An electrochemical sensor for the determination of Luteolin using an alizarin red/carboxylic acid group functionalized carbon nanotube

2021 ◽  
pp. 106864
Author(s):  
Xiaojing Si ◽  
Luchen Deng ◽  
Yingzi Wang ◽  
Mei Han ◽  
Yaping Ding
Keyword(s):  
Carbon Nanotube ◽  
Carboxylic Acid ◽  
Electrochemical Sensor ◽  
Acid Group ◽  
Carboxylic Acid Group ◽  
Alizarin Red ◽  
Functionalized Carbon Nanotube

The acidity constant of fluorene-9-carboxylic acid in aqueous solution. Determination of the pKa of a sparingly soluble substance

1993 ◽  
Vol 71 (2) ◽  
pp. 227-229 ◽  
Author(s):  
A. J. Kresge ◽  
I. G. Pojarlieff ◽  
E. M. Rubinstein
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acid ◽  
Ionization Constant ◽  
Acid Group ◽  
Acidity Constant ◽  
Carboxylic Acid Group ◽  
Soluble Substance ◽  
Acid Ionization Constant ◽  
Acid Ionization

The acid ionization constant of the carboxylic acid group of fluorene-9-carboxylic acid in aqueous solution at 25 °C was determined to be pKa = 3.61, using a method based upon the increase in solubility of this sparingly soluble substance brought about by its ionization. This corrects an earlier considerably different value of this quantity determined by equating pKa with the pH measured at half-neutralization. The hazard inherent in the latter method when applied to sparingly soluble substances is discussed.

The inner salt 4-carboxy-2-(pyridinium-4-yl)-1H-imidazole-5-carboxylate monohydrate

2006 ◽  
Vol 62 (7) ◽  
pp. o2751-o2752 ◽  
Author(s):  
Ting Sun ◽  
Jian-Ping Ma ◽  
Ru-Qi Huang ◽  
Yu-Bin Dong
Keyword(s):  
Carboxylic Acid ◽  
Dihedral Angle ◽  
Title Compound ◽  
Acid Group ◽  
Planar Structure ◽  
Carboxyl Group ◽  
Carboxylic Acid Group ◽  
Pyridyl Group ◽  
Compound C

In the title compound, C10H7N3O4·H2O, one carboxyl group is deprotonated and the pyridyl group is protonated. The inner salt molecule has a planar structure, apart from the carboxylic acid group, which is tilted from the imidazole plane by a small dihedral angle of 7.3 (3)°.

scholarly journals Crystal structure of betulinic acid methanol monosolvate

2014 ◽  
Vol 70 (12) ◽  
pp. o1242-o1243 ◽  
Author(s):  
Wei Tang ◽  
Neng-Hua Chen ◽  
Guo-Qiang Li ◽  
Guo-Cai Wang ◽  
Yao-Lan Li
Keyword(s):  
Carboxylic Acid ◽  
Solvent Molecule ◽  
Acid Group ◽  
Carboxylic Acid Group ◽  
Syzygium Jambos ◽  
Carboxylic Acid Groups ◽  
Pentacyclic Triterpenoid ◽  
Naturally Occurring ◽  
Dimensional Network ◽  
Chinese Medicinal Plant

The title compound [systematic name: 3β-hydroxylup-20(29)-en-28-oic acid methanol monosolvate], C30H48O3·CH3OH, is a solvent pseudopolymorph of a naturally occurring plant-derived lupane-type pentacyclic triterpenoid, which was isolated from the traditional Chinese medicinal plantSyzygium jambos(L.) Alston. The dihedral angle between the planes of the carboxylic acid group and the olefinic group is 12.17 (18)°. TheA/B,B/C,C/DandD/Ering junctions are alltrans-fused. In the crystal, O—H...O hydrogen bonds involving the hydroxy and carboxylic acid groups and the methanol solvent molecule give rise to a two-dimensional network structure lying parallel to (001).

scholarly journals Studies on Adhesion Properties of Grafted EPDM Containing Carboxylic Acid Group

2012 ◽  
Vol 13 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Dongho Kim ◽  
Yoomi Yoon ◽  
Ildoo Chung ◽  
Chanyoung Park ◽  
Jongwoo Bae ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Acid Group ◽  
Carboxylic Acid Group ◽  
Adhesion Properties ◽  
Grafted Epdm
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