title: H/D kinetic isotope effect as a tool to elucidate the reaction mechanism of methyl radicals with glycine in aqueous solutions.
abstract: The H/D kinetic isotope effect (KIE) for the reaction of methyl radicals with glycine in aqueous solutions at pH 10.6 equals 16 ± 3. This result proves that the methyl radical abstracts a hydrogen atom from the methylene group of glycine and not an electron from the unpaired couple on the nitrogen atom. The rate constant of the reaction of methyl radicals with glycine at pH 7.0 is orders of magnitude smaller than that at pH 10.6.
authors: Chemistry Department, Nuclear Research Centre Negev , Beer-Sheva, 86000, Israel.
authors: Guy
authors: G
authors: Yardeni
authors: Israel
authors: I
authors: Zilbermann
authors: Eric
authors: E
authors: Maimon
authors: Lioubov
authors: L
authors: Kats
authors: Ronen
authors: R
authors: Bar-Ziv
authors: Dan
authors: D
authors: Meyerstein
mesh_terms: D041961:Deuterium Exchange Measurement; D004583:Electrons; D005998:Glycine / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D011522:Protons; D014867:Water / Q000737:chemistry*
chemical_list: D011522:Protons; D014867:Water; C051224:methyl radical; D008697:Methane; D005998:Glycine