Evaluation of amphiphilic properties of fulvic acid and humic acid by alkylpyridinium binding study was written by Yee, Min Min;Miyajima, Tohru;Takisawa, Noboru. And the article was included in Colloids and Surfaces, A: Physicochemical and Engineering Aspects in 2006.HPLC of Formula: 104-73-4 This article mentions the following:
Amphiphilic properties of Aso fulvic acid (AFA) and Aso humic acid (AHA) were evaluated through a study on the binding of N-alkylpyridinium bromide (CnPy+Br–, n = 12, 14 and 16), with a potentiometric titration method with surfactant-ion-selective membrane electrodes in aqueous solution of pH 9.18 and ionic strength of 0.03 M at 25°. Different binding behaviors were observed between AFA and AHA due to the differences in the d. of carboxylate groups as well as hydrophobicity-hydrophilicity balance. Independent sites binding behavior was observed in the CnPy+-AHA system; however, cooperative binding was observed in CnPy+-AFA system. The binding of CnPy+ to AHA was stronger than that to AFA, reflecting the importance of hydrophobic interaction between surfactant mols. and the backbone of AHA mols. The chain length dependence of the free energy of binding per CH2 group amounted to about 3.1 kJ/mol in CnPy+-AFA system, which is comparable to CnPy+ binding to dextran sulfate, and that for the CnPy+-AHA system was 2.3 kJ/mol. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4HPLC of Formula: 104-73-4).
1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of −48.7 × 10−6 cm3·mol−1.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·mol−1 in the liquid phase and 140.4 kJ·mol−1 in the gas phase. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.HPLC of Formula: 104-73-4