Publication detail

Hydrolytic stability of end-linked hydrogels from PLGA-PEG-PLGA macromonomers terminated by alpha,omega-itaconyl groups

MICHLOVSKÁ, L. VOJTOVÁ, L. HUMPA, O. KUČERÍK, J. ŽÍDEK, J. JANČÁŘ, J.

Original Title

Hydrolytic stability of end-linked hydrogels from PLGA-PEG-PLGA macromonomers terminated by alpha,omega-itaconyl groups

Type

journal article in Web of Science

Language

English

Original Abstract

Biodegradable amphiphilic PLGA-PEG-PLGA triblock copolymers end-terminated with itaconic acid (ITA) having reactive double bonds were synthesized by ring opening polymerization. The prepared alpha,omega-itaconyl-PLGA- PEG-PLGA telechelic macromonomers were additionally covalently crosslinked under an inert atmosphere by blue light irradiation without the use of a further cross-linker resulting in end-linked polymeric networks. The effects of the ITA amount attached to the alpha,omega-itaconyl-PLGA-PEG-PLGA copolymers and the crosslinking time on swelling behaviours and hydrolytic stability of the prepared well-defined polymeric network were investigated. Physicochemical properties were characterized by proton and carbon nuclear magnetic resonance spectroscopy (H-1 NMR, C-13 NMR), proton nuclear magnetic resonance relaxometry, attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR) and thermogravimetric analysis (TGA). It was found that the hydrolytic stability of ITA modified PLGA-PEG-PLGA end-linked hydrogels enhances with both increasing the time of crosslinking and the amount of double bonds attached to alpha,omega-itaconyl-PLGA-PEG-PLGA polymer chains. In comparison with the original un-crosslinked alpha,omega-itaconyl-PLGA-PEG-PLGA copolymer, the hydrolytic stability of the end-linked hydrogels significantly increased. Three kinds of water fractions (unbound, weakly and strongly bonded) were determined by proton NMR relaxometry in hydrogels containing 63 mol% of ITA crosslinked for 40 minutes. Even for hydrogels surviving 32 days in water the NMR relaxometry showed structural collapse of the hydrogel probably due to breaking of end-linked nodes followed by hydrolysis faster than water diffusion after day 15 of immersion. End-linked alpha,omega-itaconyl-PLGA- PEG-PLGA hydrogels can be used in medical, biological or tissue engineering applications.

Keywords

biodegradable copolymer, itaconic anhydrid, chemical crosslinking, hydrolytic stability

Authors

MICHLOVSKÁ, L.; VOJTOVÁ, L.; HUMPA, O.; KUČERÍK, J.; ŽÍDEK, J.; JANČÁŘ, J.

Released

4. 2. 2016

ISBN

2046-2069

Periodical

RSC Advances

Year of study

6

Number

20

State

United Kingdom of Great Britain and Northern Ireland

Pages from

16808

Pages to

16816

Pages count

9

URL

https://pubs.rsc.org/en/content/articlehtml/2016/ra/c5ra26222d

BibTex

@article{BUT123101,
  author="Lenka {Michlovská} and Lucy {Vojtová} and Otakar {Humpa} and Jiří {Kučerík} and Jan {Žídek} and Josef {Jančář}",
  title="Hydrolytic stability of end-linked hydrogels from PLGA-PEG-PLGA macromonomers terminated by alpha,omega-itaconyl groups",
  journal="RSC Advances",
  year="2016",
  volume="6",
  number="20",
  pages="16808--16816",
  doi="10.1039/c5ra26222d",
  issn="2046-2069",
  url="https://pubs.rsc.org/en/content/articlehtml/2016/ra/c5ra26222d"
}