S-protected thiolated cyclodextrins as mucoadhesive oligomers for drug delivery.
J Colloid Interface Sci
; 531: 261-268, 2018 Dec 01.
Article
in En
| MEDLINE
| ID: mdl-30036850
ABSTRACT
AIM:
The purpose of this study was to develop a novel mucoadhesive thiolated and S-protected gamma cyclodextrin (γ-CD) with an intact ring backbone to assure a prolonged residence time at specific target sites.METHOD:
Thiolated γ-CD was generated through bromine substitution of its hydroxyl groups followed by replacement to thiol groups using thiourea. In the second step, thiol groups were protected by disulfide bond formation with 2-mercaptonicotinic acid (2-MNA).RESULT:
Thiolated γ-CD displayed 1385⯱â¯84⯵mol thiol groups per gram of oligomer and the amount of MNA determined in the S-protected oligomer was 1153⯱â¯41⯵mol per gram of oligomer. In-vitro screening of mucoadhesive properties of thiolated and S-protected γ-CD was done by two methods. Rheological investigation revealed the conjugates non-mucolytic with only a slight increase in viscosity of thiolated and S-protected γ-CD as compared to unmodified γ-CD, whereas mucoadhesive properties of the new thiolated and S-protected γ-CD performed on freshly excised porcine intestinal mucosa showed 44.4- and 50.9-fold improvement in mucoadhesion, respectively. The new conjugates did not show any cytotoxicity to Caco-2 cells even at a concentration of 1% (m/v) for 24â¯h. In addition, in-vitro studies of α-amylase degradation of γ-CD, γ-CD-SH and γ-CD-SS-MNA confirmed that all conjugates are biodegradable.CONCLUSION:
These outcomes predict that these new conjugates of γ-CD might provide a new favorable tool for drug delivery providing a prolonged residence time on mucosal surfaces.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sulfhydryl Compounds
/
Drug Carriers
/
Drug Delivery Systems
/
Gamma-Cyclodextrins
/
Intestinal Mucosa
Type of study:
Prognostic_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
J Colloid Interface Sci
Year:
2018
Document type:
Article
Affiliation country: