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Additional info for Amino Acids, Peptides and Proteins: An Introduction
The separation of the mixture of amino acids obtained by hydrolysis is usually achieved by chromatographic procedures35• Separation into the individual components usually starts with a group separation into acidic, basic and neutral amino acids. In this process electrophoresis and specific anion and cation exchange resins play an important role. Selective isolation of aromatic amino acids is possible by adsorption onto activated charcoal. Glutamic acid can be directly crystallised from a concentrated hydrolysate which has been saturated with hydrogen chloride.
J ~ E C) g I 0 Time 15 20 25 Jamin Figure 12. 2. Mass Spectral Analysis of Arnino Acids62 Improved instrumentation has enabled mass spectroscopy to become increasingly valuable in amino acid and peptide chemistry in recent years. 49 Analysis of Amino Acids The detection and identification of fragments generated by the decay of the molecular ion formed in the electron beam is of prime interest. e~ I / H2N-~-COOH ~ lm/e=M-451 COOH jmle= 451 61 [H2N=CH-COOH + R• -- jmle=741 lm/e =M-741 Other fragmentations are possible, depending on the structure of the side chain.
E~ I / H2N-~-COOH ~ lm/e=M-451 COOH jmle= 451 61 [H2N=CH-COOH + R• -- jmle=741 lm/e =M-741 Other fragmentations are possible, depending on the structure of the side chain. In Figure 13 the mass spectrum of threonine, measured at 70 eV, ;;;hows in addition to the normal fragments (mje 74 and 75) two further peaks of high relative intensity, which may be explained by the following fragmentation: mle = 75 mle 57 + CH3-CHO I mle=~ I mle 18 Because of the low volatility of amino acids, it is necessary to introduce samples into the mass spectrometer at 10-6-10- 7 Torr and 100-150°C.