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Biphasic Coacervation Controlled by Kinetics as Studied by De Novo-Designed Peptides.
Langmuir
January 2025
Beijing National Laboratory for Molecular Sciences, Department of Polymer Science and Engineering and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Coacervation is generally treated as a liquid-liquid phase separation process and is controlled mainly by thermodynamics. However, kinetics could make a dominant contribution, especially in systems containing multiple interactions. In this work, using peptides of (XXLY)SSSGSS to tune the charge density and the degree of hydrophobicity, as well as to introduce secondary structures, we evaluated the effect of kinetics on biphasic coacervates formed by peptides with single-stranded oligonucleotides and quaternized dextran at varying pH values.
View Article and Find Full Text PDFCorrelation of Phase Structure, Defect Relaxation, and Microwave Dielectric Properties in Low-Loss MgTiO Ceramic Systems.
ACS Appl Mater Interfaces
January 2025
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Low-loss microwave dielectrics are of significant importance for the miniaturization and integration of microwave devices. In this paper, the ceramics of nominal composition MgTiO ( = 3-6) are synthesized, and the correlations among their phase compositions, defect behaviors, and microwave dielectric properties are systematically investigated. The analyses indicate that the MgTiO ceramics are a biphasic system consisting of hexagonal ilmenite-structured MgTiO and cubic spinel-structured MgTiO.
View Article and Find Full Text PDFContinuous Production of Bifunctional Platform Chemicals from Plant Oils in Water by Cyclodextrin-Mediated Hydroformylation.
ChemSusChem
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TU Dortmund University: Technische Universitat Dortmund, Biochemical and Chemical Engineering, Emil-Figge-Straße 66, 44227, Dortmund, GERMANY.
Platform chemicals from renewable resources with broad applications are highly desirable, particularly for replacing fossil-based monomers. Bifunctional aliphatic ester-aldehydes, accessible via regioselective hydroformylation of unsaturated oleochemicals, can be converted into linear ω-amino/ω-hydroxy esters and dicarboxylic acids-key building blocks for biobased aliphatic polycondensates. However, their success hinges on efficient, economically viable production, with catalyst recycling being critical.
View Article and Find Full Text PDFFormation of water-in-water emulsions and microgels in nonionic surfactant + gelatin aqueous mixtures.
J Colloid Interface Sci
January 2025
Institute of Advanced Chemistry of Catalonia (IQAC), Consejo Superior de Investigaciones Científicas (CSIC), Jordi Girona, 18-26, 08034 Barcelona, Spain; Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN, ISCIII), Jordi Girona, 18-26, 08034 Barcelona, Spain. Electronic address:
Article Synopsis
- The study proposes that water-in-water (W/W) emulsions can be created by mixing a polymer and a surfactant, leading to phase segregation when the surfactant's cloud temperature is lowered.
- Experiments involved using an ethoxylated triglyceride surfactant (Kolliphor ELP) with gelatin, where the gelatin reduced the surfactant's cloud temperature, allowing for two distinct aqueous phases to form.
- The findings reveal that this is the first documented case of W/W emulsions formed with a polymer-surfactant mixture, achieving stability through chemically crosslinked microgels and the incorporation of mucin particles.
Can Magnoflorine Improve Memory? Immunohistochemical Studies on Parvalbumin Immunoreactive Neurons and Fibers of Mice Hippocampus.
Nutrients
December 2024
Department of Pharmacognosy with Medicinal Plant Garden, Medical University in Lublin, 1 Chodzki St., 20-093 Lublin, Poland.
: We assessed the influence of long-term injection of magnoflorine (MAG) on memory acquisition in mice for the first time. : This isoquinoline alkaloid that belongs to the aporphines was isolated from the roots of by centrifugal partition chromatography (CPC) using a biphasic solvent system composed of chloroform: methanol: water in the ratio 4:3:3 (//) with 20 mM of hydrochloric acid and triethylamine, within 64 min. : Our results indicated that long-term injection of MAG 20 mg/kg dose improve the long-term memory acquisition in mice that were evaluated in the passive avoidance (PA) test with no toxicity records.
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