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. 2019 Sep 23;24(19):3453. doi: 10.3390/molecules24193453

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© 2019 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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Equilibrium solubilities of six BAs in buffer solutions with different pH values: (A) pH = 2.0; (B) pH = 7.0; and (C) pH = 7.8–8.0. * indicates a statistically significant difference between frankincense and processed frankincense (p < 0.05). ** indicates a statistically highly significant difference between frankincense and processed frankincense (p < 0.01).