Associative pH sensitive system
Related Experiment Video
Updated: Aug 18, 2026

Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)
Published on: July 30, 2020
Noëlle Martine Gosselet1, Véronique Wintgens, Catherine Amiel
1Laboratoire de Recherche sur les Polymères, U. M. C7581, CNRS, 2-8 rue Henri Dunant, 94320 Thiais, France. gosselet@glvt-cnrs.fr
Abstract:
New associative pH sensitive systems composed of a modified dextran bearing 2-carboxycyclohexyl carboxyl groups and neutral (p betaCD) or positively charged (p betaCDN(+))beta-cyclodextrin-co-epichlorhydrin copolymers have been synthesized and their properties were investigated as a function of pH by phase diagrams and viscosimetry. The affinity between the CD cavities and the hydrophobic guests (2-carboxycyclohexyl carboxyl groups) has been studied as a function of pH. The system with the neutral p betaCD shows a pH dependent behavior due to the lowest affinity of the guest at pH above 5 for the cavity. Associative phase separation is produced at low pH whereas soluble complexes occur at higher pH. The opposite trend is observed with the system containing the cationic p betaCDN(+). This behavior is due to the combination of electrostatic and inclusion complex interactions in this system. Addition of salt, by screening the electrostatic interactions, also strongly influences the response of the system.
More Related Videos
08:28Automated Multimodal Stimulation and Simultaneous Neuronal Recording from Multiple Small Organisms
Published on: March 3, 2023
11:50Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
Published on: October 1, 2015
Related Concept Videos
Sensory Perception: Organization of the Somatosensory System
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
What is a Sensory System?
Postsynaptic Potential (PSP)
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
Conditioned Taste Aversion
A notable characteristic of conditioned taste aversion is that it often requires only a single exposure...
Other Stress Responses in Bacteria
Sympathetic Activation