Physicochemical Characterization of Inorganic Pigments in the Presence of Gaseous Pollutants. The Role of Ozone

2002 ◽  
Vol 216 (11) ◽  
Author(s):  
V. Siokos ◽  
J. Kapolos ◽  
F. Roubani-Kalantzopoulou
Keyword(s):  
Gas Chromatography ◽  
Physicochemical Characterization ◽  
Gaseous Pollutants ◽  
Inorganic Pigments ◽  
Reversed Flow ◽  
Volatile Hydrocarbons

The Reversed–Flow Gas Chromatography technique was used to study the interaction of volatile hydrocarbons on three inorganic pigments, namely, CdS, ZnS and Cr

scholarly journals Effective intercalation of zein into Na-montmorillonite: role of the protein components and use of the developed biointerfaces

2016 ◽  
Vol 7 ◽  
pp. 1772-1782 ◽  
Author(s):  
Ana C S Alcântara ◽  
Margarita Darder ◽  
Pilar Aranda ◽  
Eduardo Ruiz-Hitzky
Keyword(s):  
Water Solution ◽  
Physicochemical Characterization ◽  
Layered Silicate ◽  
Aqueous Dispersion ◽  
Underlying Mechanism ◽  
Ethanol Medium ◽  
Major Storage Protein ◽  
Protein Components

Biohybrid materials based on the intercalation of zein, the major storage protein in corn, into sodium-exchanged montmorillonite were prepared following two synthesis strategies. The first one made use of zein dissolved in 80% (v/v) ethanol/water solution, the usual solvent for this protein, while the second method is new and uses a sequential process that implies the previous separation of zein components in absolute ethanol. This treatment of zein with ethanol renders a soluble yellow phase and an agglomerate of insoluble components, which are able to intercalate the layered silicate when an aqueous dispersion of montmorillonite is added to the ethanol medium containing both phases. The diverse steps in this second route were investigated individually in order to understand the underlying mechanism that drives to the intercalation of this complex hydrophobic biomacromolecule into the hydrophilic interlayer space of sodium-exchanged montmorillonite. In addition to physicochemical characterization of the resulting materials, these biohybrid interfaces were also evaluated as biofillers in the preparation of diverse ecofriendly nanocomposites.

scholarly journals Ru@hyperbranched Polymer for Hydrogenation of Levulinic Acid to Gamma-Valerolactone: The Role of the Catalyst Support

2022 ◽  
Vol 23 (2) ◽  
pp. 799
Author(s):  
Svetlana A. Sorokina ◽  
Stepan P. Mikhailov ◽  
Nina V. Kuchkina ◽  
Alexey V. Bykov ◽  
Alexander L. Vasiliev ◽  
...  
Keyword(s):  
Levulinic Acid ◽  
Catalyst Support ◽  
Physicochemical Characterization ◽  
Significant Loss ◽  
Catalyst Loading ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Low Catalyst Loading

Hydrogenation of levulinic acid (LA) obtained from cellulose biomass is a promising path for production of γ-valerolactone (GVL)—a component of biofuel. In this work, we developed Ru nanoparticle containing nanocomposites based on hyperbranched pyridylphenylene polymer, serving as multiligand and stabilizing matrix. The functionalization of the nanocomposite with sulfuric acid significantly enhances the activity of the catalyst in the selective hydrogenation of LA to GVL and allows the reaction to proceed under mild reaction conditions (100 °C, 2 MPa of H2) in water and low catalyst loading (0.016 mol.%) with a quantitative yield of GVL and selectivity up to 100%. The catalysts were successfully reused four times without a significant loss of activity. A comprehensive physicochemical characterization of the catalysts allowed us to assess structure-property relationships and to uncover an important role of the polymeric support in the efficient GVL synthesis.

scholarly journals Physicochemical characterization of the pulp oil of bacuri Attalea phalerata Mart. ex Spreng. (Arecaceae)

