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. 2021 Jun 18;76:105635. doi: 10.1016/j.ultsonch.2021.105635

Fig. 11.

Fig. 11

•OH-mediated reaction pathways and Gibbs free energies (kcal mol−1) for the oxidative degradation of caffeine at pH 4.0 to produce P3, P4 (a), P32, P33, P42, P5 and P6 (b).