title: Preparation and properties of a pH sensitive carrier based on three kinds of polymer blend to control the release of 5-amino salicylic acid.
abstract: BACKGROUND
  High concentration of 5-amino salicylic acid (5-ASA) in the distal ileum and colon is necessary for the treatment of inflammatory bowel disease (IBD). The control of small molecules, drugs, released from a polymeric matrix remains a great challenge.
  
  
  OBJECTIVE
  To study the preparation and properties of a pH-sensitive carrier for targeting delivery of 5-ASA.
  
  
  METHODS
  The carrier was prepared by ternary blends method based on polyvinyl alcohol (PVA), sodium alginate (SA) and polylactic acid. It was characterized by infrared spectrometry and scanning electronic microscopy. The adsorption and release of 5-ASA in different pH media were investigated.
  
  
  RESULTS
  We found out the best ratio of the materials for synthetic carrier. The vector exhibited good performance by the controlled release of the target drug experiment. The adsorption capacity of the carrier for 5-ASA was 70.34% in phosphate buffer saline at pH 1.00, and the release rate was 100.49% in phosphate buffer solution at pH 6.80.
  
  
  CONCLUSIONS
  PVA is vector backbone of the carrier, and SA plays key role in its pH performance. It is a promising material to effectively deliver 5-ASA to the specific sites of IBD.
authors: Jiangsu Provincial Key Laboratory for Interventional Medical Devices, Huaiyin Institute of Technology , Huaian, Jiangsu Province , P.R. China .
authors: Yuming
authors: Y
authors: Dong
authors: Zhengjie
authors: Z
authors: Zhou
authors: Hongyan
authors: H
authors: Ding
authors: Shujiang
authors: S
authors: Zhang
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage*; D003692:Delayed-Action Preparations / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000737:chemistry*; D019804:Mesalamine / Q000008:administration & dosage*; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry*
chemical_list: D000464:Alginates; D000894:Anti-Inflammatory Agents, Non-Steroidal; D003692:Delayed-Action Preparations; D006603:Hexuronic Acids; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide); D019804:Mesalamine; D020723:Glucuronic Acid; D011142:Polyvinyl Alcohol