I’ve tried out LaraCare A200… and couldn’t see/feel anything happening. It requires quite high inclusion rates and then results in a weird skin feel. Arabinogalactans (galactan chains with arabinose branches) are the main constituent for example of gum arabic. The larch tree derived galactoarabinan is part of the tree’s hemicellulose, doesn’t resemble any gum, and doesn’t affect viscosity. That it reduces micelle size and the film forming property were reasons why I’ve tried it out. Alas, I don’t know if it does so or not (I don’t have access neither to a Zetasizer nor a skin humidity sensor ;( ). Feel and chemistry wise, I do have my doubts that it can reduce TEWL… I would have guessed the opposite. In my case, it did hamper the initial emulsification process and I needed to add it afterwards (which is totally stupid cause then, it can’t reduce micelle size as effectively). Maybe it was just my formulations and it works great with others… I think it has a similar effect on emulsions than bentonite but with a less visible viscosity increase and requires quite high inclusion rates.
You may market galactoarabinans also as prebiotics (that they are prebiotics only for the intestinal flora doesn’t need to appear in the marketing blurb).
Thanks for the AHA tip. At least I know what to do with the remaining sample.