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Updated: May 6, 2026

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

Published on: March 21, 2014

A cellulosic responsive "living" membrane.

Guokui Qin¹, Bruce J Panilaitis, Zhongyuan Sun David L Kaplan

¹Department of Biomedical Engineering, 4 Colby Street, Tufts University, Medford, MA 02155, USA.

Carbohydrate Polymers

|November 6, 2013

Summary

This summary is machine-generated.

Researchers created a novel "living membrane" using bacterial cellulose and engineered bacteria for highly sensitive molecule detection. This biomaterial system enhances biological detection capabilities for various applications.

Keywords:

Bacterial cellulose Co-cultivation Gene amplifier Living membrane Positive feedback

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Published on: March 1, 2016

Area of Science:

Biomaterials Science
Synthetic Biology
Biotechnology

Background:

Bacterial cellulose (BC) is a versatile biomaterial with unique properties, widely used in biomedical fields.
Developing rapid, specific, and sensitive methods for biological molecule detection remains a challenge.
Recombinant Escherichia coli (E. coli) offers potential for biological detection systems.

Purpose of the Study:

To develop a novel
living membrane
system for enhanced biological detection.
To investigate the compatibility of Gluconacetobacter xylinus and recombinant E. coli for co-cultivation.
To engineer a positive-feedback genetic amplifier for signal amplification in the living membrane system.

Main Methods:

Co-cultivation of G. xylinus and recombinant E. coli strains.
Entrapment of recombinant E. coli within bacterial cellulose membranes.
Confocal microscopy to observe fluorescent signals and E. coli density.
Design and implementation of a positive-feedback genetic amplifier circuit.

Main Results:

Demonstrated compatibility between G. xylinus and recombinant E. coli for co-cultivation.
Established a correlation between entrapped E. coli numbers and inducible signal levels.
Achieved highly sensitive detection with significant fluorescent signals from single receptor binding events due to the genetic amplifier.

Conclusions:

The developed living membrane system, integrating bacterial cellulose and engineered E. coli, enables highly sensitive biological and chemical detection.
This innovative biomaterial platform facilitates the creation of more complex devices for advanced sensing applications.
The system holds promise for future advancements in biosensing and diagnostics.