scholarly journals Transport and cycling of iron and hydrogen peroxide in a freshwater stream: Influence of organic acids

2003 ◽  
Vol 39 (11) ◽  
Author(s):  
Durelle T. Scott ◽  
Robert L. Runkel ◽  
Diane M. McKnight ◽  
Bettina M. Voelker ◽  
Briant A. Kimball ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Acids ◽  
Freshwater Stream

CONDUCTIVITY DATA OF AQUEOUS MIXTURES OF HYDROGEN PEROXIDE AND ORGANIC ACIDS

1931 ◽  
Vol 4 (1) ◽  
pp. 35-38 ◽  
Author(s):  
W. H. Hatcher ◽  
M. G. Sturrock
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Acids ◽  
Aqueous Mixtures ◽  
Conductivity Data ◽  
Aqueous Hydrogen Peroxide ◽  
Preliminary Results

Preliminary results obtained by measuring changes in conductivity of organic acids mixed with aqueous hydrogen peroxide show a rapid though measurable progression to the attainment of a maximum or minimum within an hour. These establish previous findings, and afford a clue to the conductivity of organic peracids.

Photooxidation of Guaiacol to Organic Acids with Hydrogen Peroxide by Microwave Discharge Electrodeless Lamps

2015 ◽  
Vol 39 (1) ◽  
pp. 97-101 ◽  
Author(s):  
Dajie Zhang ◽  
Binzhe Sun ◽  
Lian Duan ◽  
Yufang Tao ◽  
Aihua Xu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Acids ◽  
Microwave Discharge

Uji Antifungi Susu Fermentasi Komersial pada Candida non-albicans

SCISCITATIO ◽  
2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Nur Khikmah ◽  
Nunung Sulistyani
Keyword(s):  
Hydrogen Peroxide ◽  
Lactic Acid ◽  
Antifungal Activity ◽  
Lactic Acid Bacteria ◽  
Organic Acids ◽  
Oral Candidiasis ◽  
Fermented Milk ◽  
Plate Count ◽  
Diffusion Method ◽  
Total Plate Count

Bakteri Asam Laktat (BAL) yang terkandung dalam susu fermentasi akan menghasilkan asam-asam organik, hidrogen peroksida, diasetil, asetaldehid, asetoin, reutinin, reuterisiklin dan bakteriosin, dapat sebagai anti-Candida. Spesies Candida non-albicans seperti C. tropicalis dan C. glabrata sebagai penyebab kandidiasis oral cenderung meningkat. Tujuan penelitian ini mengetahui aktivitas antifungi susu fermentasi komersial pada Candida non-albicans dan viabilitas bakteri asam laktat di dalam susu fermentasi komersial. Aktivitas antifungi pada Candida non-albicans dilakukan dengan metode difusi sumuran. Viabilitas bakteri asam laktat dihitung berdasarkan jumlah bakteri asam laktat sebagai jumlah bakteri total (Total Plate Count). Hasil penelitian menunjukkan bahwa susu fermentasi komersial lebih mampu menghambat C. tropicalis dibandingkan C. glabrata. Viabilitas bakteri asam laktat dalam susu fermentasi komersial 107-1010 CFU/mL. Lactic Acid Bacteria (LAB) contained in fermented milk will produce organic acids, hydrogen peroxide, diacetyl, acetaldehyde, acetoin, reutinin, reuterycline and bacteriocin, as anti-Candida. Candida non-albicans species such as C. tropicalis and C. glabrata as causes of oral candidiasis tend to increase. The aim of this research was to determine the antifungal activity of commercial fermented milk against Candida non-albicans and viability of lactic acid bacteria in commercial ermented milk. The antifungal activity was determined using well diffusion method. Viability of lactic acid bacteria is calculated as Total Plate Count. The results showed that commercial fermented milk was more able to inhibit C. tropicalis compared C. glabrata. Viability of lactic acid bacteria 107-1010 CFU/mL.

scholarly journals Manganese Peroxidase-Dependent Oxidation of Glyoxylic and Oxalic Acids Synthesized by Ceriporiopsis subvermispora Produces Extracellular Hydrogen Peroxide

1998 ◽  
Vol 64 (1) ◽  
pp. 68-73 ◽  
Author(s):  
Ulises Urzúa ◽  
Philip J. Kersten ◽  
Rafael Vicuña
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Acids ◽  
Manganese Peroxidase ◽  
Specific Activity ◽  
Extracellular Fluid ◽  
In Vitro Assays ◽  
Phenol Red ◽  
Ceriporiopsis Subvermispora ◽  
Production Of Hydrogen

ABSTRACT The ligninolytic system of the basidiomycete Ceriporiopsis subvermispora is composed of manganese peroxidase (MnP) and laccase. In this work, the source of extracellular hydrogen peroxide required for MnP activity was investigated. Our attention was focused on the possibility that hydrogen peroxide might be generated by MnP itself through the oxidation of organic acids secreted by the fungus. Both oxalate and glyoxylate were found in the extracellular fluid ofC. subvermispora cultures grown in chemically defined media, where MnP is also secreted. The in vivo oxidation of oxalate was measured; 14CO2 evolution was monitored after addition of exogenous [14C]oxalate to cultures at constant specific activity. In standard cultures, evolution of CO2 from oxalate was maximal at day 6, although the MnP titers were highest at day 12, the oxalate concentration was maximal (2.5 mM) at day 10, and the glyoxylate concentration was maximal (0.24 mM) at day 5. However, in cultures containing low nitrogen levels, in which the pH is more stable, a better correlation between MnP titers and mineralization of oxalate was observed. Both MnP activity and oxidation of [14C]oxalate were negligible in cultures lacking Mn(II). In vitro assays confirmed that Mn(II)-dependent oxidation of [14C]oxalate by MnP occurs and that this reaction is stimulated by glyoxylate at the concentrations found in cultures. In addition, both organic acids supported phenol red oxidation by MnP without added hydrogen peroxide, and glyoxylate was more reactive than oxalate in this reaction. Based on these results, a model is proposed for the extracellular production of hydrogen peroxide by C. subvermispora.

CONDUCTIVITY DATA OF AQUEOUS MIXTURES OF HYDROGEN PEROXIDE AND ORGANIC ACIDS. II.

1932 ◽  
Vol 7 (3) ◽  
pp. 270-282
Author(s):  
W. H. Hatcher ◽  
E. C. Powell
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Acids ◽  
Hydrogen Peroxide Solution ◽  
Aqueous Mixtures ◽  
Conductivity Data ◽  
Aqueous Hydrogen Peroxide

The conductivities of formic, acetic, propionic and succinic acids and succinic monoperacid have been studied in water and in aqueous hydrogen peroxide solution. These acids all add hydrogen peroxide to form un-ionized complexes which later, with time, lose water to form the so-called peracids of negligible conductivity. The formation of such complexes is dependent solely on the concentration of reagents, the peracid being produced subsequently by loss of water.

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