Various, Book of American Baking
“ Potato flour is a yeast food. It contains gelatinized starch, sugar, dextim amides and mineral matter, all of the bodies are yeast nutrients, the first-named being converted into sugar by a ferment in the yeast. The analysis of pure imported potato flour should approximately show as follows: Water, 10.69 per cent.; protein, 6.59 per cent; fat, 0.23 per cent; nutritious extractive matter, 78.73 per cent; fibre, 1.18 per cent; ash, 2.58 per cent, making in all a total of 100 per cent.The extractive matter is mostly carbo-hydrates (sugar) . The ash, the mineral matter, mostly phosphates. ”
