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Collection, Isolation and Enrichment of Naturally Occurring Magnetotactic Bacteria from the Environment

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Responsive coatings from naturally occurring pectin polysaccharides.

Zeinab Veisi¹, Nathan D Gallant², Norma A Alcantar¹

¹Department of Chemical and Biomedical Engineering, University of South Florida, 4202 E Fowler Ave, Tampa, FL 33620, USA.

Colloids and Surfaces. B, Biointerfaces

|January 20, 2019

Summary

Pectin coatings exhibit temperature-controlled swelling, shrinking as temperature rises due to dehydration. This tunable, natural material shows promise for applications like controlling cell adhesion.

Keywords:

High-methoxyl pectin Thermal-responsive coatings Tunable response Ultra-thin films Volume-phase transition

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Published on: June 14, 2021

Area of Science:

Materials Science
Polymer Chemistry
Biomaterials Engineering

Background:

Pectin polysaccharides are natural, non-toxic biopolymers with potential for advanced material applications.
Developing stimuli-responsive coatings is crucial for smart material design.

Purpose of the Study:

To investigate the thermally-cued swelling behavior of ultra-thin pectin coatings.
To explore the tunability of pectin coating responses for potential applications.

Main Methods:

Fabrication of ultra-thin pectin coatings cross-linked with calcium chloride (CaCl2).
Investigation of coating swelling using ellipsometry.
Analysis of temperature-induced transitions using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy.

Main Results:

Pectin coatings exhibited significant swelling (2-3 times dry thickness) at low temperatures.
A distinct hydrophilic-hydrophobic transition was observed with increasing temperature, attributed to pectin dehydration.
Coating swelling response was tunable by adjusting CaCl2 concentration and pH.

Conclusions:

Highly-esterified pectin coatings display tunable, temperature-responsive swelling behavior.
The observed transition is driven by dehydration of galacturonic acid residues.
These pectin coatings are promising for applications requiring controlled cell adhesion due to their non-toxic and responsive nature.