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By H.D. Jakubke, J. Jeschkeit

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Their investigations showed that the chemical shifts and also the proton-proton coupling constants depend on the charge status of the amino acid. The relationship --cm-1 t 5000 3000 2500 2000 7500 1400 7300 7200 7100 1000900850 BOO 750 700 L,,,100 1- t1-IU 90 II II' v § ~ E: ::? al 11 rl-. 3 7 5 9 10 7300 17 12 73 " 6 ,... J ~Ill" 01111 II' 7 8 b) 14. - v 72 13 14. A- Figure 6. IR spectra of L-alanine (a) and L-alanine hydrochloride (b) 28 Amino Acids between chemical shift and acidity looks like a typical titration curve.

Eluant I: CHC1 3/Me0Hj17%NH4 0H solution (2: 1: 1); 75 min. Eluant II: PhOH/H2 0 (3: 1); 180 min 46 Amino Acids lysate of an insulin B-chain on silica gel G. 3. 5 mg of a beef serum albumin hydrolysate by partition chromatography on a starch column. The eluate was T Figure 10. Scheme of the first automatic amino acid analyser of SPACKlliAN, MooRE and STEIN divided, using a fraction collector, into about 400 portions. The amino acid content of each fraction was determined manually by the ninhydrin reaction and the molar proportions of each amino acid were calculated from the integrated curve of intensity versus fraction number.

Synthetic Processes 1- 3 Of the great number of methods available, only a few will be discussed in detail here. These include the aminolysis of halogenated carboxylic acids, the STRECKER synthesis, the azlactone and the hydantoin syntheses and the malonic ester synthesis. Later sections describe methods which can be used for the synthesis of isotopically labelled amino acids and some of the reactions which have been proposed to account for amino acid formation in the course of the development of life on the earth.

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