A novel Cu(II) tetranuclear complex, chemical properties and catalysis of hydrolysis of phosphate esters

2019 ◽  
Vol 102 ◽  
pp. 45-50 ◽  
Author(s):  
Ugochukwu C. Okeke ◽  
Yilma Gultneh ◽  
Jerry P. Jasinski ◽  
Ray J. Butcher
Keyword(s):  
Chemical Properties ◽  
Phosphate Esters ◽  
Complex Chemical ◽  
Tetranuclear Complex ◽  
Hydrolysis Of

THE EFFECT OF CROPPING ON SOME CHEMICAL PROPERTIES OF A SPHAGNUM PEAT SOIL

1963 ◽  
Vol 43 (1) ◽  
pp. 171-177 ◽  
Author(s):  
L. R. Townsend ◽  
D. C. MacKay
Keyword(s):  
Hydrochloric Acid ◽  
Peat Soil ◽  
Chemical Properties ◽  
Proximate Analysis ◽  
Exchange Capacity ◽  
Sphagnum Peat ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Pre Treatment ◽  
Hydrolysis Of

Chemical analysis, including a conventional scheme of proximate analysis as well as pre-treatment with 0.1 N hydrochloric acid, were used to assess changes occurring in the chemical properties of a strongly acid sphagnum peat when it was limed, fertilized and cropped for 3- and 5-year periods. Pre-treatment was necessary to remove the large quantities of added fertilizer and limestone which were found to neutralize substantial amounts of the hydrochloric acid required for the hydrolysis of hemicellulose.In comparison with raw peat the percentages of hemicellulose and cellulose and the carbon-nitrogen ratio decreased in the cropped peat. The situation was reversed in the case of bitumen, the lignin-humic substances complex and cation-exchange capacity. The results indicated further that with cropping the composition of the peat tended towards the composition of an adjacent muck.

Kinetics of the Hydrolysis of Phosphate Esters

1977 ◽  
Vol 46 (9) ◽  
pp. 828-841 ◽  
Author(s):  
Vladimir E Bel'skii
Keyword(s):  
Phosphate Esters ◽  
Kinetics Of ◽  
Hydrolysis Of

scholarly journals Atropselective Hydrolysis of Chiral Binol-Phosphate Esters Catalyzed by the Phosphotriesterase from Sphingobium sp. TCM1

Biochemistry ◽  
2020 ◽  
Vol 59 (46) ◽  
pp. 4463-4469
Author(s):  
Dao Feng Xiang ◽  
Tamari Narindoshvili ◽  
Frank M. Raushel
Keyword(s):  
Phosphate Esters ◽  
Hydrolysis Of

scholarly journals A Comparison of Human Leukocyte Phosphatase Activity toward Sodium β-Glycerophosphate, Adenosine 5'-Phosphate and Glucose 1-Phosphate

Blood ◽  
1959 ◽  
Vol 14 (4) ◽  
pp. 415-422 ◽  
Author(s):  
JAMES H. FOLLETTE ◽  
WILLIAM N. VALENTINE ◽  
JOHN REYNOLDS
Keyword(s):  
Alkaline Phosphatase ◽  
Phosphatase Activity ◽  
Cell Population ◽  
Alkaline Phosphatase Activity ◽  
Human Leukocyte ◽  
Maximal Activity ◽  
Phosphate Esters ◽  
Chronic Myelocytic Leukemia ◽  
Myelocytic Leukemia ◽  
Hydrolysis Of

