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Creating Transient Cell Membrane Pores Using a Standard Inkjet Printer
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Digitally Controlled Printing of Bioink Barriers for Paper-Based Analytical Devices: An Environmentally Friendly

Pedro V V Romanholo1, Larissa M de Andrade1, Habdias A Silva-Neto1

  • 1Instituto de Química, Universidade Federal de Goiás, 74690-900 Goiânia, Goiás, Brazil.

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|March 30, 2024
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Summary

Researchers developed a simple, eco-friendly method using a natural resin bioink to create durable hydrophobic barriers for paper-based devices (PADs). This low-cost technique offers superior resistance for various sensing applications.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Biotechnology

Background:

  • Paper-based analytical devices (PADs) offer a low-cost platform for diagnostics.
  • Patterning hydrophilic paper with hydrophobic materials is crucial for PAD fabrication.
  • Existing methods for creating hydrophobic barriers have limitations in cost, eco-friendliness, or performance.

Purpose of the Study:

  • To develop a novel, automated, and eco-friendly method for creating robust hydrophobic barriers on paper.
  • To utilize a bioink derived from natural rosin for fabricating these barriers.
  • To demonstrate the adaptability and superior performance of these barriers in various applications.

Main Methods:

  • Fabrication of a bioink using commercially available natural rosin.
  • Delivery of the bioink via a ballpoint pen, integrated with a cutting printer for semi-automated barrier creation.
  • Optimization of barrier properties using digital control, machine learning, and design of experiments.
  • Testing barrier performance in aqueous pH sensing and colorimetric detection under harsh conditions.

Main Results:

  • A low-cost, eco-friendly, and readily available method for creating highly hydrophobic barriers on paper.
  • Barriers demonstrated superior water and organic solvent resistance compared to wax-printing and permanent markers.
  • Optimized barrier strength was achieved through digital control and machine learning.
  • Successful application of barriers in wide-range pH sensing and colorimetric detection of cholecalciferol under acidic/organic conditions.

Conclusions:

  • The rosin-based bioink provides an effective and sustainable solution for fabricating hydrophobic barriers in paper-based devices.
  • The developed method is versatile, scalable, and offers tunable barrier properties for diverse analytical applications.
  • This approach represents a significant advancement in the field of paper-based diagnostics, enhancing device robustness and functionality.