1. Some extracts were partially purified with a column of silicic acid using acetone as the eluant.

2. Illustrative of its chelating abilities, citric acid was the first successful eluant used for total ion-exchange separation of the lanthanides, during the Manhattan Project in the 1940s.

3. The method includes passing the mixture containing the hybrid compound over a column having attached thereto molecules consisting of or containing a complex sugar moiety with affinity for the hybrid compound, and eluting the hybrid compound with a suitable eluant.