Using a water-glycerol matrix in secondary-ion mass spectrometry for determining organic compoundsстатья
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Аннотация:A method of secondary-emission mass-spectrometric analysis of nonvolatile organic compounds with the use of a mixed water-glycerol matrix is proposed. A drop of matrix solution containing an admixture of the test material is cooled to the temperature of liquid nitrogen and used as the target. It is shown that the yield of protonated molecular ions from amino acids is maximum for a matrix containing 80% water and 20% glycerol. The yield of quasimolecular ions increases on adding 1% nitric acid. Using a water-glycerol matrix increases the yields of protonated molecular ions from various amino acids (DL-threonine, DL-arginine, L-phenylalanine, and glycylglycine) by 10-20 times compared to those attained with a pure glycerol matrix.