The powder released reacted with sodium persulphate, an oxidising agent, which was stored adjacent to it.
2.
In physically entrapping gels, the protein has to be added when the gel is crosslinked, so the conditions used must not damage the protein, excluding the hydrogel, which requires non-aqueous solvents or harsh chemicals, an example being TEMED-persulphate-catalysed ( peroxide radical initiation ) acrylamide or acrylate, which is used for SDS PAGE but for not protein encapsulation.
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