title: A study of single drug particle adhesion interactions using atomic force microscopy.
abstract: This paper aims to use Atomic Force Microscopy (AFM) to characterise the interaction forces between micronized salbutamol particles, an active ingredient frequently used in metered dose inhalers, and also to glass, lactose and a fluoropolymer. The methodology used involves challenging a salbutamol functionalized AFM tip to the surfaces of interest and measuring the force experienced by the cantilever as a function of tip-sample separation. Analysis of this force-distance data allows quantification of the particle-substrate adhesion. This study yields a ranking of adhesion as glass>lactose>salbutamol>polytetrafluoroethylene (PTFE). An increase in the interaction force between the salbutamol particle and PTFE on repeated contact due to tribocharging is also observed.
authors: Molecular Profiles Ltd., 1 Faraday Building, Nottingham Science and Technology Park, University Boulevard, Nottingham NG7 2QP, UK.
authors: J K
authors: JK
authors: Eve
authors: N
authors: N
authors: Patel
authors: S Y
authors: SY
authors: Luk
authors: S J
authors: SJ
authors: Ebbens
authors: C J
authors: CJ
authors: Roberts
mesh_terms: D000268:Adhesiveness; D000420:Albuterol / Q000008:administration & dosage / Q000737:chemistry; D005079:Excipients; D005898:Glass; D007091:Image Processing, Computer-Assisted; D007785:Lactose / Q000737:chemistry; D018625:Microscopy, Atomic Force; D010316:Particle Size; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D011138:Polytetrafluoroethylene; D011208:Powders; D013499:Surface Properties
chemical_list: D005079:Excipients; D004364:Pharmaceutical Preparations; D011208:Powders; D011138:Polytetrafluoroethylene; D007785:Lactose; D000420:Albuterol