase...
Stoichiometric addition of the NHS ester-activated Cyanine 3 (Cy3) dye, followed by acetylation with excess acetic anhydride gave Cy3-Ac-DTPA-Poly(l-Lys)-1 (Figure 3). The 1H NMR spectrum of Cy3-Ac-DTPA-Poly(l-Lys)-1 showed the three aromatic resonances between 6.40 and 7.86 ...
E. Study of the structure of troponin-I by measuring the relative reactivities of lysines with acetic anhydride. J. Biol. Chem. 257, 7372–7380 (1982). Article CAS PubMed Google Scholar Scholten, A., Visser, N. F. C., van den Heuvel, R. H. H. & Heck, A. J. R. Analysis ...
The method combines dispersive liquid-liquid microextraction with in situ aqueous derivatisation using acetic anhydride (Ac2O) prior to gas chromatography-mass spectrometry analysis. Several parameters affecting both extraction and derivatisation efficiency (e.g. type and volume of extractor and...
The optimised procedure consisted of the injection of a mixture containing tetrachloroethylene (extractant), acetonitrile (dispersant) and acetic anhydride (derivatising reagent) directly into an aliquot of beverage samples or into an aqueous extract of powdered milk samples obtained after a pretreatment ...
AlCl3-catalysed addition of benzene to di-endo-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (1) and subsequent treatment with acetic anhydride yields 5-exo-phenylbicyclo[2.2.1]heptane-2,3-di-endo-carboxylic anhydride (2). 3-endo-Hydrox... G Stájer,M Virág,AE Szabó,... - 《Acta...
Since no isotopically substituted GlcN-6P was available, the N -(13C2)acetyl derivative, easily obtained from (13C4)-acetic anhydride, was used as internal standard. Validation of the assay was achieved by measuring the fructose-6P Michaelis constant, in full agreement with reported values, and...
(0.25% acetic anhydride in 0.1 M triethanolamine), dehydration through graded ethanols and pre-hybridization with hybridization buffer for 2 h in a humidified chamber at 56 °C. After pre-hybridization, 1.5 × 106 c.p.m. of33P-labelled probe (50 μl per slide) was applied ...