scholarly journals Determination of Porphyrin-Induced Peroxidation of Plant Lipids by Oxygen Electrode.

2000 ◽  
Vol 45 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Mototsugu Yanagida ◽  
Hiroshi Matsumoto ◽  
Kenji Usui
Keyword(s):  
Oxygen Electrode ◽  
Plant Lipids

Determination of aeration capacity of bubbled column type fermentors with oxygen electrode

1978 ◽  
Vol 43 (3) ◽  
pp. 713-718 ◽  
Author(s):  
Jaroslav Votruba ◽  
Miroslav Sobotka ◽  
Aleš Prokop
Keyword(s):  
Oxygen Electrode ◽  
Column Type ◽  
Aeration Capacity

Determination of Aspartame in Beverages Using an Alcohol Oxidase Enzyme Electrode

1989 ◽  
Vol 72 (1) ◽  
pp. 30-33
Author(s):  
Vicki J Smith ◽  
Richard A Green ◽  
Thomas R Hopkins
Keyword(s):  
Liquid Chromatography ◽  
Standard Deviation ◽  
Methyl Ester ◽  
Alcohol Oxidase ◽  
Ester Group ◽  
Oxygen Electrode ◽  
Artificial Sweetener ◽  
Relative Standard ◽  
Oxidase Enzyme

Abstract A new method for the determination of the artificial sweetener aspartame is described. α-Chymotrypsin is used to cleave the methyl ester group of aspartame, producing methanol hydrolytically. The methanol is detected using an electrode which is constructed by physically trapping yeast alcohol oxidase enzyme at the tip of a dissolved oxygen electrode. The decrease in oxygen concentration, which occurs as methanol is enzymatically oxidized to formaldehyde, is measured amperometrically. Aspartame levels in diet soft drinks as determined by the proposed method and by liquid chromatography are in excellent agreement. The relative standard deviation of the measurements is 0.83%. The methanol present in diet cola as a result of aspartame degradation can also be measured by using the electrode without α-chymotrypsin.

Inhibition of yeast respiration and fermentation by benomyl, carbendazim, isocyanates, and other fungicidal chemicals

1987 ◽  
Vol 33 (2) ◽  
pp. 157-161 ◽  
Author(s):  
Mikio Chiba ◽  
Alan W. Bown ◽  
David Danic
Keyword(s):  
Carbon Dioxide ◽  
Parent Compound ◽  
Oxygen Electrode ◽  
Breakdown Product ◽  
Carbon Dioxide Release ◽  
Saccharomyces Cerevesiae ◽  
Manometric Determination

The inhibition of yeast (Saccharomyces cerevesiae) metabolism by fungicidal chemicals was investigated. Glucose- or ethanol-dependent yeast respiration was measured with an oxygen electrode, and manometric determination of carbon dioxide release was used to measure fermentation. Both respiration and fermentation were inhibited more by benomyl than by identical molar concentrations of its breakdown product, carbendazim. Butyl isocyanate, another benomyl breakdown product, inhibited respiration more but inhibited fermentation less than the parent compound. Of the isocyanates tested, hexyl isocyanate was the most inhibitory towards both activities. Captan was more active and iprodione less active than benomyl. Because benomyl rapidly broke down to carbendazim when it was prepared in 80% ethanol, only 59% of the dissolved benomyl was intact when it was added to yeast to determine its effect on respiration or fermentation.

An Enzymic Method for the Determination of Bilirubin Using an Oxygen Electrode

2000 ◽  
Vol 12 (4) ◽  
pp. 292-295 ◽  
Author(s):  
Johanna Klemm ◽  
Mamas I. Prodromidis ◽  
Miltiades I. Karayannis
Keyword(s):  
Oxygen Electrode

Examination of the potential of copper during its dissolution in sodium hydroxide

1981 ◽  
Vol 46 (12) ◽  
pp. 3057-3062 ◽  
Author(s):  
Petr Sušinka ◽  
Milica Miadoková
Keyword(s):  
Quantitative Determination ◽  
Sodium Hydroxide ◽  
Oxygen Electrode ◽  
Quantitative Relation ◽  
Experimental Conditions ◽  
Kinetic Measurements ◽  
Crystallographic Planes ◽  
The Given ◽  
Spontaneous Reaction

Parallel to kinetic measurements, the potential of copper was monitored on the (100), (110), and (111) crystallographic planes during its spontaneous reaction in sodium hydroxide in oxygen atmosphere. A quantitative relation was obtained for the potential in dependence on the experimental conditions, indicating that unless a passivating layer of copper(II) oxide is formed on the surface, the metal does not act as an oxygen electrode. The potential change in the given medium was found to depend only on the amount of copper(I) oxide formed, obeying the relation E = (RT/nF) ln (mCu2O) + K; use was made of this relation for a quantitative determination of the growth of the copper(I) oxide layer.

A biosensor based on Thiobacillus thioparus for measuring thiosulfate and methanethiol

1995 ◽  
Vol 41 (4-5) ◽  
pp. 366-371 ◽  
Author(s):  
Izumi Kubo ◽  
Isao Karube ◽  
Toshifumi Takeuchi ◽  
Masako Furusawa ◽  
Yoshiko Arikawa ◽  
...  
Keyword(s):  
Flow Injection ◽  
Oxygen Electrode ◽  
Injection System ◽  
Sensor Output ◽  
Thiobacillus Thioparus ◽  
Microbial Sensor ◽  
Batch System ◽  
System Output ◽  
Flow Injection System

A biosensor based on Thiobacillus thioparus was developed for the determination of thiosulfate and methanethiol. Thiobacillus thioparus is a chemoautotrophic bacterium and it oxidizes sulfur compounds to sulfuric acid. The sensor consisted of an oxygen electrode and immobilized T. thioparus. When the sensor was used to determine thiosulfate, a linear relation between sensor output and concentration was obtained for the concentration range from 1 to 100 μM in a batch system and from 1 to 10 mM in a flow injection system. Output of the sensor was stable for more than 1 month. For methanethiol, the response of the sensor was measured for the concentration range from 0.2 to 3 mM in a flow injection system.Key words: microbial sensor, thiosulfate, methanethiol, Thiobacillus thioparus TK-m.

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