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I mixed 400gr of flour with 200 of starter, plus 280 ml of water and a bit of salt. I worked it with the slap and fold method and left it overnight. Sadly this morning I woke up to find it only about one third increased in volume. I had a similar experience two days ago, when I baked the loaf but the crumb was dense and the loaf went in the bin. Is there anything that I can do now to rescue the loaf before I bake it? Would it be possible to mix in some regular yeast for example? Thank for your help!

Laura
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If it’s currently winter for many of us, it’s possible that your dough just needs more time as bread rises slowly when it’s cold.

If that’s the case, you can try moving it to a warmer location

Although there is ‘instant yeast’, which can be mixed straight into dough as you’re making it, I don’t think it’s intended to be added after the dough is made, and further manipulation to get it well distributed may over knead the dough.

You also mentioned that you used ‘brown flour’ in a follow up comment. If this is not the same type of flour as what you have been feeding to your sourdough starter, it may be slower as the yeasts haven’t been specifically bred to consume that flour.

Joe
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I have had this problem in the past. Sometimes it’s hard to tell what went wrong, as wild yeast can be unpredictable and more sensitive to environment changes such as temperature, humidity, etc, than commercial yeast. I found that if I used a ratio of anything other than 1:1:1, (for example, 1:2:2 or 1:3:3, in my levain I can get less predictable results with my dough. When just feeding your starter, other ratios can be just fine to give your starter that extra food and water, but when making your levain to go directly into your dough, a 1:1:1 ratio is your safest bet, as this can maintain the best balance of yeast, healthy bacteria, flour, and water in your dough. Also, using flour that is different from the flour you normally feed your starter can alter the behavior of your levain, making it’s rise time slower or faster. For example: if you normally feed your starter a bit of rye to make it happy, but do not add rye into the flour ratio of your dough, the dough may not rise quite as vigorously. Hope this helps :)

Lori
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You can heat the oven a bit(1-2 Cº) while it rests.
I use this this trick when I want to make the bread faster.