Reference XPS spectra of amino acids

Proton magnetic resonance spectra of amino acids.

High resolution nuclear magnetic resonance spectroscopy has already proved its ability to yield valuable information on the structure, reactivity and exchange rate of a variety of compounds. Although its application to substances in aqueous solution has often been limited by solubility and exchange, it has been possible to detect the spectra of several amino acids and dipeptides in water (I). T...

Soft X-ray-induced decomposition of amino acids: an XPS, mass spectrometry, and NEXAFS study.

Decomposition of five amino acids, alanine, serine, cysteine, aspartic acid, and asparagine, under irradiation with soft X rays (magnesium Kalpha X-ray source) in ultra-high vacuum was studied by means of X-ray photoelectron spectrometry (XPS) and mass spectrometry. A comparative analysis of changes in XPS line shapes, stoichiometry and residual gas composition indicates that the molecules deco...

Performance of 2-Amino Tetraphenyl Porphyrin as Stationary Phase in RP-HPLC of Amino Acids

The search for new stationary phases has been one of the predominant concerns in high performance liquid chromatography (HPLC) in order to achieve better resolutions, longer column lives, and reduce the time of analysis. A chromatographic packing for separation of underivatized amino acids (AAs) were prepared by dynamically coating 2-amino tetraphenyl prophyrin (atpp) on a C-18 reversed-pha...

Influence of vegetable amino acids and oils supplementation of on Chlorella vulgaris amino acid profile

The aim of the present research is to investigate the profile of amino acid of Chlorella vulgaris supplemented with some plant amino acid and oil extracts. The bioactive oil and amino acid from four Iranian medicinal plants, namely Oliveria decumbens, Thymus kotschyanus, Trachyspermum ammi, and Zataria multiflora were obtained. The LC-MS / MS analysis demonstrated that the major amino acids com...

Isotopic Effects in Xps Spectra of H2o and D2o