Polymer-Based Drug Delivery Systems and Analysis

Polymer‐based drug delivery systems encompass a broad array of engineered materials designed to transport therapeutic agents in a controlled manner. By selection of polymer chemistry, molecular weight and architecture, carriers such as nanoparticles, micelles, hydrogels and dendrimers can be tailored to achieve sustained release, targeted accumulation and minimised off-target effects. Critical parameters include polymer–drug interactions, responsiveness to physiological stimuli (pH, temperature, enzymes) and surface characteristics that govern circulation time and cellular uptake. Advances in analytical techniques—from chromatography and spectroscopy to imaging and mass spectrometry—permit detailed assessment of drug loading, release kinetics and biodistribution. Together, these developments underpin the translation of polymeric platforms into applications ranging from oncology and immunotherapy to regenerative medicine and infectious disease, offering improved therapeutic indices and personalised treatment strategies.

Research from Nature Portfolio

Recent studies have demonstrated how biomimetic surface design can enhance carrier performance. Nanoscale topographical features inspired by natural interfaces have been shown to direct cell–material interactions, promoting bioadhesion, barrier modulation and subcellular trafficking of polymeric nanoparticles. These insights enable fabrication of surfaces that regulate drug uptake and minimise immune clearance. In parallel, next-generation poly(lactic-co-glycolic acid) nanocrystals have been engineered as colloidal carriers for poorly soluble drugs. By optimising formulation parameters and stabiliser composition, these systems exhibit improved solubility, sustained and biphasic release profiles, and enhanced bioavailability in preclinical disease models. Both lines of work illustrate the power of precise polymer design in achieving bespoke delivery and therapeutic efficacy.

Research from all publishers

A versatile method for quantifying polyethylene glycol (PEG) markers via LC–MS/MS has emerged, employing sample hydrolysis to liberate characteristic fragments. This approach offers a generic tool for tracking the biodistribution of diverse PEGylated therapeutics and nanoparticles in biological matrices, yielding insights into in vivo stability and release dynamics. In another advance, cholesterol end-capped amphiphilic polymers have been synthesised to self-assemble into micelles with tunable core–shell architectures. By varying the hydrophobic‐to‐hydrophilic balance, these micelles achieve high drug-loading efficiencies and controlled release under physiological and competitive binding conditions. Furthermore, pH-responsive three-armed block copolymers incorporating a cholic acid core form stable micellar reservoirs at neutral pH but undergo rapid disassembly in acidic environments, enabling triggered release of encapsulated agents. Collectively, these studies highlight the synergy between polymer architecture and stimuli-responsive behaviour in modern drug delivery.

Polymer-Based Drug Delivery Systems and Analysis publication trend

The graph below shows the total number of articles in polymer-based drug delivery systems and analysis across all publications each year (not limited to Nature Index journals).

Technical terms

Nanotopography: The arrangement of surface features at the nanometre scale that influences cell adhesion and biological interactions.

PEGylation: The covalent attachment of polyethylene glycol chains to molecules or particles to improve solubility, stability and circulation half-life.

Block copolymer: A polymer consisting of two or more chemically distinct segments that can self-assemble into well‐defined nanostructures.

Micelle: A nanoscale aggregate formed by amphiphilic polymers in aqueous media, featuring a hydrophobic core for drug encapsulation and a hydrophilic shell for solubility.

Biodistribution: The study of how a substance is distributed and localised within biological tissues and organs after administration.

References

1. Bioinspired nanotopographical design of drug delivery systems. Nature Reviews Bioengineering (2023).
2. Polyethylene glycol (PEG) as a broad applicability marker for LC–MS/MS-based biodistribution analysis of nanomedicines. Journal of Controlled Release (2024).
3. Self-assembly of cholesterol end-capped polymer micelles for controlled drug delivery. Journal of Nanobiotechnology (2020).
4. pH-Responsive Micelles Assembled by Three-Armed Degradable Block Copolymers with a Cholic Acid Core for Drug Controlled-Release. Polymers (2019).
5. Fabrication of Second Generation Smarter PLGA Based Nanocrystal Carriers for Improvement of Drug Delivery and Therapeutic Efficacy of Gliclazide in Type-2 Diabetes Rat Model. Scientific Reports (2019).