Photochemical behavior of organic phosphate esters in aqueous solutions irradiated with a mercury lamp

1992 ◽  
Vol 49 (3) ◽  
pp. 368-374 ◽  
Author(s):  
Seiichi Ishikawa ◽  
Yutaka Uchimura ◽  
Kenzo Baba ◽  
Yoshio Eguchi ◽  
Kozo Kido
Keyword(s):  
Aqueous Solutions ◽  
Organic Phosphate ◽  
Phosphate Esters ◽  
Mercury Lamp ◽  
Photochemical Behavior

Photochemical Behavior of Folic Acid in Alkaline Aqueous Solutions and Evolution of Its Photoproducts

2002 ◽  
Vol 85 (8) ◽  
pp. 2300-2315 ◽  
Author(s):  
Andrés H. Thomas ◽  
Gustavo Suárez ◽  
Franco M. Cabrerizo ◽  
Fernando S. García Einschlag ◽  
Raúl Martino ◽  
...  
Keyword(s):  
Folic Acid ◽  
Aqueous Solutions ◽  
Photochemical Behavior

Diamagnetic Susceptibilities of Various Inorganic Phosphates and Organic Phosphate Esters

1993 ◽  
Vol 66 (2) ◽  
pp. 371-373 ◽  
Author(s):  
Fujio Takahashi ◽  
Yasuzo Sakai ◽  
Toshihito Yoshida
Keyword(s):  
Organic Phosphate ◽  
Phosphate Esters ◽  
Inorganic Phosphates

Quaternary Heteroarenium Aldoximes as Catalysts for Cleavage of Phosphate Esters

1995 ◽  
Vol 60 (5) ◽  
pp. 883-893 ◽  
Author(s):  
František Hampl ◽  
Jiří Mazáč ◽  
František Liška ◽  
Jiří Šrogl ◽  
Lubomír Kábrt ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Critical Micellar Concentration ◽  
Considerable Effect ◽  
Phosphate Esters ◽  
Hexadecyltrimethylammonium Bromide ◽  
Hydrolytic Cleavage ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Diphenyl Phosphate ◽  
Hydrolysis Of

1-Methyl- (Ia - Id) and 1-dodecyl-2-, 3- and 4-hydroxyiminomethylpyridinium salts (Ie - Ih), as well as 1-methyl- (IIa) and 1-dodecyl-3-hydroxyiminomethylpyridazinium salts (IIb, IIc), were synthesized as catalysts for hydrolytic cleavage of organophosphates. The activities of the prepared catalysts were evaluated by measuring rate constants of hydrolysis of 4-nitrophenyl diphenyl phosphate (PNPDPP) under conditions of a pseudo-first-order reaction. The observed reactivity of pyridinium aldoximes Ia - Ih towards PNPDPP in neutral or slightly basic aqueous solutions (pH 7.2 and 7.8) depends on the acidity of the hydroxyimino group. The cleavage of PNPDPP is strongly accelerated in solutions of 1-dodecylhydroxyiminomethylpyridinium salts Ie - Ih above their critical micellar concentration (CMC). Considerable effect on the velocity of PNPDPP cleavage was observed when quaternary pyridinium aldoximes Ie - Ih were comicellized with inert cationic tenside hexadecyltrimethylammonium bromide (CTAB). 1-Dodecyl-3-hydroxyiminomethylpyridazinium salts IIb and IIc were unstable in aqueous solutions under the above-mentioned conditions.

scholarly journals CHLORIDE-DEPENDENT ORGANIC PHOSPHATE SENSITIVITY OF THE OXYGENATION REACTION IN CROCODILIAN HEMOGLOBINS

1994 ◽  
Vol 192 (1) ◽  
pp. 1-11 ◽  
Author(s):  
R Weber ◽  
F White
Keyword(s):  
Molecular Mechanisms ◽  
Feedback Regulation ◽  
Organic Phosphate ◽  
Alligator Mississippiensis ◽  
Phosphate Esters ◽  
Caiman Crocodilus ◽  
Allosteric Interaction ◽  
Allosteric Effector ◽  
Intensive Exercise ◽  
O2 Supply

