title: [Study of purity tests for silicone resins].
abstract: In the 8th edition of Japan's Specifications and Standards for Food Additives, the purity test for silicone resins requires the determination of the refractive index and kinetic viscosity of the extracted silicone oil, and allows for only a limited amount of silicon dioxide. In the purity test, carbon tetrachloride is used to separate the silicone oil and silicon dioxide. To exclude carbon tetrachloride, methods were developed for separating the silicone oil and silicon dioxide from silicone resin, which use hexane and 10% n-dodecylbenzenesulfonic acid in hexane. For silicone oil, the measured refractive index and kinetic viscosity of the silicone oil obtained from the hexane extract were shown to be equivalent to those of the intact silicone oil. In regard to silicon dioxide, it was confirmed that, following the separation with 10% n-dodecylbenzenesulfonic acid in hexane, the level of silicon dioxide in silicone resin can be accurately determined. Therefore, in this study, we developed a method for testing the purity of silicone resins without the use of carbon tetrachloride, which is a harmful reagent.
authors.affiliation: Division of Food Additives, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan. ksato@nihs.go.jp
authors.forename: Kyoko
authors.initials: K
authors.lastname: Sato
authors.forename: Noriko
authors.initials: N
authors.lastname: Otsuki
authors.forename: Akio
authors.initials: A
authors.lastname: Ohori
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Chinda
authors.forename: Noriko
authors.initials: N
authors.lastname: Furusho
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Osako
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Akiyama
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kawamura
mesh_terms: D002251:Carbon Tetrachloride / Q000009:adverse effects; D005503:Food Additives / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D012031:Refractometry; D012822:Silicon Dioxide / Q000302:isolation & purification; D012827:Silicone Oils / Q000302:isolation & purification; D012828:Silicones / Q000737:chemistry*; D012997:Solvents; D014783:Viscosity
chemical_list: D005503:Food Additives; D012827:Silicone Oils; D012828:Silicones; D012997:Solvents; D012822:Silicon Dioxide; D002251:Carbon Tetrachloride