Synthesis and Characterization of Biodegradable Polymers from Renewable Resources for Controlled Drug Release

Project Abstract

This study reports the design, synthesis, and comprehensive characterization of biodegradable polymers derived from renewable resources for application in controlled drug release. The work integrates monomer selection from bio-based feedstocks, such as lactic acid, glycolic acid, and plant-derived polyols, with sustainable polymerization strategies to yield materials possessing tunable degradation profiles, mechanical properties, and drug diffusion characteristics. A systematic approach was employed to optimize polymer synthesis via polymerization techniques including ring-opening polymerization and polycondensation, followed by end-group modification to tailor hydrophobicity and crystallinity. The resulting polymers were subjected to an array of physicochemical analyses, including Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography (GPC) for molecular weight distribution, differential scanning calorimetry (DSC) for thermal transitions, thermogravimetric analysis (TGA) for thermal stability, and scanning electron microscopy (SEM) for morphological assessment of bulk and microparticulate forms. Biocompatibility and biodegradability were evaluated through in vitro enzymatic degradation assays and simulated physiological conditions to determine mass loss, molecular weight reduction, and surface erosion behavior over time. Hydrolytic degradation studies were conducted in phosphate-buffered saline (PBS, pH 7.4) at 37°C, complemented by accelerated aging conditions to project long-term performance. The impact of copolymer composition, crystallinity, and molecular weight on drug loading efficiency and release kinetics was investigated using model therapeutics with diverse physicochemical properties, including hydrophilic and hydrophobic drugs. Drug release profiles were characterized by UV-Vis spectroscopy and high-performance liquid chromatography (HPLC), employing mathematical modeling to delineate diffusion-controlled, degradation-mediated, and anomalous transport mechanisms. The study also explores surface modification and formulation strategies, such as nanoparticle encapsulation and hydrogel composites, to achieve zero- to near-zero-order release, minimize initial burst release, and extend therapeutic windows. The polymers demonstrated rapid initiation of biodegradation under physiological conditions with controllable erosion rates aligned to clinically relevant timeframes, enabling sustained drug delivery while reducing the need for repeat dosing. Importantly, the renewable-resource origin confers reduced environmental impact and improved supply chain resilience. Cytotoxicity assays using human cell lines indicated minimal adverse effects at therapeutic concentrations, supporting potential translational pathways. Mechanistic insights were gained into how polymer chain mobility, hydrophilicity/hydrophobicity balance, and hydrolyzable linkages govern degradation kinetics and drug diffusion. An integrated assessment framework was developed to guide future design of biodegradable, bio-based polymers for targeted release in oncology, chronic inflammatory diseases, and regenerative medicine. Overall, the work demonstrates that strategically engineered biodegradable polymers from renewable resources can achieve precise control over drug release profiles while maintaining biocompatibility and sustainable sustainability, offering a viable platform for next-generation pharmaceutical materials.

Project Overview

What This Project Is About

---

A straightforward exploration of creating and testing environmentally friendly plastics that break down safely in the body or environment while carrying medicines in a controlled way. It covers how renewable materials can be turned into polymers (long chain molecules) and how their breakdown and drug-release behavior can be tuned.

---

---

The Problem It Addresses

---

Many plastics come from nonrenewable sources and persist for long times, causing pollution. There is a need for materials that are both safe to use for drug delivery and degrade after their job is done. This project looks at sustainable polymers that can control how fast a drug is released.

---

---

Objectives of the Project

---

1. Learn how to make biodegradable polymers from renewable resources.
2. Characterize their physical and chemical properties.
3. Test how they release a model drug over time.
4. Assess safety and degradation behavior under simple conditions.
5. Compare performance with a conventional, non-renewable polymer.

---

---

What You Will Do Step by Step

---

1) Select renewable starting materials and plan synthesis. 2) Prepare polymers in small batches. 3) Characterize using basic tools to measure size, structure, and degradation. 4) Load a test drug and study release over time. 5) Analyze data to see how composition affects release. 6) Compare with a standard polymer. 7) Discuss environmental and practical implications.

---

---

---

---

Expected Outcome

A clear set of biodegradable polymers from renewable materials that show tunable drug release and safe degradation, along with basic data comparing performance to conventional polymers. This could guide design choices for eco-friendly, patient-friendly medical materials.