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Related Concept Videos

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Fabrication of Size-Controlled and Emulsion-Free Chitosan-Genipin Microgels for Tissue Engineering Applications
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Biodegradable redox sensitive chitosan based microgels for potential agriculture application.

Ankita Dhiman1, Dimpy Bhardwaj1, Kajal Goswami1

  • 1School of Chemical Sciences and Advanced Materials Research Centre, Indian Institute of Technology Mandi, Himachal Pradesh 175075, India.

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Summary

New biodegradable microgels deliver insecticides and capture heavy metals. These 2,3-dihydroxybenzoic acid (DH)-functionalized chitosan/stearic acid microgels (DH-ChSt MGs) offer controlled release and plant nutrient supply, showing promise for agricultural applications.

Keywords:
Agrochemicals deliveryChitosanFoliar adhesionMicrogelsRedox sensitiveSoil remedy

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Area of Science:

  • Biomaterials Science
  • Agricultural Chemistry
  • Nanotechnology

Background:

  • Developing sustainable materials for agriculture is crucial.
  • Controlled delivery systems can improve pesticide efficacy and reduce environmental impact.
  • Heavy metal contamination and nutrient deficiencies pose significant challenges in agriculture.

Purpose of the Study:

  • To synthesize and characterize redox-sensitive, biodegradable microgels for dual agricultural applications.
  • To evaluate the controlled release of insecticide and the heavy metal ion-capturing capabilities of the developed microgels.
  • To assess the biocompatibility and plant adhesion properties of the functionalized microgels.

Main Methods:

  • Synthesis of 2,3-dihydroxybenzoic acid (DH) functionalized chitosan/stearic acid microgels (DH-ChSt MGs) via disulfide crosslinking.
  • Characterization of microgel size (≈146 nm) and encapsulation efficiency (≈85%) for imidacloprid insecticide.
  • In vitro release studies under reducing conditions and foliar adhesion tests on pea leaves.
  • Iron(III) ion (Fe3+) chelation and heavy metal ion binding assays.
  • Cytotoxicity assessment using MTT assay.

Main Results:

  • DH-ChSt MGs demonstrated high loading (≈8%) and encapsulation efficiency (≈85%) for imidacloprid.
  • Prolonged insecticide release (≈75% after 133 h) was observed under reducing conditions.
  • Enhanced foliar adhesion on pea leaves and efficient Fe3+ chelation were achieved.
  • Reduced DH-ChSt MGs showed capability for binding heavy metal ions.
  • MTT assays confirmed the non-toxicity of DH-ChSt MGs up to 120 μg/mL.

Conclusions:

  • DH-ChSt MGs are biodegradable, redox-sensitive nanomaterials suitable for controlled insecticide delivery.
  • The microgels effectively chelate Fe3+ for plant nutrition and capture heavy metal ions.
  • The developed formulation presents a promising, non-toxic platform for sustainable agricultural applications.