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Engineering luminescent pectin-based hydrogel for highly efficient multiple sensing.

Karen Yuanting Tang1, Lu Jiang1, Jayven Chee Chuan Yeo1

  • 1Institute of Materials Research and Engineering, Agency for Science, Technology, and Research (A*STAR), 2 Fusionopolis Way, Innovis, 138634, Singapore.

International Journal of Biological Macromolecules
|November 4, 2020
PubMed
Summary
This summary is machine-generated.

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This study developed luminescent tough hydrogels using pectin, PVA, carbon dots, and lanthanide ions. These novel materials exhibit tunable luminescence and sensitive responses to pH and metal ions for advanced sensing applications.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Analytical Chemistry

Background:

  • Luminescent hydrogels offer versatile sensing capabilities, but intrinsic pectin hydrogels possess weak mechanical properties and limited functionalities.
  • Developing stimuli-responsive luminescent materials is crucial for advanced applications.
  • Pectin and polyvinyl alcohol (PVA) are biocompatible polymers that can form hydrogels, but require modification for enhanced performance.

Purpose of the Study:

  • To create luminescent tough hydrogels by incorporating lanthanide ions and silk fibroin-derived carbon dots into a Pectin/PVA hydrogel (PPH) matrix.
  • To tune the hydrogel's luminescence by adjusting the ratio of blue-emitting carbon dots to red-emitting Eu3+ and green-emitting Tb3+ ions.
  • To investigate the stimuli-responsive properties of the fabricated luminescent Pectin/PVA hydrogel (LPPH), specifically its response to pH and metal ions.
Keywords:
Chromic responseIntegrated luminescent emittersPectin hydrogelSensing applicationStimuli-responsive

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Main Methods:

  • Fabrication of Pectin/PVA hydrogel (PPH) and subsequent incorporation of lanthanide ions and silk fibroin-derived carbon dots to form luminescent Pectin/PVA hydrogel (LPPH).
  • Tuning of luminescence color by adjusting the ratio of carbon dots to Eu3+ and Tb3+ ions.
  • Evaluation of mechanical properties and investigation of chromic responses to external stimuli (pH, metal ions).
  • Quantification of pH response by measuring the ratio of luminescent intensity at 473 nm and 617 nm (I473/I617).
  • Demonstration of specific detection of Cu2+ and Fe3+ ions and proposal of sensing mechanisms.

Main Results:

  • Successfully synthesized luminescent tough hydrogels (LPPH) with tunable luminescence by incorporating carbon dots and lanthanide ions into Pectin/PVA hydrogel.
  • The incorporation of emitters minimally impacted the mechanical properties of the tough hydrogel.
  • LPPH exhibited sensitive chromic responses to pH variations, quantifiable via luminescence intensity ratios (I473/I617).
  • Specific and sensitive detection of Cu2+ and Fe3+ ions was achieved, with distinct responses to Fe2+ and Fe3+.

Conclusions:

  • The developed luminescent tough Pectin/PVA hydrogel (LPPH) offers tunable luminescence and robust mechanical properties.
  • LPPH demonstrates high sensitivity and selectivity for pH and specific metal ion detection (Cu2+, Fe3+).
  • The distinct chromic responses to different iron oxidation states highlight the potential of LPPH for sophisticated multi-analyte sensing applications.