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Cumulative release of doxorubicin (DOX) from Eu/MBGs in PBS with different pH values (a–c) and fitted to the first 12 h of data by the Higuchi model (a’–c’). (a,a’) DOX release at pH 8.6, (b,b’) DOX release at pH 7.4, (c,c’) DOX release at pH 4.3; black “●” symbols 0 Eu/MBGs; red “●” symbols 0.5 Eu/MBGs; blue “●” symbols 1 Eu/MBGs; magenta “●” symbols 2 Eu/MBGs.
