Competitive adsorption of three phenolic compounds to hydrophilic urea-formaldehyde macroporous foams derived from lignin-based Pickering HIPEs template

RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 93894-93904 ◽  
Author(s):  
Jianming Pan ◽  
Jialu Luo ◽  
Jun Cao ◽  
Jinxing Liu ◽  
Wei Huang ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Competitive Adsorption ◽  
Urea Formaldehyde ◽  
Internal Phase ◽  
Oil In Water

Hydrophilic urea-formaldehyde macroporous foams (UFMF) were simply synthesized by templating oil-in-water Pickering high internal phase emulsions (HIPEs) solely stabilized by lignin particles.

Nanoemulsions Loaded with Amphotericin B: Development, Characterization and Leishmanicidal Activity

2019 ◽  
Vol 25 (14) ◽  
pp. 1616-1622 ◽  
Author(s):  
Gabriela Muniz Félix Araújo ◽  
Gabriela Muniz Félix Araújo ◽  
Alana Rafaela Albuquerque Barros ◽  
Alana Rafaela Albuquerque Barros ◽  
João Augusto Oshiro-Junior ◽  
...  
Keyword(s):  
Amphotericin B ◽  
Average Diameter ◽  
Isopropyl Myristate ◽  
Neglected Diseases ◽  
Clinical Form ◽  
Hydrophobic Compounds ◽  
Internal Phase ◽  
Oil In Water ◽  
Spherical Structures ◽  
Lipid Formulations

Leishmaniasis is one of the most neglected diseases in the world. Its most severe clinical form, called visceral, if left untreated, can be fatal. Conventional therapy is based on the use of pentavalent antimonials and includes amphotericin B (AmB) as a second-choice drug. The micellar formulation of AmB, although effective, is associated with acute and chronic toxicity. Commercially-available lipid formulations emerged to overcome such drawbacks, but their high cost limits their widespread use. Drug delivery systems such as nanoemulsions (NE) have proven ability to solubilize hydrophobic compounds, improve absorption and bioavailability, increase efficacy and reduce toxicity of encapsulated drugs. NE become even more attractive because they are inexpensive and easy to prepare. The aim of this work was to incorporate AmB in NE prepared by sonicating a mixture of surfactants, Kolliphor® HS15 (KHS15) and Brij® 52, and an oil, isopropyl myristate. NE exhibited neutral pH, conductivity values consistent with oil in water systems, spherical structures with negative Zeta potential value, monomodal size distribution and average diameter of drug-containing droplets ranging from 33 to 132 nm. AmB did not modify the thermal behavior of the system, likely due to its dispersion in the internal phase. Statistically similar antileishmanial activity of AmB-loaded NE to that of AmB micellar formulation suggests further exploring them in terms of toxicity and effectiveness against amastigotes, with the aim of offering an alternative to treat visceral leishmaniasis.

scholarly journals Lignosulphonates as an Alternative to Non-Renewable Binders in Wood-Based Materials

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4196
Author(s):  
Sofia Gonçalves ◽  
João Ferra ◽  
Nádia Paiva ◽  
Jorge Martins ◽  
Luísa H. Carvalho ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Aromatic Ring ◽  
Phenol Formaldehyde ◽  
Urea Formaldehyde ◽  
Value Added ◽  
Wood Adhesives ◽  
Renewable Source ◽  
Pressing Time ◽  
Value Added Products ◽  
Total Market

Lignin is a widely abundant renewable source of phenolic compounds. Despite the growing interest on using it as a substitute for its petroleum-based counterparts, only 1 to 2% of the global lignin production is used for obtaining value-added products. Lignosulphonates (LS), derived from the sulphite pulping process, account for 90% of the total market of commercial lignin. The most successful industrial attempts to use lignin for wood adhesives are based on using this polymer as a partial substitute in phenol-formaldehyde or urea-formaldehyde resins. Alternatively, formaldehyde-free adhesives with lignin and lignosulphonates have also been developed with promising results. However, the low number of reactive sites available in lignin’s aromatic ring and high polydispersity have hindered its application in resin synthesis. Currently, finding suitable crosslinkers for LS and decreasing the long pressing time associated with lignin adhesives remains a challenge. Thus, several methods have been proposed to improve the reactivity of lignin molecules. In this paper, techniques to extract, characterize, as well as improve the reactivity of LS are addressed. The most recent advances in the application of LS in wood adhesives, with and without combination with formaldehyde, are also reviewed.

