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Secondary metabolites of cake samples. The data is represented as the mean ± SD of three replicates. According to Duncan’s test at p ≤ 0.05, the different letters represent the significance inside each bar. C-SCP1, C-SCP2, and C-SCP3: cakes with the addition of 1, 2, and 3% spent coffee powder, respectively; C-STP1, C-STP2, and C-STP3: cakes with the addition of 1, 2, and 3% spent tea powder, respectively.
