Topic
Buffer solution
About: Buffer solution is a research topic. Over the lifetime, 6948 publications have been published within this topic receiving 112440 citations. The topic is also known as: pH buffer & buffer.
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TL;DR: It was shown that in acetonitrile, the maximum binding capacities of the imprinted and non-imprinted polymers were 474 and 389 micromol g(-1), respectively, and it was suggested that hydrogen bonding and ionic bonding between the binding sites and the DPG played an important role in molecular recognition in aconetitrile.
50 citations
TL;DR: It is suggested that the combination of the two descriptors, logD and N(CH(2)), may be useful for quantitative structure-activity relationship analysis of the biological activities involving distribution and/or transport of chemical compounds in biological systems.
50 citations
TL;DR: In this article, the molecular weight of α-amylase from pig's pancreas has been determined from sedimentation and diffusion experiments, with a molarity of 0.2 in sodium chloride, 0.02 in boric acid and 0.005 in borate.
Abstract: Prof. Kurt H. Meyer and his co-workers1,2 have recently succeeded in the crystallization of α-amylase from pig's pancreas. The molecular weight of the substance, kindly supplied by Prof. Meyer, has been determined from sedimentation and diffusion experiments. The dried substance was dissolved in a buffer solution of pH 8.4, with a molarity of 0.2 in sodium chloride, 0.02 in boric acid and 0.005 in borate.
50 citations
TL;DR: The development, characterization and application of an Nb(2)O(5) film formed on the surface of a carbon ceramic material, SiO(2)/C, obtained by a sol-gel method, using the spin-coating technique shows high sensitivity in the simultaneous determination of hydroquinone and catechol in the presence of resorcinol.
Abstract: This paper describes the development, characterization and application of an Nb2O5 film formed on the surface of a carbon ceramic material, SiO2/C, obtained by a sol–gel method, using the spin-coating technique. The working electrode using this material will be designated as SiCNb. Hydroquinone and catechol can be oxidized at this electrode in the presence of resorcinol, allowing their simultaneous detection. The electrochemical properties of the resulting electrode were investigated using cyclic and differential pulse voltammetry techniques. Well-defined and separated oxidation peaks were observed by differential pulse voltammetry in Tris–HCl buffer solution at pH 7 containing 1 mol L−1 KCl in the supporting electrolyte solution. The SiCNb electrode exhibited high sensitivity in the simultaneous determination of hydroquinone and catechol in the presence of resorcinol, with the limits of detection for hydroquinone and catechol being 1.6 μmol L−1 and 0.8 μmol L−1, respectively. Theoretical calculations were performed to determine the ionization energies of hydroquinone, catechol and resorcinol; the results were used to explain the simultaneous determination of species by differential pulse voltammetry. The presence of resorcinol did not produce any interference in the simultaneous detection of hydroquinone and catechol on the surface of the modified electrode.
50 citations
TL;DR: In this paper, the effect of pH and turbidity on colour measurement of raw sugar solutions can be minimised by using MOPSO buffer and three glass-fibre filters in series.
Abstract: Colour, an important parameter in quality evaluation of raw sugar solutions, is sensitive to and greatly affected by pH and turbidity of the solutions. Buffers and filtration were used to control the problematic colour fluctuations due to the above factors. The buffers used to maintain pH included glutaric acid, citric acid, 3-(N-morpholino)-2-hydroxy-propane sulphonic acid (MOPSO), triethanolamine (TEA) and tris-hydroxymethy-aminomethane (Tris). The turbidity was minimised by using glass-fibre filters with a 0·7-μm pore size in series. The results showed that by using MOPSO buffer and three glass-fibre filters in series, the effect of pH and turbidity on colour measurement of raw sugar solutions can be minimised. MOPSO buffer combined excellent pH stabilisation at pH 7·00 and limited colour alteration. © 1997 SCI.
50 citations