Amino Acids, Peptides and Proteins (SPR Amino Acids, by J. S. Davies

By J. S. Davies

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Extra resources for Amino Acids, Peptides and Proteins (SPR Amino Acids, Peptides, and Proteins (RSC)) (Vol 2)

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C. ) The Edman degradation and its high-sensitivity version, the dansyl-Edman procedure, account for a large proportion of the amino-acid sequences established last year. Commercial versions of the automatic ‘sequenator’ are now on the market-a doubtful mark of respectability, perhaps-and encouraging reports of sequences established with the original machine continue to come from Edman’s laboratory. Some improvements to the machine in the way of reagent systems have been briefly reported 8 2 and it is worth recalling that the more volatile methyl isothiocyanate could perhaps be substituted to a d ~ a n t a g e66.

A. Collins, and R. A. Grant, Photochem. , 1969, 10, 141. lRK Amino-acids 23 A. lg5 Several applications of computer analysis for data handling have been r e p ~ r t e d . "O A new method of separation of hydantoins on an anion-exchange resin appears effective,201and separat ions of water-soluble dinitrophenylamino-acids 202 and selenium-containing amino-acids 203 have also been reported. B. c. c. c. 21* C. c. 215It has been J. Harmeyer, H. P. Sallmann, and L. Ayoub, J. , 1968, 32, 258. H. H. , 1968, 14, 967.

Ovchinnikov and M. M. Shemyakin, Experrentia, 1969. 25. 913. 34 Amino-acids, Peptides, and Proteins I t is ericouraging to see that more conventional peptides are now having their sequences successfully analysed by mass spectrometry. g* In the latter case, 10 residues of an 18-residue peptide were placed in sequence, which exemplifies how rapidly techniques for rendering large peptides sufficiently volatile for analysis are advancing. This is due in large part to permethylation of the peptide, and a new technique for permethylation with methyl iodide and sodium hydride in dimethylformamide 99 would seem most valuable.

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