STUDY OF THE SURFACE ACIDITY OF ZEOLITE BY TEMPERATURE PROGRAMMED DESORPTION (TPD) Ⅱ.TPD SPECTRA OF n-BUTYLAMINE ADSORBED ON NaY TYPE ZEOLITES WITH DIFFERENT EXCHANGE-PERCENTAGE OF Na~+ WITH Ca~(2+) AND NH_4~+
Under the existence of sulfocyanate in the acidic property mediu,by the reduction to the yellow complex,the wave-length is the most intelligent in 404nm and the content of the tungsten at 0~1.50% scopes which conforms to the Beer′s law has a good selectivity.
The acidity and catalytic activity of Y type zeolites are not mainly determined by cation ions, Al(OH)3-xx+, it appears that the principal source of acidic property of thermal decomposed NH4Y type zeolite is the skeleton proton.
The acidic properties of the 2-position H of 1-n-butyl-3-methylimidazolium chloride ([bmim]Cl) were measured by titration, FT-IR, and 1H NMR analysis. The 2-H signal at a chemical shift of 9.5 disappeared completely and KCl was produced after titration with KOH solution, implying the significant Brnsted acidic property of the 2-H.
On the basis of total acid hydrolysis, methylation analysis, periodate oxidation and NMR studies (1H and 13C) the structure of the repeating unit of the polysaccharide was assigned and indicated only α-(1→4) linked Glucan.
PHENYLPYRUVIC ACID DERIVATIVES AS ENZYME INHIBITORS: THERAPEUTIC POTENTIAL ON MACROPHAGE MIGRATION INHIBITORY FACTOR
Phenylpyruvic acid derivatives are obtained by hydrolyzing aromatic Z/E azlactones.
A FACILE SYNTHESIS OF 2-BENZYLOXY/2-(4-ISOPROPYLBENZYLOXY)-2-METHYL-3-(4-SUBSTITUTED PHENYL)PROPANOIC ACID BASED INSULIN SNESITI
ANTIPYRETIC, ANTINOCICEPTIVE AND ANTI-INFLAMMATORY ACTIVITIES OF CERTAIN γ-OXOBUTANOIC ACID DERIVATIVES
The anticholinergic activity was incorporated into the intact esters to overcome the gastric toxicity of indomethacin, not only by blocking the acidic functionality but also by decreasing gastric secretions and motility.
In a weak acidic medium, the reaction of some aminoglycoside antibiotics (AGs) such as kanamycin sulfate (KANA), gentamycin sulfate (GEN), and tobramycin sulfate (TOB) with acid thiazolyl bisazo dye Titan Yellow (TY) can result in the fading of TY.
The results indicate that the solubility of cinnabar could be increased significantly in the presence of Na2S/S0, and strong acidic pH, respectively.
An acidic condition was preferred for the degradation of RhB.
Both results showed that the acidic agent NH4Cl did hinder EMDI-UF curing and it also affected the adhesive application method.