Abstract The ability of human leukocyte enzymes to hydrolyze phosphorus is compared in terms of the conventional substrate sodium β-glycerophosphate and the metabolically important phosphate esters, adenosine 5'-phosphate and glucose 1-phosphate. At pH 9.9, there is marked and comparable variation in phosphatase activity toward all three substrates, this being low in chronic myelocytic leukemia and high in the presence of infection and certain "stressful" states. Moreover, substrate mixture experiments show no increased hydrolysis of phosphorus when two substrates are present in the incubation mixture. Increased phosphatase activity toward both glucose 1-phosphate and sodium β-glycerophosphate resulted when corticosteroids were administered in large doses for 72 hours. The data, while not providing absolute proof, are compatible with the hydrolysis of phosphorus at pH 9.9, being due in the case of all three substrates to the activity of the same phosphomonoesterase or group of phosphomonesterases. At pH 5.5, phosphatase activity toward both sodium β-glycerophosphate and adenosine 5'-phosphate was likewise demonstrated, but, in leukocytes, the pH of maximal activity varies from subject to subject and is dependent to a large extent on the amount of the highly variable "alkaline phosphatase" activity present in any given cell population at the time of analysis.

scholarly journals Tryptic phosphopeptides from whole casein. II. Physicochemical properties related to the solubilization of calcium

1989 ◽  
Vol 56 (3) ◽  
pp. 335-341 ◽  
Author(s):  
Rafael Berrocal ◽  
Serge Chanton ◽  
Marcel A. Juillerat ◽  
Blaise Favillare ◽  
Jean-Claude Scherz ◽  
...  
Keyword(s):  
Binding Sites ◽  
Calcium Phosphates ◽  
Chemical Properties ◽  
Sodium Caseinate ◽  
Ph Values ◽  
Physico Chemical ◽  
Casein Phosphopeptides ◽  
Hydrolysis Of ◽  
Phosphate Solutions ◽  
Tryptic Hydrolysis

SummaryCasein phosphopeptides (GPP) were produced by tryptic hydrolysis of sodium caseinate and further purified by precipitation and chromatography on QAE-Sephadex A-25. Their physico-chemical properties were compared with the properties of an enzymically dephosphorylated equivalent preparation (DPP). Binding of Ca2+ to the peptides was measured using a Ca selective electrode and was found to increase with pH and to show 1/1 stoicheiometry Ca/Porg in CPP at pH 6·5 a.nd 7·6. Klotz plots indicated equivalent binding sites at these two pH values, but some heterogeneity was seen at pH 3·5. In contrast, DPP did not bind significant amounts of Ca2+.CPP effectively inhibited the formation of insoluble calcium phosphates at different Ca/P ratios. The effective CPP concentration was 10 mg/1 and complete stability of calcium phosphate solutions was obtained at about 100 mg/1. This stabilizing effect was dependent on the presence of organic P.

Hydrothermal Synthesis of TiO2/SiO2 Hybrid Photocatalyst from Rice Husk Ash

2007 ◽  
Vol 352 ◽  
pp. 281-285 ◽  
Author(s):  
P. Sujaridworakun ◽  
Supatra Jinawath ◽  
W. Panpa ◽  
Akira Nakajima ◽  
Masahiro Yoshimura
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Uv Light ◽  
Porous Silica ◽  
Chemical Properties ◽  
Nano Crystalline ◽  
Ultraviolet Ray ◽  
Physical And Chemical ◽  
Hydrolysis Of ◽  
Fine Tio2

Photocatalyst materials were prepared as a hybrid between TiO2 /SiO2 via low temperature hydrothermal method (150oC) without further heat treatment. Porous silica from rice husk ash was used as a support for fine TiO2 particles which acted as a photocatalyst when radiated with a UV light. TiO2-deposited SiO2 was successfully prepared through hydrolysis of TiOSO4 solution by controlling synthesis parameters such as pH ,concentration of TiOSO4, temperature and time under hydrothermal treatment. The obtained products were characterized for physical and chemical properties by means of XRD, XRF, BET and TEM . It was found that pH had an influence on the crystallization of TiO2, and under an appropriated pH, only anatase presented along with amorphous phase. High crystallinity of nano-crystalline anatase ( about 5 nm) deposited on silica surface was observed through TEM. Adsorption and photocatalytic performances of the prepared catalyst were evaluated in methylene blue aqueous solution in the dark and under ultraviolet ray irradiation, respectively. Due to the synergetic functions of adsorption by porous substrate and decomposition by TiO2 photocatalyst, an enhancing of photocatalytic activity for decomposition of organic pollutants in water under UV rays was obtained.

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