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A. Kaiser test Reagents • 5% Ninhydrin in ethanol (w/v) • KCN in pyridine (2 ml 0.001 M KCN in 98 ml • 80% Phenol in ethanol (w/v) pyridine) Method 1. Sample a few resin beads and wash several times with ethanol. 2. Transfer to a small glass tube and add 2 drops of each of the solutions above. 3. Mix well and heat to 120¡ãC for 4-6 min. 4. The presence of resin-bound free amine is indicated by blue resin beads. ²»¹ýÏÖÔÚÒ»°ã¶¼²»ÓÃÇ軯¼ØÁË£¬ÓÃÖØÕôßÁऴúÌæ¡£ |
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