The semisynthesis of portions of hen's-egg lysozyme by fragment condensation

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Abstract
1. We have evaluated several methods for coupling protected tryptic peptides and have selected one that is satisfactory in terms of efficiency and degree of racemization. 2. We report the use of the chosen method (which must be slightly modified for each application in the light of the result of micro-scale pilot experiments) for the preparation of five fragments of hen's-egg lysozyme ranging in length from 31 to 51 residues. 3. We report methods for the complete deprotection of these fragments. They have been characterized by end-group determination, amino acid analysis and tryptic digestion.