A thermostable substance from lettuce seeds and seedlings inhibiting β-indolyl-acetic acid oxidation

1960 ◽  
Vol 16 (1) ◽  
pp. 29-30 ◽  
Author(s):  
Shulamith Blumenthal-Goldschmidt
Keyword(s):  
Acetic Acid ◽  
Acid Oxidation ◽  
Lettuce Seeds ◽  
Indolyl Acetic Acid

scholarly journals Effect of Ascorbic Acid and Indolyl Acetic Acid on Regeneration of Willow Branches and Germination

Nature ◽  
1936 ◽  
Vol 137 (3467) ◽  
pp. 618-618 ◽  
Author(s):  
W. DAVIES ◽  
G. A. ATKINS ◽  
P. C. B. HUDSON
Keyword(s):  
Ascorbic Acid ◽  
Acetic Acid ◽  
Indolyl Acetic Acid

scholarly journals Self-generated peroxyacetic acid in phosphoric acid plus hydrogen peroxide pretreatment mediated lignocellulose deconstruction and delignification

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Dong Tian ◽  
Yiyi Chen ◽  
Fei Shen ◽  
Maoyuan Luo ◽  
Mei Huang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Synergistic Effect ◽  
Phosphoric Acid ◽  
Wheat Straw ◽  
Lignin Degradation ◽  
Acid Oxidation ◽  
Main Function ◽  
Corn Stalk ◽  
Peroxyacetic Acid

Abstract Background Peroxyacetic acid involved chemical pretreatment is effective in lignocellulose deconstruction and oxidation. However, these peroxyacetic acid are usually artificially added. Our previous work has shown that the newly developed PHP pretreatment (phosphoric acid plus hydrogen peroxide) is promising in lignocellulose biomass fractionation through an aggressive oxidation process, while the information about the synergistic effect between H3PO4 and H2O2 is quite lack, especially whether some strong oxidant intermediates is existed. In this work, we reported the PHP pretreatment system could self-generate peroxyacetic acid oxidant, which mediated the overall lignocellulose deconstruction, and hemicellulose/lignin degradation. Results The PHP pretreatment profile on wheat straw and corn stalk were investigated. The pathways/mechanisms of peroxyacetic acid mediated-PHP pretreatment were elucidated through tracing the structural changes of each component. Results showed that hemicellulose was almost completely solubilized and removed, corresponding to about 87.0% cellulose recovery with high digestibility. Rather high degrees of delignification of 83.5% and 90.0% were achieved for wheat straw and corn stalk, respectively, with the aid of peroxyacetic acid oxidation. A clearly positive correlation was found between the concentration of peroxyacetic acid and the extent of lignocellulose deconstruction. Peroxyacetic acid was mainly self-generated through H2O2 oxidation of acetic acid that was produced from hemicellulose deacetylation and lignin degradation. The self-generated peroxyacetic acid then further contributed to lignocellulose deconstruction and delignification. Conclusions The synergistic effect of H3PO4 and H2O2 in the PHP solvent system could efficiently deconstruct wheat straw and corn stalk lignocellulose through an oxidation-mediated process. The main function of H3PO4 was to deconstruct biomass recalcitrance and degrade hemicellulose through acid hydrolysis, while the function of H2O2 was to facilitate the formation of peroxyacetic acid. Peroxyacetic acid with stronger oxidation ability was generated through the reaction between H2O2 and acetic acid, which was released from xylan and lignin oxidation/degradation. This work elucidated the generation and function of peroxyacetic acid in the PHP pretreatment system, and also provide useful information to tailor peroxide-involved pretreatment routes, especially at acidic conditions. Graphical abstract

A Direct Determination of Rubber Hydrocarbon. Chromic Acid Oxidation Method

1943 ◽  
Vol 16 (3) ◽  
pp. 660-667 ◽  
Author(s):  
V. L. Burger ◽  
W. E. Donaldson ◽  
J. A. Baty
Keyword(s):  
Acetic Acid ◽  
Chromic Acid ◽  
Direct Determination ◽  
Acid Oxidation ◽  
Laboratory Procedure ◽  
Oxidation Method ◽  
Chromic Acid Oxidation

