Synthesis and Characterisation of nanoparticles for encapsulation and release of volatile organic compounds.

Sunil, Nagpure Shruti (2025) Synthesis and Characterisation of nanoparticles for encapsulation and release of volatile organic compounds. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Nagpure Shruti Sunil (20MS156)) 20MS156_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

Nanoparticles with their large surface area, variable porosity and surface functionalization potential, have emerged as platforms for encapsulation and release of volatile organic compounds. In this study, mesoporous silica nanoparticles of the MCM-41 type (MCM-41-I and MCM-41-II) were synthesized and evaluated as carriers for encapsulation of geranyl acetate (GA), a naturally occurring volatile organic chemical found in plants. GA is crucial in regulating plant-insect interactions, particularly in recruiting natural enemies of herbivorous pests. However, its high volatility and susceptibility to environmental degradation limit its effectiveness in field settings. To address these issues, synthetic nanoparticles were synthesized to encapsulate GA and allow for their prolonged, regulated release over an extended time. This slow-release technique aims to enhance biological pest management by continuously slowly releasing volatiles that attract beneficial insects. Bracon brevicornis is a generalist parasitoid wasp that feeds on a variety of lepidopteran larvae. B. brevicornis uses herbivore-induced plant volatiles such as GA to find its hosts. The nanoparticle-based delivery method enhances the attraction and retention of these parasitoids by maintaining a steady presence of this attractant in the agricultural environment, contributing to an eco-friendly, sustainable alternative to chemical pest management. A carrier comparison found that MCM-41-I outperformed MCM-41-II and kaolinite in terms of encapsulation efficiency and extended-release duration. These findings emphasize the importance of surface engineering in enhancing nanocarrier performance and identify MCM-41-I as the most effective technology for controlling the release of GA in agricultural pest management.

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