The concentration of H+ ions inethanolic solutions was determined by means of titration with a 0.5 mmol/L sodium hydroxide solution. AMetrohm Titrando instrument with Solvotrode and TiamoTM software was used for automatic determination of the titration curve and endpoint calculation. The pH was ...
This study describes a fast spectrophotometic titration method for apparent ionization constant (pKa) determination. In this method, a Universal pH indicator is utilized instead of the conventional pH electrode. An autoburette is set to add HCl at a constant rate to a vigorously stirred 1 cm ...
A-1 Uncertainty budget for the primary method of measurement using Cell IExperimental details have been published [42–45].A-1.1 Measurement equationsThe primary method for the determination of pH(PS) values consists of the following steps (Section4.1):1. Determination of the standard potential ...
of a solution. Visual and photometric methods rely on color changes of specific organic pigments in order to determine pH. Visual methods are completed with visual indicators such as pH test strips, while photometric determination involves shining a light through the sample and measuring the ...
(Supplementary Fig.4)) using cryo-EM, which is one of the highest resolutions hitherto achieved for a protein fibril in cryo-EM and allowed an unambiguous structure determination (Fig.2, Supplementary Fig.4). The structure consists of two coiling protofilaments, which form a right-handed ...
Comparisonofdeterminationefectivenessofacetohydroxamicacid byfixedpHtitrationmethodandHPLC LIUQiang,CUIJian—lan, Yan—bin (SchoolofChemicalEngineeringandEnvironment,NoahUniversityofChina,Taiyuan030051,China) Abstract:Thecontentofacetohydroxamicacid(AHA),apharmaceuticalintermediatewithveryweakacidity,is ...
Various methods for determination of the degree of N-acetylation of chitin and chitosan: a review. The use of IR and NMR spectroscopy methods provides a number of advantages. They do not need long-term procedures to prepare samples, and they provide ... Kasaai,R Mohammad - 《Journal of ...
The following topics are discussed: (a) pH determination using glass and reference electrodes; (b) factors that influence measured pH; (c) pH measurement in water and 0.01 M CaCl2; (d) lime requirement determination by buffer methods; (e) indirect lime requirement determination methods; (f) ...
Determining Water Content in Antibiotics through Direct Addition Using Volumetric KF Titration Learn how to improve solubility in Karl Fischer titration with a direct addition technique for more accurate water content determination in antibiotic... ...
Methods Materials. The materials including Fmoc-L-amino acid building blocks, preloaded amino acids on 2-chlorotrityl resin as solid support, and 2-(1H−benzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluoro- phosphate (HBTU) used for coupling reagents were purchased from Chem-Impex...