Ionic Surfactants as Assembly Crosslinkers Triggered Supramolecular Membrane with 2D↔3D Conversion under Multiple Stimulus

2021 ◽  
Author(s):  
Xuejiao Wang ◽  
Chunlian Yang ◽  
Pengbo Song ◽  
Maodong Li ◽  
Yuxin Liu ◽  
...  
Keyword(s):  
Ionic Surfactants ◽  
Multiple Stimulus

Adsorption of ionic and non-ionic surfactants by wool charring waste

1981 ◽  
Vol 31 (1) ◽  
pp. 395-400 ◽  
Author(s):  
Francis Perineau ◽  
Antoine Gaset
Keyword(s):  
Ionic Surfactants

Artemisinin (ART) Drug Delivery Using Mixed Non-ionic Surfactants and Evaluation of Their Efficiency in Different Cancer Cell Lines

2017 ◽  
Vol 4 (4) ◽  
Author(s):  
Elnaz Asgharkhani ◽  
Aazam Najmafshar ◽  
Mohsen Chiani
Keyword(s):  
Zeta Potential ◽  
Cell Line ◽  
Mtt Assay ◽  
Therapeutic Index ◽  
Stability Study ◽  
Polydispersity Index ◽  
Ionic Surfactants ◽  
Cytotoxicity Test ◽  
Molar Ratios ◽  
Chemotherapy Agent

This study aims to investigate the effects of different non-ionic surfactants on physicochemical properties of ART niosomes. ART is a natural compound that is used as an antimalarial and chemotherapy agent in medicine. ART has low bioavailability, stability and solubility. In order to solve these problems and enhancing the efficiency of the drug, nanotechnology was used. In the present study, several niosomal formulations of ART prepared using different molar ratios of Span 60 : Tween 60 : PEG-600: ART in PBS. These three formulations were FI (1:1:0.5:0.5), FII (2:1:0.5:0.5) and FIII (1:2:0.5:0.5), respectively. The encapsulation efficiency was measured by HPLC and the drug release was evaluated by dialysis method. The cytotoxicity test was determined by MTT assay. The size, zeta potential and polydispersity index of the vesicles was measured by Zeta Sizer. Stability study was performed within two months. The MTT assay results showed that cytotoxicity effect of these formulations on MCF-7 cell line is better than C6 cell line and the FIII had the best results for both of them. The entrapment efficiencies of the formulations I, II and III were obtained 82.2±1.88%, 75.5±0.92% and 95.5±1.23%, respectively. The results of size, zeta potential and polydispersity index indicated that the size of the vesicles is below 200 nm, their surface charge is about -35 mV and they were monodisperse. Stability and release study indicated that the formulation III has the best stability and release pattern. Therefore, the use of PEGylated niosomal ART can effectively improve its therapeutic index, stability and solubility.

Resolving visual and conceptual interference among object concepts requires medial temporal lobe cortex

2019 ◽  
Author(s):  
Danielle M. Douglas ◽  
Louisa Lok Yee Man ◽  
Rachel N. Newsome ◽  
Haley Park ◽  
Hira M. Aslam ◽  
...  
Keyword(s):  
Medial Temporal Lobe ◽  
Single Case ◽  
Brain Lesion ◽  
Semantic Features ◽  
Prefrontal Cortical ◽  
Visual Interference ◽  
Multiple Stimulus ◽  
Feature Overlap ◽  
Visually Based ◽  
High Degree

Semantic features, such as prototypical visual form or function, are often shared across multiple object concepts. How, then, are we able to resolve interference between object concepts that look alike but perform different functions (e.g., hairdryer and gun) or that do similar things but look rather dissimilar (e.g., hairdryer and comb)? We examined this issue in the current neuropsychological single-case study by asking whether perirhinal cortex (PRC) critically enables resolution of interference among object concepts at the level of their conceptually- and visually-based semantic features. We tested three patients with differing lesion profiles using a novel discrimination task involving stimuli for which visual and conceptual similarity were not linked across object concepts. We found that D.A., an individual with a brain lesion that includes PRC, was impaired at discriminating among object concepts when there was a high degree conceptual and visual semantic feature overlap among choices. We replicated this result in a second testing session. Conversely, patients with selective hippocampal or ventromedial prefrontal cortical lesions were unimpaired on this task. Importantly, D.A.’s performance was intact when (i) conceptual and visual interference among object concepts was minimized, and (ii) when the discriminations involved simple stimuli that did not require assessment of multiple stimulus dimensions. These results reveal a novel semantic deficit in a patient with PRC damage, suggesting that this structure represents object concepts in a manner that can be flexibly reshaped to emphasize task relevant semantic features.

scholarly journals A KBr-impregnated paper substrate as a sample probe for the enhanced ATR-FTIR signal strength of anionic and non-ionic surfactants in an aqueous medium

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40428-40441
Author(s):  
Ramsingh Kurrey ◽  
Manas Kanti Deb ◽  
Kamlesh Shrivas ◽  
Jayant Nirmalkar ◽  
Bhupendra Kumar Sen ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Signal Strength ◽  
Flow Diagram ◽  
Ionic Surfactants ◽  
Paper Substrate

Flow diagram of the procedures for the analysis of surfactants using modified GFF paper substrate.

scholarly journals Hot Compressed Water Pretreatment and Surfactant Effect on Enzymatic Hydrolysis Using Agave Bagasse

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4746
Author(s):  
Marcela Sofia Pino ◽  
Michele Michelin ◽  
Rosa M. Rodríguez-Jasso ◽  
Alfredo Oliva-Taravilla ◽  
José A. Teixeira ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Production Efficiency ◽  
Alcoholic Beverage ◽  
Enzymatic Saccharification ◽  
Raw Material ◽  
Tween 20 ◽  
Ionic Surfactants ◽  
Peg 400 ◽  
Water Pretreatment ◽  
Hot Compressed Water

Agave bagasse is a residual biomass in the production of the alcoholic beverage tequila, and therefore, it is a promising raw material in the development of biorefineries using hot compressed water pretreatment (hydrothermal processing). Surfactants application has been frequently reported as an alternative to enhance monomeric sugars production efficiency and as a possibility to reduce the enzyme loading required. Nevertheless, the surfactant’s action mechanisms in the enzymatic hydrolysis is still not elucidated. In this work, hot compressed water pretreatment was applied on agave bagasse for biomass fractionation at 194 °C in isothermal regime for 30 min, and the effect of non-ionic surfactants (Tween 20, Tween 80, Span 80, and Polyethylene glycol (PEG 400)) was studied as a potential enhancer of enzymatic saccharification of hydrothermally pretreated solids of agave bagasse (AGB). It was found that non-ionic surfactants show an improvement in the conversion yield of cellulose to glucose (100%) and production of glucose (79.76 g/L) at 15 FPU/g glucan, the highest enhancement obtained being 7% regarding the control (no surfactant addition), using PEG 400 as an additive. The use of surfactants allows improving the production of fermentable sugars for the development of second-generation biorefineries.

Sign in / Sign up

Export Citation Format

Share Document