Quote:
Originally Posted by avendesora 
Antioxidants A, E, and C are all preservatives.
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But they have very little action against the growth of microbes, which is what people usually want preservation against. Antioxidants are fine against rancidity caused by non-biologic oxidation, but that's not the way something like soapwort solution is likely to spoil.
So what were the recommended preservatives that seem very questionable?
The trouble with these saponins from roots is that the most convenient way to extract them involves soaking quite a while in a lot of water, and you don't have much shelf life left by the time that's done, yet it's enough trouble that you don't want to do it often. Did you obtain the soapwort in a form that requires soaking? Also, from what I've seen, that soaking technique results in a rather dilute product, such that you practically have to put it on your hair starting dry; it's a lot of water. But maybe the prep I saw wasn't typical.
If you want to prepare enough to use for a long time, how about freezing it by the cupful or whatever, and then melting a week's worth at a time that you can keep in the refrigerator? It won't need a preservative while it's frozen, and probably not while refrigerated.
Robert