Has anyone had success with giving their bread or all-purpose flour an extra gluten kick by adding vital wheat gluten? I would like to know what ratio to mix the the two ingredients with, or perhaps some hints at a formula that can help me accomplish this, assuming it is feasible (i.e. mixing will produce a close substitute for high-gluten flour). I'm also interested in any quality differences with this mixed approach vs. just using high-gluten flour in recipes.
You can assume I'm using King Arthur bread flour and King Arthur vital wheat gluten (or analogously King Arthur AP flour and vital wheat gluten), and that I'll be baking bread with the flours.
Note: this related question (When adding vital wheat gluten to a bread recipe, should one reduce the amount of flour equal to it?) mentions mixing, but doesn't go into details on ratios, etc.
Yes, and it is very easy. I do it all the time.
You only need a very simple calculation. You don't even have to be precise.
If you do want precision, you will have to find out 1) how much of your flour protein is gluten, 2) how much of your "vital wheat gluten" is gluten, and 3) how much gluten content you need for your recipe. Then use a simple rule-of-three calculation to get the amount needed to add.
I usually don't bother, because 1) and 2) is information which is very hard to find, and due to the large difference in gluten weight and complete weight, imprecision from not using true proportions is minimal. What I do is:
This doesn't produce exactly 12.5% gluten content, but I think that it is within the tolerance of most recipes; indeed, not all commercial flours are exactly 12.5%, they vary with brand and season.
I add the powder to the flour and mix it well before making the bread. If I am using a preferment, I add all the gluten to the preferment and make the non-fermenting part with AP flour only, so my gluten can benefit from longer autolysis.
I have no direct comparison with "true" bread flour, as I have never used it. But my breads requiring bread flour turn out good for my standards. There is no problem with bad distribution, the dough turns out very smooth and evenly elastic. There is a pronounced difference to using AP flour only.
Thanks to rumtscho for pointing me in the right direction, I came up with a formula that'll accomplish the math described by rumtscho and cranbo on thefreshloaf.com:
targetPercentProtein = (flourPercentProtein * x) + (vitalGlutenPercentProtein * y) (100 - targetPercentProtein) = ((100 - flourPercentProtein) * x) + ((100 - vitalGlutenPercentProtein) * y)
In the equations,
x represents the percent of your flour to mix with
y percent of your vital gluten.
Here's we'll convert KA Bread Flour (12.7% protein) and KA Vital Wheat Gluten (77.8% protein) into KA Sir Lancelot Flour (14.2% protein):
14.2 = 12.7x + 77.8y (100 - 14.2) = (100 - 12.7)x + (100 - 77.8)y
To solve this math, we can simply copy and paste the equations into WolframAlpha.com, equations separated by a comma (example):
This tells us we use 97.7% KA Bread Flour with 2.3% KA Vital Wheat Gluten
(e.g. 977g KA Bread with 23g KA Vital Wheat Gluten gives us 1000g KA Sir Lancelot)
Here's we'll convert KA All-Purpose Flour (11.7% protein) and KA Vital Wheat Gluten (77.8% protein) into KA Sir Lancelot Flour (14.2% protein):
14.2 = 11.7x + 77.8y (100 - 14.2) = (100 - 11.7)x + (100 - 77.8)y
Again, we can simply copy and paste the equations into WolframAlpha.com, equations separated by a comma (example):
This tells us we use 96.2% KA All-Purpose Flour with 3.8% KA Vital Wheat Gluten
(e.g. 962g KA All-Purpose with 38g KA Vital Wheat Gluten gives us 1000g KA Sir Lancelot)
I use 1 tsp wheat gluton per 1 cup of all purpose flour, for my white breads and sweet doughs. In whole wheat bread I use 2 tsp per cup of wheat or rye flour, Sure does make things raise nicely.
I don't measure flour by the cup anymore - too many cooking shows and online forums have changed that method. I weigh my flour on a reasonably priced dial kitchen scale, because measuring by the cup is so dependent on how packed the flour is in the cup.
A cup of flour is generally 125 grams (500 grams, or 4 cups of flour is an almost standard recipe proportion).
A teaspoon per cup (or per 125 grams) of flour is the generally accepted proportion. The increased percentage of gluten is still a somewhat vague creature, as no two batches of flour are exactly the same, although 'standard averages' are available, but the overall increase within those variances, is sufficient to provide better stretchability and tooth to baked goods. I especially like it for homemade pizza and pretzels!