A capillary electrophoretic method for resolving phenolic compounds found in grape seed extracts was developed using a quaternary ammonium salt as the main electrolyte solution. Seven polyphenols were separated and identified. The separation mechanism seems to involve association between quaternary ammonium cations and the polyphenols. Migration times roughly correlate with the size of the know...

A non-saccharified high stress corn mash system was used to study the acceleration of glycolysis in glucose ethanol fermentation by Saccharoniyces cerevisiae. It was found that the controlled addition of ammonium sulfate or ammonium chloride resulted in an accelerated glycolytic rate, independent of the final ethanol yield. Adding high levels of ammonium salt, however, resulted in decreased ext...

Hydrazinolysis of unactivated amide bonds is significantly accelerated by the addition of ammonium salts. The reactions proceed at 50-70 °C to give amines with broad substrate scope that outperforms existing amide bond cleavage reactions. Application to peptide and amino sugar derivatives is also demonstrated.

Quaternary ammonium salts are frequently used as antibacterial agent that disrupts cell membrane through the binding of their ammonium cations to anionic sites in the outer layer tissue of bacteria. This article describes the synthesis of quaternary ammonium salt-type antibacterial agents with a phosphate group that strongly binds to hydroxyapatite and bromide ion as counterion. Evaluation of t...

Herein, we report the self-assembly and salt-induced thermoresponsive properties of amphiphilic random terpolymers consisting hydrophilic poly(ethylene glycol) (PEG) quaternary ammonium cations, hydrophobic dodecyl groups in water.

This paper presents a study on a series of quaternary ammonium salt (QAS) derivatives of glucopyranosides with an elongated hydrophobic hydrocarbon chain. The new N-[6-(β-D-glucopyranosyloxy)hexyl]ammonium bromides and their O-acetyl derivatives were analyzed via (1)H and (13)C NMR spectroscopy. The mutagenic activity of the newly synthesized QAS was investigated using two different techniques:...

A new substrate, ammonium thymolphthalein monophosphate, is proposed for use in alkaline and acid phosphatase determinations. The ammonium salt shares the advantages of the sodium salt, but is a more stable substrate and results in more stable working reagents. The substrate is buffered at ph 10.1 in diethanolamine for determining alkaline phosphatase activity in 5 mm, and at pH 5.9 in citrate ...

In the crystal structure of the title salt, C7H12N2 (2+)·2NO3 (-), the nitrate ions are located in the vicinity of the protonated amine groups, accepting strong N-H⋯O hydrogen bonds. Each ammonium group is involved in a total of three such inter-actions with neighbouring nitrate ions, generating a three-dimensional network. In addition, there are π-π inter-actions between the aromatic rings of ...

IN THE TITLE COMPOUND (SYSTEMATIC NAME tripropyl-azanium 2,4,6-tris-ulfanyl-idene-cyclo-hexan-1-ide), (C(3)H(7))(3)HN(+)·C(3)H(2)N(3)S(3) (-), one H atom of trithio-cyanuric acid is accepted by tripropyl-amine to form the ammonium ion. Coplanar trithio-cyanurate and tripropyl-ammonium ions [dihedral angle = 82.33 (8)°] form the salt, which is stabilised by various N-H⋯S and N-H⋯N contacts.