title: Chemical durability of Y2O3-Al2O3-SiO2 glasses for the in vivo delivery of beta radiation.
abstract: Microspheres made from Y2O3-Al2O3-SiO2 (YAS) glasses, which contain radioactive Y-90, are currently being used to treat liver cancer in humans, where their chemical durability is of prime importance. In deionized water or saline at 37 degrees C, the weight percent Yttrium (Y) dissolved from eight different YAS glasses ranged from only 0.02-0.13% of the total Y present and their dissolution rate was barely measurable, < or = 1.0 x 10(-9) g/cm2-min. The most chemically durable YAS glass was 17Y2O3-19Al2O3-64SiO2, mol%. The small amount of Y released from microspheres, 25-35 microns diameter, of this glass after corrosion in saline or deionized water at 37 degrees C was essentially the same as for bulk glass samples. Based on their excellent chemical durability, it is concluded that YAS glass microspheres are suitable for in vivo use.
authors.affiliation: Ceramic Engineering Department, University of Missouri-Rolla 65401.
authors.forename: E M
authors.initials: EM
authors.lastname: Erbe
authors.forename: D E
authors.initials: DE
authors.lastname: Day
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D000970:Antineoplastic Agents / Q000737:chemistry*; D001610:Beta Particles; D001672:Biocompatible Materials; D004337:Drug Carriers; D004355:Drug Stability; D005898:Glass; D006801:Humans; D007700:Kinetics; D008113:Liver Neoplasms / Q000532:radiotherapy; D008863:Microspheres; D010087:Oxides / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013054:Spectrophotometry, Atomic; D013997:Time Factors; D015021:Yttrium Radioisotopes / Q000008:administration & dosage* / Q000032:analysis / Q000737:chemistry / Q000627:therapeutic use
chemical_list: D000970:Antineoplastic Agents; D001672:Biocompatible Materials; D004337:Drug Carriers; D010087:Oxides; C084387:YAS glasses; D015021:Yttrium Radioisotopes; D012822:Silicon Dioxide; D000537:Aluminum Oxide