Abstract A method for the direct determination of rubber is reported. This method utilizes the property of rubber hydrocarbon when oxidized by chromic acid to form definite and reproducible amounts of acetic acid. This determination has been reduced to a comparatively simple laboratory procedure, whose accuracy (in the absence of interferences) is 1 to 2 per cent.

scholarly journals Influence of the formulation of catalysts deposited on cordierite monoliths for acetic acid oxidation

2018 ◽  
Vol 21 (3-4) ◽  
pp. 182-193 ◽  
Author(s):  
Henri-Joël Sedjame ◽  
Rachid Brahmi ◽  
Gwendoline Lafaye ◽  
Jacques Barbier ◽  
Céline Fontaine
Keyword(s):  
Acetic Acid ◽  
Acid Oxidation

scholarly journals Indole-3-Acetic Acid Oxidation and Crocin Bleaching by Horseradish Peroxidase

1988 ◽  
Vol 86 (4) ◽  
pp. 1310-1314 ◽  
Author(s):  
Wolfgang F. Osswald ◽  
Wolfgang Schütz ◽  
Erich F. Elstner
Keyword(s):  
Acetic Acid ◽  
Horseradish Peroxidase ◽  
Acid Oxidation ◽  
Indole 3 Acetic Acid

scholarly journals Mechanism of indole-3-acetic acid oxidation by plant peroxidases: anaerobic stopped-flow spectrophotometric studies on horseradish and tobacco peroxidases

1996 ◽  
Vol 313 (3) ◽  
pp. 841-847 ◽  
Author(s):  
Irina G. GAZARYAN ◽  
L. Mark LAGRIMINI ◽  
Gillian A. ASHBY ◽  
Roger N. F. THORNELEY
Keyword(s):  
Acetic Acid ◽  
General Scheme ◽  
Specific Interaction ◽  
Acid Oxidation ◽  
Oxidative Decarboxylation ◽  
Stopped Flow ◽  
Strictly Anaerobic ◽  
Peroxidase Isoenzyme ◽  
Plant Peroxidases ◽  
Indole 3 Acetic Acid

Indole-3-acetic acid (IAA) is a powerful plant growth regulator. The oxidative decarboxylation of IAA by plant peroxidases is thought to be a major degradation reaction involved in controlling the in vivo level of IAA. Horseradish peroxidase isoenzyme C and an anionic tobacco peroxidase isolated from transgenic Nicotiana sylvestris have been used in experiments in vitro designed to determine the mechanism of IAA oxidation. In particular, the initial reduction of ferric to ferrous enzyme, a key step in previously proposed mechanisms, has been investigated by rapid-scan stopped-flow spectrophotometry under strictly anaerobic conditions and at defined oxygen concentrations. The data provide the first evidence for a ternary complex comprising peroxidase, IAA and oxygen that is kinetically competent both at the initiation stage and during the catalytic cycle of IAA oxidation. A general scheme describing the oxidative cycles of both anionic and cationic peroxidases is proposed that includes native ferric enzyme and compound II as kinetically competent intermediates. For anionic peroxidases, addition of hydrogen peroxide switches on the oxidative cycle thereby promoting IAA oxidation. 2-Methyl-IAA is not a substrate of the oxidase reaction, suggesting a specific interaction between plant peroxidases and IAA.

Inhibition of enzymatic indole-3-acetic acid oxidation by phenols

1994 ◽  
Vol 36 (2) ◽  
pp. 263-267 ◽  
Author(s):  
Sergey N. Krylov ◽  
Svetlana M. Krylova ◽  
Igor G. Chebotarev ◽  
Alla B. Chebotareva
Keyword(s):  
Acetic Acid ◽  
Acid Oxidation ◽  
Indole 3 Acetic Acid

DEMS Study of the Acetic Acid Oxidation on Boron-Doped Diamond Eelectrode

2008 ◽  
Vol 155 (7) ◽  
pp. E96 ◽  
Author(s):  
Agnieszka Kapałka ◽  
Barbora Lanova ◽  
Helmut Baltruschat ◽  
György Fóti ◽  
Christos Comninellis
Keyword(s):  
Acetic Acid ◽  
Acid Oxidation ◽  
Boron Doped Diamond ◽  
Boron Doped
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