Development of a sustainable nano-emulsion system for targeted drug delivery using biocompatible polymers

Project Abstract

This study presents the development and evaluation of a sustainable nano-emulsion system engineered for targeted delivery of therapeutic agents using biocompatible polymers. The core objective was to create a robust formulation that combines environmental sustainability with clinical efficacy, addressing both eco-friendly materials and precise pharmacokinetics. Aqueous-phase stabilization was achieved using naturally derived surfactants and biopolymers (e.g., chitosan, alginate derivatives) to minimize cytotoxicity and long-term tissue accumulation. The oil phase utilized medium-chain triglycerides aligned with GRAS (Generally Recognized As Safe) status, enabling scalable production and reduced environmental impact. A high-pressure homogenization approach followed by ultrasonication was optimized to yield nano-emulsions with mean diameters below 120 nm, narrow polydispersity indices, and transparent to slightly opalescent appearances suitable for intravenous or subcutaneous administration. Surface modification strategies employed ligand-conjugated polymers and biodegradable PEGylation to enhance passive tumor targeting via enhanced permeability and retention (EPR) effects, while actively engaging receptor-mediated uptake through chosen ligand-receptor pairs identified from prior in silico screening and in vitro validation. The encapsulation efficiency and loading capacity for model drugs, including hydrophobic chemotherapeutics and hydrophilic macromolecules, were systematically evaluated under varying process parameters to maximize stability and payload retention under physiological shear and proteolytic conditions. Stability studies encompassed thermal, oxidative, and photostress testing, along with accelerated aging to forecast shelf-life under tropical and temperate climates, ensuring minimal degradation of both the carrier matrix and the encapsulated drug. Release kinetics were characterized in simulated physiological media, revealing a biphasic profile an initial burst release followed by a sustained, zero-order-like release over extended periods, highly tunable via polymer crosslinking density and the oil-to-water ratio. In vitro cytotoxicity assays demonstrated selective cytocompatibility with healthy cell lines and enhanced cytotoxic effects on target cancer cell lines when loaded with doxorubicin and paclitaxel analogs, particularly in nano-emulsions exhibiting targeted ligand density. In vivo pharmacokinetic and biodistribution studies in rodent models indicated prolonged circulation half-lives and preferential accumulation in tumor tissues, corroborated by imaging modalities and histopathology. Environmental life cycle assessment comparing the developed system to conventional synthetic formulations indicated reductions in toxic byproducts, solvent usage, and energy input due to process optimization and renewable materials sourcing. The final formulation exhibited scalable manufacturing potential, with reproducible batch-to-batch characteristics and compliance with regulatory parameters for phase I clinical translation. This work advances the field of targeted nanomedicine by delivering a sustainable, biocompatible, and efficacious nano-emulsion platform capable of modular drug loading, precise targeting, and favorable safety and environmental profiles.

Project Overview

What This Project Is About

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A beginner-friendly, plain-language overview of creating tiny carriers (nano-emulsions) that can deliver medicines directly to specific parts of the body. The project combines safe fats and polymers to form stable, tiny droplets that carry drugs and release them where needed, improving effectiveness and reducing side effects.

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The Problem It Addresses

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Many drugs do not reach their target in the body, may hurt healthy tissues, or break down before they reach the right place. Conventional delivery methods can be inefficient or unsafe. This project explores a sustainable, biocompatible way to protect drugs inside tiny droplets and guide them to the intended site.

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Objectives of the Project

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1. Understand what nano-emulsions are and why biocompatible polymers matter.
2. Design a stable nano-emulsion system using safe ingredients.
3. Test how well the system carries a model drug and protects it in conditions similar to the body.
4. Evaluate how the system releases the drug over time.
5. Assess the environmental and safety aspects of the materials used.

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What You Will Do Step by Step

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1. Review basic literature on nano-emulsions and biocompatible polymers.
2. Select suitable materials and prepare small batches of nano-emulsions.
3. Characterize droplet size, stability, and surface properties.
4. Incorporate a simple drug model and study loading efficiency.
5. Run stability tests under different temperatures and pH levels.
6. Study drug release profiles over time.
7. Analyze data to identify the most stable formulation.
8. Discuss safety, sustainability, and potential applications.

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Expected Outcome

Clear data on a safe, stable nano-emulsion system that can carry a model drug and release it predictably. The project should demonstrate a feasible approach to targeted, sustainable drug delivery with potential for further refinement and real-world use.