Polymeric Microspheres
Designed for Sustained, Long-Acting Therapeutic Performance
Polymeric microspheres enable true sustained-release drug delivery, reducing dosing frequency while improving stability, pharmacokinetics, and patient adherence. At Phosphorex, we engineer biodegradable microsphere systems using polymers such as PLGA, PLA, and PCL to encapsulate small molecules, peptides, and proteins with precise control over loading and release kinetics. By integrating formulation science, scalable process development, and CMC strategy, we translate complex microsphere platforms into reproducible, clinically viable long-acting therapies.
Charting Your Path to Optimized Polymeric Microsphere Formulations
Our microsphere formulation screening and optimization services offer a structured approach to systematically evaluating payload-polymeric microsphere combinations and refining composition and process parameters to identify and optimize clinically viable, high-performing formulations.
Understand Formulation Objectives
Our team collaborates with your team to solidify the objectives for the polymeric microsphere formulation and your Target Product Profile (TPP).
Evaluate Drug Delivery Formulation Candidates
We use a single cargo for iterative formulation and process screening, allowing us to down-select lead PMP prototype formulations that exhibit low burst and a targeted sustained release profile.
Explore Payload Candidates
Explore multiple API-excipient combinations to screen and optimize the drug substance candidate using a prototype PMP formulation.
Formulation Optimization
Formulation optimization systematically refines the polymeric microsphere composition, materials, and process parameters to achieve desired stability, release kinetics, efficacy, manufacturability, and control of critical quality attributes for clinical translation.
Understand Formulation Objectives
Our team collaborates with your team to solidify the objectives for the polymeric microsphere formulation and your Target Product Profile (TPP).
Evaluate Drug Delivery Formulation Candidates
We use a single cargo for iterative formulation and process screening, allowing us to down-select lead PMP prototype formulations that exhibit low burst and a targeted sustained release profile.
Explore Payload Candidates
Explore multiple API-excipient combinations to screen and optimize the drug substance candidate using a prototype PMP formulation.
Formulation Optimization
Formulation optimization systematically refines the polymeric microsphere composition, materials, and process parameters to achieve desired stability, release kinetics, efficacy, manufacturability, and control of critical quality attributes for clinical translation.
Understand Formulation Objectives
Our team collaborates with your team to solidify the objectives for the polymeric microsphere formulation and your Target Product Profile (TPP).
Evaluate Drug Delivery Formulation Candidates
We use a single cargo for iterative formulation and process screening, allowing us to down-select lead PMP prototype formulations that exhibit low burst and a targeted sustained release profile.
Explore Payload Candidates
Explore multiple API-excipient combinations to screen and optimize the drug substance candidate using a prototype PMP formulation.
Formulation Optimization
Formulation optimization systematically refines the polymeric microsphere composition, materials, and process parameters to achieve desired stability, release kinetics, efficacy, manufacturability, and control of critical quality attributes for clinical translation.
The Phosphorex Drug Delivery Engine for Polymeric Microspheres
Translating therapeutics utilizing polymeric microspheres from early biological promise to clinical reality requires coordinated formulation refinement, scalable process design, CMC alignment, analytical depth, and structured tech transfer. The Phosphorex Drug Delivery Engine integrates these disciplines to convert polymeric microspheres into reproducible, manufacturing-ready therapies positioned for regulatory and clinical success.
Formulation Optimization
Our formulation optimization services define the precise composition, materials, and process parameters needed to deliver stable, efficacious, and manufacturable polymeric microspheres.
Process Design & CMC
Analytical Expertise
Tech Transfer, Process Optimization & Troubleshooting
Why Phosphorex for Polymeric Microspheres?
20+ Years of Drug
Delivery Leadership
Two decades of microsphere development experience translating complex therapeutics into clinically viable products.
Advanced Polymer
Chemistry Insight
Expertise in poly(lactic-co-glycolic acid) (PLGA), polylactic acid (PLA), polycaprolactone (PCL), polyethylene glycol (PEG)-modified polymers, poly(beta-amino esters) (PBAEs), and novel cationic polymer systems for nucleic acid delivery.
Integrated Formulation,
Process & CMC Strategy
We design polymeric microspheres with scalability, CQAs, and regulatory readiness built in from the outset.
Early Manufacturability
Risk Identification
We proactively identify scalability and filterability risks before lead nomination, preventing costly redevelopment later.
Flexible,
Program-Driven Support
Agile iteration, rapid realignment, and seamless progression from formulation screening through IND-enabling scale-up and clinical manufacturing.
Collaborative Approach
White-glove collaboration and transparent communication, allowing us to function as a seamless extension of your team.
20+ Years of Drug
Delivery Leadership
Early Manufacturability
Risk Identification
Advanced Polymer
Chemistry Insight
Flexible,
Program-Driven Support
Integrated Formulation,
Process & CMC Strategy
Collaborative Approach
THE PHOSPHOREX DRUG DELIVERY ENGINE IN PRACTICE
Sterile Growth Factor Microspheres Enabled Cancer Vaccine Implant
Problem
A physician-sponsored clinical trial required a precisely dosed, sterile growth factor delivery system for incorporation into an implantable cancer vaccine scaffold. The challenge was to accurately load nano-gram quantities of a sensitive growth factor into biodegradable microspheres while meeting stringent sterility, bioburden, and endotoxin requirements for human use.
Solution
Phosphorex designed a PLGA microsphere formulation capable of reliably encapsulating nano-gram levels of the growth factor. An aseptic manufacturing process was developed to ensure sterility with low bioburden and endotoxin levels. We produced and released sterile microspheres under GLP conditions, supporting clinical use.
Outcome
The microspheres were successfully incorporated into cancer vaccine scaffolds at the clinical site and implanted in late-stage melanoma patients, enabling the execution of the physician-sponsored clinical trial.
Polymeric Microspheres FAQs
Updates & Expertise
Ready to Engineer Particles for Precision Drug Delivery?
Partner with Phosphorex to transform your therapeutic vision into a precisely designed, clinically viable drug delivery solution.