We show that crocodilian hemoglobins (Hbs), which previously have been considered to be model pigments lacking allosteric interaction with organic phosphate esters, do exhibit oxylabile ATP and 2,3-diphosphoglycerate (DPG) binding that decreases O2 affinity and increases pH sensitivity (Bohr effect), in the absence of Cl- and at the low Cl- concentrations that may occur in crocodilian plasma during 'post-ingestive alkaline tides'. Hbs from different species vary in their phosphate sensitivities. In Alligator mississippiensis Hb, O2 affinity shows greater ATP than DPG sensitivity at low [cofactor]/[Hb] ratios. In Paleosuchus palpebrosus Hb, where even a high Cl- concentration (0.1 mol l-1) does not completely suppress the phosphate effects, the opposite is true, whereas both ATP and DPG exert similar effects in Caiman crocodilus Hb. Lactate, at concentrations that may occur after intensive exercise, similarly depresses Hb O2-affinity, indicating an O2 demand/O2 supply feedback regulation. Curiously, inositol hexaphosphate (IHP), a potent allosteric effector in other vertebrate Hbs, has no effect on A. mississippiensis and P. palpebrosus Hb and only small effects on C. crocodilus Hb, presumably because of steric hindrance at the binding site. The molecular mechanisms underlying the observations (particularly the implication of ss82-Lys, i.e. the lysine residue at position 82 of the ss-chains that binds phosphate and Cl-) are considered. Their physiological significance requires further study.

STUDIES ON THE PRESERVATION OF BLOOD: VII. THE INFLUENCE OF INOSINE ON THE METABOLIC BEHAVIOR OF THE ERYTHROCYTE DURING THE PRESERVATION OF BLOOD IN THE COLD

1959 ◽  
Vol 37 (1) ◽  
pp. 69-79
Author(s):  
D. Rubinstein ◽  
S. Kashket ◽  
Rhoda Blostein ◽  
O. F. Denstedt
Keyword(s):  
Cold Storage ◽  
Organic Phosphate ◽  
Phosphate Esters ◽  
Blood Samples ◽  
The Third ◽  
Duration Of Storage ◽  
The Difference ◽  
Blood Specimens ◽  
Metabolic Behavior ◽  
High Degree

Inosine, like other purine nucleosides when added to preserved blood specimens, induces a resynthesis of organic phosphate esters in the erythrocytes. Apart from the difference in rates of reaction, the metabolic reconstitution of the cells is the same at 37° and 4 °C. The reconstitution of the esters occurs rapidly even at 4 °C, and the higher the concentration of inosine added, the more prolonged is the maintenance of the esters. When inosine was added repeatedly to blood samples during storage, a phase of synthesis was induced with each addition of nucleoside. The capacity of the erythrocytes to resynthesize 2,3-diphosphoglyceric acid (DPG) remained normal regardless of the storage age of the sample but the capacity to replenish ATP decreased with the duration of storage. Addition of inosine at the end of the third week of cold storage can effect a high degree of restoration of metabolic viability in the cells at 4 °C within 24 hours.

Photochemical Behavior of 6-Methylpterin in Aqueous Solutions: Generation of Reactive Oxygen Species¶

2007 ◽  
Vol 81 (4) ◽  
pp. 793-801
Author(s):  
Franco M. Cabrerizo ◽  
Carolina Lorente ◽  
Mariana Vignonl ◽  
Romina Cabrerizo ◽  
Andrés H. Thomas ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solutions ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Photochemical Behavior

Photodegradation of Two Antibiotics Involved with Fe (III) and Marine Algae

2012 ◽  
Vol 260-261 ◽  
pp. 1047-1051
Author(s):  
Li Yun Ge ◽  
Yong Gang Huang ◽  
De Xiang Gao ◽  
Huan Huan Deng
Keyword(s):  
High Pressure ◽  
Aqueous Solutions ◽  
Marine Algae ◽  
Degradation Efficiency ◽  
Photochemical Degradation ◽  
Mercury Lamp ◽  
Platymonas Subcordiformis ◽  
Ciprofloxacin Hydrochloride ◽  
Initial Concentration ◽  
Photodegradation Rate

The photochemical degradation of two antibiotics, enrofloxacin and ciprofloxacin hydrochloride, was preliminarily studied under irradiation with a high-pressure mercury lamp (HMPL) in this paper. The influence of initial concentration of antibiotics, Fe (Ⅲ) and platymonas subcordiformis on the degradation efficiency of antibiotics were investigated. The results suggested that in the presence of P. subcordiformis, the degradation efficiency of enrofloxacin and ciprofloxacin hydrochloride were 85.0% and 84.2% in aqueous solutions underwent photodegradation under HMPL irradiation, respectively. Moreover, the lower initial concentration of antibiotics improved photodegradation rate of antibiotics.

A NEW SPECIFIC ANTIDOTE FOR ORGANIC PHOSPHATE ESTER POISONING

PEDIATRICS ◽  
1961 ◽  
Vol 28 (6) ◽  
pp. 950-955
Author(s):  
William T. Read ◽  
Mollie A. Combes
Keyword(s):  
Organic Phosphate ◽  
Phosphate Esters ◽  
Toxic Effects ◽  
Phosphate Ester ◽  
Accidental Ingestion

As the organic phosphate esters become more widely used, particularly in the home, intoxication from accidental ingestion will no doubt increase. For this reason a discussion of the toxic effects and treatment is presented. The signs, symptoms and treatment are summarized in the Tables.

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