Cited by 367Advanced Drug Delivery SystemsHydrogels: synthesis, properties, applicationsNanoparticle-Based Drug Delivery

The DOI matches its Crossref record; 105 of the 112 references it cites were found in a registry or an index.

pH- and ion-sensitive polymers for drug delivery

Open access
Yoshida, Takayuki, Lai, Tsz Chung, Kwon, Glen S, Sako, Kazuhiro·2013·Expert Opinion on Drug Delivery

Abstract

INTRODUCTION: Drug delivery systems (DDSs) are important for effective, safe, and convenient administration of drugs. pH- and ion-responsive polymers have been widely employed in DDS for site-specific drug release due to their abilities to exploit specific pH- or ion-gradients in the human body. AREAS COVERED: Having pH-sensitivity, cationic polymers can mask the taste of drugs and release drugs in the stomach by responding to gastric low pH. Anionic polymers responsive to intestinal high pH are used for preventing gastric degradation of drug, colon drug delivery and achieving high bioavailability of weak basic drugs. Tumor-targeted DDSs have been developed based on polymers with imidazole groups or poly(β-amino ester) responsive to tumoral low pH. Polymers with pH-sensitive chemical linkages, such as hydrazone, acetal, ortho ester and vinyl ester, pH-sensitive cell-penetrating peptides and cationic polymers undergoing pH-dependent protonation have been studied to utilize the pH gradient along the endocytic pathway for intracellular drug delivery. As ion-sensitive polymers, ion-exchange resins are frequently used for taste-masking, counterion-responsive drug release and sustained drug release. Polymers responding to ions in the saliva and gastrointestinal fluids are also used for controlled drug release in oral drug formulations. EXPERT OPINION: Stimuli-responsive DDSs are important for achieving site-specific and controlled drug release; however, intraindividual, interindividual and intercellular variations of pH should be considered when designing DDSs or drug products. Combination of polymers and other components, and deeper understanding of human physiology are important for development of pH- and ion-sensitive polymeric DDS products for patients.

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Research works printed but not linked: 5

  1. Maeda H, 2013, Cancer Sci
  2. Lee JH, 2012, Int J Nanomedicine, 7, 1635
  3. Sharma M, 2011, Int J Nanomedicine, 6, 2097
  4. Matsumura Y, 1986, Cancer Res, 46, 6387
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Metadata

Authors
Yoshida, T., Lai, T. C., Kwon, G. S., & Sako, K.
Affiliations
  • Astellas Pharma (Japan) (JP)
  • University of Wisconsin–Madison (US)
Corresponding author
Yoshida, Takayuki
Venue
Expert Opinion on Drug Delivery
Published
2013-08-09
Volume
10
Issue
11
Pages
1497-1513
ISSN
  • 1742-5247 (ISSN-L)
  • 1744-7593
OpenAlex
W2003276331
Cited by
367
References
112
Citations by year
2026: 22 · 2025: 40 · 2024: 40 · 2023: 45 · 2022: 26 · 2021: 32 · 2020: 31 · 2019: 35 · 2018: 38 · 2017: 17 · 2016: 20 · 2015: 14 · 2014: 6
FWCI
1.68
Type
journal article
Language
en
Open access
Locations
  • Expert Opinion on Drug Delivery (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Allergy and Infectious Diseases (R01AI101157)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advanced Drug Delivery Systems
  • Physical Sciences › Materials Science › Biomaterials › Hydrogels: synthesis, properties, applications
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
Keywords
pH-responsive polymers, site-specific drug release, cationic polymers, taste masking, colon-targeted drug delivery, anticancer drug delivery, poly(β-amino ester), hydrazone linkage, cell-penetrating peptides, ion exchange resins, sustained drug release, oral drug formulation, gastric pH, intracellular drug delivery
MeSH terms
Biological Availability, Chemistry, Pharmaceutical, Delayed-Action Preparations, Pharmaceutical Preparations, Humans, Hydrogen-Ion Concentration, Ions, Polymers, Drug Delivery Systems, Cell-Penetrating Peptides

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