title: Colon-specific delivery of resveratrol: optimization of multi-particulate calcium-pectinate carrier.
abstract: This study aimed at devising multi-particulate calcium-pectinate (Ca-pectinate) bead formulations for colon-targeted delivery of resveratrol. As Ca-pectinate beads were not sufficient to endure the upper GI environment and premature release of resveratrol occurred before their arrival to the colon, the beads were hardened by adding polyethyleneimine (PEI) in the cross-linking solution. The effects of PEI concentration, cross-linking time, and pectin to resveratrol ratio were investigated on beads' characteristics, encapsulation efficiency, swelling-erosion, and resveratrol retention pattern of formulated beads. Proper conditions were optimized from these studies and optimized beads were further subjected to morphological examination. Formulated beads were spherical with approximately 1 mm diameter. Addition of PEI to the cross-linking solution and a minimum cross-linking time were found to be crucial factors for colon-specific release of resveratrol. As PEI was added in the cross-linking solution, hardening of the bead surface occurred simultaneously with bead formation. Observations from the present study revealed that optimized Ca-pectinate beads hardened with PEI can efficiently encapsulate resveratrol and have potential for colon-specific delivery to the lower GI tract.
authors.affiliation: Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Republic of Singapore. surajitdas@nus.edu.sg
authors.forename: Surajit
authors.initials: S
authors.lastname: Das
authors.forename: Ka-Yun
authors.initials: KY
authors.lastname: Ng
mesh_terms: D002122:Calcium Chloride / Q000737:chemistry; D002626:Chemistry, Pharmaceutical; D003106:Colon / Q000378:metabolism*; D003432:Cross-Linking Reagents / Q000737:chemistry; D004337:Drug Carriers; D004339:Drug Compounding; D004355:Drug Stability; D005750:Gastric Juice / Q000737:chemistry; D006244:Hardness; D006863:Hydrogen-Ion Concentration; D007419:Intestinal Secretions / Q000737:chemistry; D007700:Kinetics; D010316:Particle Size; D010368:Pectins / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry; D000077185:Resveratrol; D012995:Solubility; D013267:Stilbenes / Q000008:administration & dosage / Q000737:chemistry* / Q000378:metabolism; D013499:Surface Properties; D013678:Technology, Pharmaceutical / Q000379:methods
chemical_list: D003432:Cross-Linking Reagents; D004337:Drug Carriers; D013267:Stilbenes; D010368:Pectins; D011094:Polyethyleneimine; D002122:Calcium Chloride; D000077185:Resveratrol