Not sure. I experiment with adding lemon juice to a ltn for instance I can't eat cabbage raw since it makes me tired but with lemoj juice and prbbly after soaking it in water for 30mins greatly reduces this effect if not making it disappear.

I wonder if these seeds you speak of are sproutable... which can reduce tannins. Lemon juice and a little salt maybe might also help to reduce these also. Not too much salt though just a pinch in hthe soak water as you dont want to inhibit germination.