Please use this identifier to cite or link to this item:
Title: Tuning drug release in polyester thin films : terminal end-groups determine specific rates of additive-free controlled drug release
Authors: Steele, Terry W. J.
Huang, Charlotte Liwen
Kumar, Saranya
Iskandar, Aneesa
Baoxin, Aw
Boey, Freddy Yin Chiang
Loo, Say Chye Joachim
Venkatraman, Subbu S.
Issue Date: 2013
Source: Steele, T. W. J., Huang, C. L., Kumar, S., Iskandar, A., Baoxin, A., Boey, F. Y. C., Loo, S. C. J., & Venkatraman, S. S. (2013). Tuning drug release in polyester thin films: terminal end-groups determine specific rates of additive-free controlled drug release. NPG Asia materials, 5(4), e46-.
Series/Report no.: NPG Asia materials
Abstract: Modulating the drug release from polyester matrices independently of material properties would be beneficial to those designing biodegradable medical implants, such as drug delivery devices, stents and screws. However, the most common approaches use additives that often drastically alter the desired material properties. Recently, we have developed tools that allow gradient film formulations and high-throughput drug quantitation for the determination of parameter-specific correlations. We propose that modulated drug release can be obtained via additive-free mechanisms in polyesters by simply controlling polymer erosion through acidic terminal functional groups. Our results showed that drug release in poly(lactic-co-glycolic acid) (PLGA) formulations could be tuned to produce large ranges in drug release with relatively small changes in terminal acidic functional groups. For example, PLGA 53/47 thin films could be tuned to have 10–60% drug release at 14 days or 10–90% drug release at 20 days, depending on the PLGA/PLGA blend formulation and concentration of acidic terminal functional groups. A linear R-square correlation of up to 0.9 was observed for the acidic groups and percent drug release. Below a threshold of 1 part per thousand acidic groups, there was no increase in drug release, which has implications for polymer processing and film integrity.
ISSN: 1884-4057
DOI: 10.1038/am.2013.9
Rights: © 2013 Nature Japan K.K. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles


Updated on Jun 18, 2020

Citations 10

Updated on Mar 4, 2021

Page view(s) 20

Updated on Mar 4, 2021

Download(s) 10

Updated on Mar 4, 2021

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.