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How Do the Valency and Radii of Cations Affect the Rheological Properties of Aqueous Solutions of Zwitterionic and Anionic Surfactant Mixtures?
Langmuir
January 2025
Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, ul. Berdychowo 4, PL 60-965 Poznan, Poland.
Despite extensive research on the use of salts to enhance micellar growth, numerous questions remain regarding the impact of ionic exchange and molecular structure on charge neutralization. This study looks into how certain cations (Na, Ca, and Mg) affect the structure of a cocamidopropyl betaine CAPB and sodium dodecylbenzenesulfonate SDBS surfactant mixture, aiming toward applications in targeted delivery systems. The mixture consists of a zwitterionic surfactant, cocamidopropyl betaine (CAPB), and an anionic surfactant, sodium dodecylbenzenesulfonate (SDBS), combined in varying molar ratios at a total concentration of 200 mM.
View Article and Find Full Text PDFOsteoclast visualization: Tartrate-resistant acid phosphatase activity staining using NewFuchsin compatible with non-aqueous mounting and tissue clearing.
MethodsX
June 2025
Laboratory of Cell and Tissue Biology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
Tartrate-resistant acid phosphatase (TRAP) staining is widely used to stain osteoclasts in histological bone sections. The red dye formed by the conventional TRAP enzymatic reaction using naphthol AS-MX (or AS-BI) phosphate and fast red-violet (or garnet) chromogens is readily soluble in alcohol or xylene and requires air-drying prior to cover slipping or the use of an aqueous mounting medium. However, the use of an aqueous mounting medium makes it difficult to store stained specimens for a long time.
View Article and Find Full Text PDFCu(I)-Induced G-quartets: Robust Supramolecular Polymers Exhibiting Heating-Induced Aqueous Phase Transitions into Gel or Precipitate.
Angew Chem Int Ed Engl
January 2025
NIT Rourkela: National Institute of Technology Rourkela, Department of Chemistry, NIT Rourkela, 769008, Rourkela, INDIA.
Certain proteins and synthetic covalent polymers experience aqueous phase transitions, driving functional self-assembly. Herein, we unveil the ability of supramolecular polymers (SPs) formed by G4.Cu+ to undergo heating-induced unexpected aqueous phase transitions.
View Article and Find Full Text PDFEquilibrium of monomers, dimers, and polymeric aggregates in the α-aryl-propionic acid-type analgesics naproxen, ketoprofen, and ibuprofen: Comparative study with oxicam-type meloxicam and piroxicam.
Int J Pharm
January 2025
Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
Hydrophobicity is associated with drug transport across membranes and is expressed as the partition coefficient log P for neutral drugs and the distribution coefficient log D for acidic and basic drugs. The log P and log D predictions are deductively (or with artificial intelligence) estimated as the sum of the partial contributions of the scaffold and substituents of a single molecule and are used widely and affirmatively. However, their predictions have not always been comprehensively accurate beyond scaffold differences.
View Article and Find Full Text PDFLyotropic "Salty" Tuning for Straightforward Diversification and Anisotropy in Hydrogel Actuators.
Langmuir
January 2025
Chemistry Department, Bilkent University, Ankara 06800, Turkey.
The specific ion effect (SIE), the control of polymer solubility in aqueous solutions by the added ions, has been a phenomenon known for more than a century. The seemingly simple nature of the ion-polymer-water interactions can lead to complex behaviors, which have also been exploited in many applications in biochemistry, electrochemistry, and energy harvesting. Here, we show an emerging diversification of actuation behaviors in "salty" hydrogel and hydrogel-paper actuators.
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