can anyone hare tell me dosages of pareben as preservative in water base formulation of soya proteine powder & seaweed extract
0.15 % would be adequate. If available, mixtures of equal amounts of propyl- and methyl- paraben are better than the same amount of each one (there is synergistic effect). It's also worth mentioning that prservative effect is good at neutral pH, better at acid pH, worse at alkaline.
Don't forget to check the legislation of the country where it will be used. They are normally seen in cosmetics (see the link) and pharmaceuticals. In foods, you can take a look at Canadian legislation (see the link)
http://www.fda.gov/Cosmetics/ProductsIngredients/Ingredients/ucm128042.htm
http://www.hc-sc.gc.ca/fn-an/securit/addit/list/11-preserv-conserv-eng.php
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