For each pair of amino acids, determine which will be eluted first from the ion-exchange column using a pH 7.0 buffer.
确定下列每对氨基酸在pH7.0的缓冲液中，哪个先从离子交换柱上洗脱下来。
The amino acids on amphoteric ion exchange fiber are easy to be eluted and a small amount of elution reagent is therefor needed.
两性离子交换纤维还具有洗脱容易，洗脱液用量少的特点。
The column core can then be pushed out and the zones of material cut apart, or the zones can be eluted by passing more solvent down the column and collecting it in small fractions.
然后将此柱的芯子推出，将各段物料分开，或者用更多溶剂通过此柱以洗提各区段，然后收集各小组分的物料。
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