| 摘要 |
<p>Monitoring method which finds particular (but not exclusive) application in solid phase peptide synthesis. In one aspect, the synthesis starts with an amino acid residue protected by an N-alpha-amino protecting group and involves the steps: (a) removing the N-alpha-amino protecting group to obtain an N-alpha-amino group, (b) adding an amino acid residue protected by an N-alpha-amino protecting group, via a peptide bond, to the N-alpha-amino group obtained in step (a) by use of a reactive protected amino acid derivative and, where necessary, a catalyst, and (c) repeating steps (a) and (b) until the desired linear combination has been obtained; the reaction system includes 3-hydroxy-1,2,3-benzotriazin-4(3H)-one or a derivative thereof; and the colour of the reaction system or of a component thereof is monitored during the synthesis. The solvent is preferably a polar aprotic solvent, e.g. dimethylformamide. Where the synthesis is a solid phase synthesis, the solid phase is preferably a polyamide. Apparatus for carrying out these methods is also disclosed. In a preferred embodiment, this apparatus comprises (i) a column for receiving particles including a polyamide resin on which the solid phase synthesis is to take place; (ii) a light source disposed on one side of said column; (iii) a focussing arrangement disposed adjacent said column and opposite said light source; (iv) a photometer positioned to receive light focussed by said focussing arrangement; and (v) a microprocessor programmed to respond to the output of said photodetector and to control the synthesis procedure in response thereto.</p> |
