Title :

In-situ forming plga implants for intraocular dexamethasone delivery

Author(s) :

Bode, C. [Auteur]
Centre Hospitalier Régional Universitaire [CHU Lille] [CHRU Lille]
Kranz, Heiko [Auteur]
Bayer Pharma AG [Berlin]
Siepmann, Florence [Auteur]
Médicaments et biomatériaux à libération contrôlée: mécanismes et optimisation - Advanced Drug Delivery Systems - U 1008 [MBLC - ADDS]
Advanced Drug Delivery Systems (ADDS) - U1008
Siepmann, Juergen [Auteur]
Médicaments et biomatériaux à libération contrôlée: mécanismes et optimisation - Advanced Drug Delivery Systems - U 1008 [MBLC - ADDS]
Advanced Drug Delivery Systems (ADDS) - U1008

Journal title :

International Journal of Pharmaceutics

Abbreviated title :

Int J Pharm

Volume number :

548

Pages :

337-348

Publication date :

2018-07-04

ISSN :

1873-3476

English keyword(s) :

PLGA
In-situ forming implant
Dexamethasone
Swelling
Autocatalysis

HAL domain(s) :

Sciences du Vivant [q-bio]

English abstract : [en]

Different types of in-situ forming implants based on poly(lactic-co-glycolic acid) (PLGA) and N-methyl-pyrrolidone (NMP) were prepared for controlled ocular delivery of dexamethasone. The impact of the volume of the release ...
Show more >Different types of in-situ forming implants based on poly(lactic-co-glycolic acid) (PLGA) and N-methyl-pyrrolidone (NMP) were prepared for controlled ocular delivery of dexamethasone. The impact of the volume of the release medium, initial drug content, polymer molecular weight and PLGA concentration on the resulting drug release kinetics were studied and explained based on a thorough physico-chemical characterization of the systems. This included for instance the monitoring of dynamic changes in the implants' wet and dry mass, morphology, PLGA polymer molecular weight, pH of the surrounding bulk fluid and water/NMP contents upon exposure to phosphate buffer pH 7.4. Importantly, the systems can be expected to be rather robust with respect to variations in the vitreous humor volumes encountered in vivo. Interestingly, limited drug solubility effects within the implants as well as in the surrounding aqueous medium play an important role for the control of drug release at a drug loading of only 7.5%. Furthermore, the polymer molecular weight and PLGA concentration in the liquid formulations are decisive for how the polymer precipitates during solvent exchange and for the swelling behavior of the systems. These features determine the resulting inner system structure and the conditions for mass transport. Consequently, they affect the degradation and drug release of the in-situ formed implants.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Advanced Drug Delivery Systems (ADDS) - U1008

Submission date :

2021-01-20T15:59:06Z
2024-02-20T07:42:12Z
2024-03-31T15:28:13Z
2024-04-02T13:25:09Z
2024-04-29T07:15:03Z