Will agar filtration remove proteases from fruits such as fig, ginger root, guava, kiwi fruit, mango, papaya or pineapple?
I'd like to make a fresh fig gelatin, but of course the proteases in fig make this difficult. If I make an agar clarification of the fresh fig puree, will the proteases be removed?
Best Answer
So, there are 2 problems with the possible solution of agar clarification:
1) Agar clarification (as far as I know) does involve heat to melt the agar and keep it melted - and usually you dissolve the agar IN the juice without any solvent, so, if you're going to heat up your juice enough for it to clarify, you're going to heat it up enough to break the proteases down. Bottom line, just boil the juice for the proteins to denaturate and save the money from the agar.
2) Proteases are very small protein chains and are unlikely to be completely removed by agar clarification. This process works because the agar "drags" the large molecules (like cellulose, etc.) and solids from the juice during the solidification process. You might remove some of the ficin, but not much. Also, issue #1 makes this answer redundant if you're not liking the idea of boiling your fruit...
Although, since your objective is to make some kind of solid from the fruit puree, why don't you use the agar itself to make the gel? You can use a small portion of the fruit juice/puree and then add the remainder later.
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Which fruits contain proteases?
Some fruits contain proteases; for example, pineapple, papaya, kiwi, and figs contain the proteases bromelain, papain, actinidin, and ficin, respectively.Why do fruits have protease?
Fruits contain enzymes Fruits like papaya, kiwifruit, pineapple and figs all contain enzymes called proteases. Proteases speed up the breakdown of proteins.Do oranges contain proteases?
Extra: In this activity you explored fruits that contain proteases, but many fruits do not contain proteases. You could repeat this activity using apples, blueberries, oranges, raspberries and strawberries\u2014all of which do not have proteases.What are the fruits do you usually use with gelatin?
Other Fruits That Keep Gelatin From Gelling Examples include figs, fresh ginger root, papaya, mango, guava, pawpaw and kiwi fruit. The enzymes in these fruits aren't exactly the same as the ones in pineapple. For example, the protease in papaya is called papain and the enzyme in kiwi is called actinidin.Attention Never Mix These 7 Fruits ! They Cause Serious Diseases
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Answer 2
agar clarification won't remove all proteases and probably won't remove any. Only very large macromolecules and solids are removed with agar filtration.
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