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hbcz_chx

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duotaihech

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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.
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