RESUMO
Objective: To optimize the extraction of total flavonoids from leaves of Psidium guajava. Methods: L9(34) orthogonal test was used to screen the optimal extraction technology of total flavonoids from leaves of P. guajava with ethanol concentration, solid-liquid ratio, extraction time, and extraction times as factors. The weight coefficient of the four evaluation indicators, including the yield of total flavonoids, hyperoside, quercetin-3-O-β-D-pyranarabinoside, and quercetin-3-O-α-L-furanarabinoside was calculated by information entropy weighting so as to calculate comprehensive score. We obtained the optimal technology by orthogonal analysis based on the comprehensive score. Results: The optimal extraction technology was that using 8-fold 70% ethanol water to extract 2 h for three times. The mean comprehensive score of the three batches was 0.142 1 and the RSD was 2.37%. Conclusion: The optimal extraction technology of total flavonoids from leaves of P. guajava was stable and feasible with high yield.