2020 ◽  
Vol 21 (3) ◽  
pp. 1-11
Author(s):  
Michelle Cardoso Coimbra ◽  
Débora Maria Moreno Luzia ◽  
Neuza Jorge
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Refractive Index ◽  
Fatty Acid ◽  
Potassium Hydroxide ◽  
High Performance ◽  
Physicochemical Characterization ◽  
Physicochemical Characteristics ◽  
Total Phenolic

The aim of the study was to characterize the pulp oil of bacuri Attalea phalerata Mart. ex Spreng. (Arecaceae) according to official analytical methods. Total phenolic and carotenoids contents were evaluated by spectrophotometry, and tocopherols composition by high-performance liquid chromatography. The fatty acid profile was obtained through gas chromatography from samples transesterified with potassium hydroxide in methanol and n-hexane. According to the proximate composition, bacuri pulp contained 41.5 % carbohydrates and 39.2 % lipids. Regarding its physicochemical properties, the oil showed a free fatty acids content of 0.7 %, a peroxide value of 1.4 meq/kg, a refractive index of 1.463, an iodine number of 84.3 g I2/100 g, a saponification number of 193.5 mg KOH/g, an unsaponifiable matter of 0.5 %, and 48.7 h of oxidative stability. Total phenolic, carotenoids, and tocopherols contents recorded values of 2.4 mg GAE/g, 243.0 µg/g, and 86.8 mg/kg, respectively. The bacuri oil showed a fatty acid composition similar to olive oil and a high percentage of unsaturation, finding 67.3 % of monounsaturated acids, and 11.3 % of polyunsaturated acids. The main fatty acids were oleic (67.3 %), palmitic (13.3 %), and linoleic (10.5 %). Due to its physicochemical characteristics, bacuri oil has a great potential to be used in food preparations, such as salad oil or in margarine formulation.

scholarly journals Physical Characterization-Chemistry of Essential Oil of Oregano in 6 Communities of the Municipality of Rodeo, Dgo.

2019 ◽  
pp. 18-23
Author(s):  
R.I. Marín-Tinoco. ◽  
O. Silva-Marrufo ◽  
M.C. González-Güereca.
Keyword(s):  
Gas Chromatography ◽  
Water Vapor ◽  
Essential Oil ◽  
Physicochemical Characterization ◽  
Index Of Refraction ◽  
Chemical Components ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Significant Difference

The municipality of Rodeo is one of the largest oregano producers in the state of Durango, reporting an average of 100 tons per year, which are used as a condiment and there is no use in its entirety. The objective of the present work was Physicochemical Characterization of Essential Oil of Oregano (AEO) in 6 communities of the municipality of Rodeo Durango, the methodology was carried out by dragging with water vapor, where quality and quantity of oil were controlled, using the leaves of The oregano plant, the density, was determined by means of a pycnometer and the index of refraction by means of a refractometer (Master Refractometer). The results obtained for the index of refraction of the oils of the 6 localities circle between 1.47-1.50 which indicates an acceptable purity in the (AEO). The density of oils circle between 0.91-0.92. The chemical components were read by gas chromatography and a Flame Ionization Detector (FID), where a higher percentage of concentration on the carvacrol compound was reported, which circulated between 60-70% while the compound Thymol was between 30-40%. A statistical analysis was performed to determine if there was a significant difference between the concentration of the analytes based on the height of the sample obtaining a significance >5, which indicates a difference between the data.

The modulation of physicochemical characterization of innovative liposomal platforms: the role of the grafted thermoresponsive polymers

2015 ◽  
Vol 22 (3) ◽  
pp. 330-335 ◽  
Author(s):  
Maria Chountoulesi ◽  
Aimilia Kyrili ◽  
Natassa Pippa ◽  
Anastasia Meristoudi ◽  
Stergios Pispas ◽  
...  
Keyword(s):  
Physicochemical Characterization ◽  
Thermoresponsive Polymers
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