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I heard from someone that you can use all purpose flour as cake flour by altering it's protein content by addition of sodium bicarbonate (baking soda).

Is this really true? If yes, can someone provide me with a ratio to do so.

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    I don't think that's true. You can approximate cake flour by using all-purpose flour and cornstarch. See: cooking.stackexchange.com/questions/39593/… – Jolenealaska Feb 24 '17 at 12:59
  • There was a question a couple of years ago about acidity and gluten (cooking.stackexchange.com/questions/43884/…). So it's possible that it could work. – Joshua Engel Feb 24 '17 at 15:56
  • Will at most change the protein texture, not much the content! – rackandboneman Feb 24 '17 at 16:10
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    Did that person mean that you can use plain flour + baking powder in a recipe that calls for self-rising flour? – rumtscho Feb 24 '17 at 17:31
  • Jolenealaska and rumtscho are sending you in the right direction I think. Cornstarch + AP is your substitute. Not exactly the same, but should behave and task fairly close. AP + baking powder + bit of salt is self-rising. – dlb Feb 24 '17 at 17:42
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Sodium bicarbonate on its own is not baking powder but baking soda. A mixture of such with all purpose flour will not change the content of gluten-producing proteins beyond very slightly lowering their content per equal (to AP flour) weight of mixture.

The way the gluten forms in a dough/batter, and the way the whole product will brown/caramelize while baking, will actually be somewhat altered due to alkalinity, but this would still not mean equivalent behaviour to cake flour. Also, potential extra leavener (if an acid is present) will be there in addition to what the recipe describes.

What such a mixture, if using actual baking powder instead of baking soda, could be intended to substitute for would be self raising flour.

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    Also, potential extra leavener (if an acid is present) will be there And if you don't have sufficient acid to react with the baking soda, you'll probably get to taste the baking soda. Blech! – Shannon Severance Feb 24 '17 at 19:08
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    so to the wording and the point of the question, this does not "change" the protein content of the flour, it alters how the protein behaves. – Alaska Man Feb 25 '17 at 12:42
  • Excess baking soda is sometimes intentionally added to cookies (even such that you very much do not want leavened)... but in most other applications, "blech" (German for "sheet metal", and that's how it will taste :) ) – rackandboneman Feb 27 '17 at 8:20

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