Purification of vitellogenin from the plasma of Indian freshwater murrel, <i>Channa punctatus </i>(Bloch) by different methods: A comparative study

Abstract

Plasma from estrogenized, [³²p] NaH₂P0₄ -injected murrel, <i>Channa Punctatus </i>was collected in the presence of proteolytic inhibitors and subjected to different separation procedures singly or in combination, viz., gel filtration chromatography on Ultrogel AcA 34, ion-exchange chromatography on DEAE sephacel, or selective precipitation with dimethylformamide or with Mg²⁺: EDTA in order to isolate vitellogenin from other plasma proteins. The results show that chromatography on Ultrogel or DEAE sephacel yields intact vitellogenin whereas prior precipitation with DMF or with

Mg²⁺: EDT A results in either co-precipitation of other plasma proteins or in the cleavage of phosvitin-like material from the native vitellogenin molecule.