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New Research Reveals Why You Shouldn’t Add a Banana to Your Smoothies
(scitechdaily.com)
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this post was submitted on 27 Aug 2023
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I'm not in the right headspace to read any studies on it but based on my understanding of how food works on a chemical level I'd say it's a safe bet to say that the difference in preparation is mostly down to heat and steeping time.
If you steep for longer it gives the water more time to absorb flavanols.
If you use a temperate that is too high you'll denature or destroy the flavanols, whereas if you use a temperature that's too low they may not dissolve into the water as readily necessitating a longer steeping time.
Yeah I was thinking temperature. For example, you're not supposed to use boiling water for green tea, as it burns the tea. I've noticed this with many brands, however each brand tends to be a bit different - some are more tolerant to higher temperatures than others.
I imagine you can also do a multi-stage extraction, where you heat at a lower temperature and then at a higher temperature. This should avoid denaturing the lower temp compounds. It's commonly done with alcohol when extracting sugars into the wort.