Effect of germination time on antioxidative activity and composition of yellow pea soluble free and polar soluble bound phenolic compounds

2019 ◽  
Vol 10 (10) ◽  
pp. 6840-6850
Author(s):  
Minwei Xu ◽  
Zhao Jin ◽  
Jae-Bom Ohm ◽  
Paul Schwarz ◽  
Jiajia Rao ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Antioxidative Activity ◽  
Polar Solvent ◽  
Water Emulsion ◽  
Germination Time ◽  
Oil In Water ◽  
Yellow Peas ◽  
Oil In Water Emulsion

This research aims to study antioxidative activities of polar solvent extractable phenolic compounds from yellow peas with different germination times against oil-in-water emulsion oxidation.

scholarly journals High Internal Phase Oil-in-Water Pickering Emulsions Stabilized by Chitin Nanofibrils: 3D Structuring and Solid Foam 

2020 ◽  
Vol 12 (9) ◽  
pp. 11240-11251 ◽  
Author(s):  
Ya Zhu ◽  
Siqi Huan ◽  
Long Bai ◽  
Annika Ketola ◽  
Xuetong Shi ◽  
...  
Keyword(s):  
Pickering Emulsions ◽  
Internal Phase ◽  
Oil In Water

Porous functional poly(unsaturated polyester-co-glycidyl methacrylate-co-divinylbenzene) polyHIPE beads through w/o/w multiple emulsions: preparation, characterization and application

e-Polymers ◽  
2014 ◽  
Vol 14 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Emine Hilal Mert ◽  
Hüseyin Yıldırım
Keyword(s):  
Glycidyl Methacrylate ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Aminosalicylic Acid ◽  
Adsorption Method ◽  
Multiple Emulsions ◽  
Adsorption Capacities ◽  
Internal Phase ◽  
Oil In Water ◽  
Post Functionalization

AbstractPoly(unsaturated polyester-co-glycidyl methacrylate-co-divinylbenzene) poly high internal phase emulsion (HIPE) beads were synthesized via water-in-oil-in-water (w/o/w) multiple emulsions. HIPEs were prepared by using a commercial unsaturated polyester resin (UPR) and a mixture of glycidyl methacrylate (GMA) and divinylbenzene (DVB) as the cross-linker. The external surfactant was found to be a strong influence on the morphology of the beads. The porosity and the pore morphology of the resulting polyHIPE beads were investigated by scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) molecular adsorption method, respectively. Post-functionalization of the beads was carried out with multifunctional amines such as 1,4-ethylenediamine (EDA), 1,6-hexamethylenediamine (HMDA) and 4-aminosalicylic acid (ASA). Elemental analysis was used to confirm the functionalization. Resulting functional beads were tested on the adsorption of Ag(I), Cu(II), and Cr(III) under non-competitive conditions and atomic absorption spectroscopy (AAS) was used to calculate the adsorption capacities. The maximum adsorption capacities of the functional beads were found to be decreasing in the order of Ag(I)>Cu(II)>Cr(III).

Preparation of inverse polymerized high internal phase emulsions using an amphiphilic macro-RAFT agent as sole stabilizer

2016 ◽  
Vol 7 (9) ◽  
pp. 1803-1812 ◽  
Author(s):  
Aminreza Khodabandeh ◽  
R. Dario Arrua ◽  
Christopher T. Desire ◽  
Thomas Rodemann ◽  
Stefan A. F. Bon ◽  
...  
Keyword(s):  
Continuous Phase ◽  
Dispersed Phase ◽  
Internal Phase ◽  
Oil In Water ◽  
Monomer Solution ◽  
Raft Agent

Oil-in-water (‘inverse’) High Internal Phase Emulsions (HIPEs) have been prepared using an amphiphilic macro-RAFT agent with toluene as the internal dispersed phase (∼80 vol%) and an aqueous monomer solution as the continuous phase.

Kinetics of chitosan hydrogel formation in high internal phase oil-in-water emulsions (HIPEs) using viscoelastic measurements

Soft Matter ◽  
2013 ◽  
Vol 9 (36) ◽  
pp. 8678 ◽  
Author(s):  
Jonathan Miras ◽  
Susana Vílchez ◽  
Conxita Solans ◽  
Tharwat Tadros ◽  
Jordi Esquena
Keyword(s):  
Chitosan Hydrogel ◽  
Internal Phase ◽  
Oil In Water ◽  
Hydrogel Formation ◽  
Kinetics Of
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