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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Response surface contour showing combined effects of enzymatic treatment conditions on flavonoid content (TFC). (A) enzyme concentration and pH; (B) time and pH; (C) temperature and pH; (D) time and enzyme concentration; (E) temperature and enzyme concentration; (F) temperature and time.