Caffeine and fermentation

Asked May 3, 2018, 2:58 PM EDT

When a product ferments, is caffeine removed?

Mecklenburg County North Carolina

1 Response

NC State University has done very little research in this area. I have linked two sites below which discuss caffeine in tea. Both seem to indicate that fermentation increases the caffeine content.
https://www.teavivre.com/info/effect-of-fermentation-on-caffeine-content-in-tea.html

http://www.caffeine-content.com/caffeine-in-tea/caffeine-content-in-tea/

This research paper found that change in caffeine level depended on the type of fermentation. (Molds fermentation increased the caffeine content, but yeasts fermentation decreased the caffeine content.)
https://www.sciencedirect.com/science/article/pii/S0308814607009429