Electrochemical degradation of a methyl paraben and propylene glycol mixture: Interference effect of competitive oxidation and pH stability

Chemosphere ◽  
2021 ◽  
pp. 132229
Author(s):  
Dawany Dionisio ◽  
Manuel A. Rodrigo ◽  
Artur J. Motheo
Keyword(s):  
Propylene Glycol ◽  
Interference Effect ◽  
Ph Stability ◽  
Electrochemical Degradation ◽  
Methyl Paraben

scholarly journals Competitive Anodic Oxidation of Methyl Paraben and Propylene Glycol: Keys to Understand the Process

2018 ◽  
Vol 6 (3) ◽  
pp. 771-778 ◽  
Author(s):  
Dawany Dionisio ◽  
Artur J. Motheo ◽  
Cristina Sáez ◽  
Pablo Cañizares ◽  
Manuel A. Rodrigo
Keyword(s):  
Propylene Glycol ◽  
Anodic Oxidation ◽  
Methyl Paraben

scholarly journals Formulation and Evaluation of Herbal Topical Gel Containing Leaves Extract of Andrographis paniculata

2020 ◽  
Vol 10 (1) ◽  
pp. 48-51
Author(s):  
Aney Joice Samuel ◽  
Nida Mulla
Keyword(s):  
Key Words ◽  
Propylene Glycol ◽  
Leaf Extract ◽  
Physical Appearance ◽  
Andrographis Paniculata ◽  
Distilled Water ◽  
Alcoholic Extract ◽  
Methyl Paraben ◽  
Propyl Paraben ◽  
Topical Gel

Objective: The present study has been undertaken with the aim to formulate and evaluate the gel contaning leaf extract of Andrographis Paniculata. Methodology and results: The formulation was designed by using alcoholic extract of leaves of Andrographis paniculata.The gel was prepared by using  carbapol 934, triethanolamine, propylene glycol, methyl paraben, propyl paraben and required amount of distilled water. The prepared gel was evaluated for physical appearance, pH, spread ability, viscosity, extrudability, albumin denaturation assay and stability. Conclusion: Carbopol gels with dried leaves extract of Andrographis paniculata could be prepared successfully. Key words: Topical gel,Kalmegh, Spreadability, Albumin denaturation

Electrochemical Degradation of Methyl Paraben Using a Boron-Doped Diamond Anode

2019 ◽  
Vol 43 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Juliana R. Steter ◽  
Dawany Dionísio ◽  
Robson S. Rocha ◽  
Douglas W. Miwa ◽  
Marcos R. Lanza ◽  
...  
Keyword(s):  
Electrochemical Degradation ◽  
Boron Doped Diamond ◽  
Methyl Paraben ◽  
Boron Doped

Molecular dynamics of poly(propylene) glycol in nanometer confinements

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-271-Pr7-274 ◽  
Author(s):  
A. Schönhals ◽  
H. Goering ◽  
K.-W. Brzezinka ◽  
Ch. Schick
Keyword(s):  
Molecular Dynamics ◽  
Propylene Glycol ◽  
Poly Propylene

Hydrogenolysis of glucose and fructose in glycol solutions over CuO-MgO-ZrO2 catalyst

2020 ◽  
pp. 48-55
Author(s):  
M.E. Sharanda ◽  
◽  
E.A. Bondarenko ◽  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Flow Reactor ◽  
General Trend ◽  
Raw Materials ◽  
Reaction Products ◽  
Renewable Raw Materials ◽  
High Partial Pressure ◽  
Zro2 Catalyst ◽  
Phase Process

Ethylene glycol and propylene glycol are important representatives of polyols. On an industrial scale, they are obtained from petrochemical raw materials. Within a decade, significant efforts were made for the producing of polyols from biologically renewable raw materials - carbohydrates. The general trend for carbohydrate hydrogenolysis includes application of liquid-phase process with the use of modified metal-oxide catalysts, at 120-120 ° C and pressure of 3MPa or above. So high pressure is used for the reason to increase hydrogen solubility, and also due to the high partial pressure of low boiling solvents. We supposed that usage of high boiling solvents could allow hydrogenolysis to be performed at the lower pressure. Ethylene glycol and propylene glycol are of particular interest as such kind of solvent since they are both the main products of glucose hydrogenolysis. In this work, the process of hydrogenolysis of glucose and fructose over Cu / MgO-ZrO2 catalyst have been studied at temperature range of 160-200 °C and a pressure of 0.1-0.3 MPa in a flow reactor. The solvents were simultaneously the target products of the reaction - ethylene glycol and / or propylene glycol. Gas chromatography and 13C NMR were used for the reaction products identification. It was found that the solubility of glucose in propylene glycol is 21 % by weight, and in ethylene glycol 62% by weight. It was pointed out that the process of hydrogenolysis can take place at a pressure close to atmospheric. Under these conditions, the conversion of hexoses reaches 96-100 %. The reaction products are preferably propylene glycol and ethylene glycol. The total selectivity for C3-2 polyols is 90-94 %, that is higher than in the hydrogenolysis of glucose in aqueous solution.

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