Psidium guajava L. has gained a special attention as health plant due to the presence of phenolic compounds. Box-Behnken design (BBD) has been applied for the extraction of target compounds from guava leaves via sonotrode ultrasound-assisted extraction (UAE). Different extraction times (5, 30, and 55 min), ratios of ethanol/water (50, 75, and 100% (v/v)), and ultrasound (US) power (80, 240, and 400 W) were tested to find their effect on the sum of phenolic compound (SPC), flavonols and flavan-3-ols via HPLC-ESI-QqQ-MS, and antioxidant activity (DPPH and TEAC assays). The best process conditions were as follows: 40 min, 60% ethanol/water (v/v), and 200 W. Established method has been used to extract phenolic compounds in two guava leaves varieties (pyrifera and pomifera). Pyrifera var. showed greater values of the SPC via HPLC-ESI-QqQ-MS (49.7 mg/g leaf dry weight (d.w.)), flavonols (12.51 mg/g d.w.), flavan-3-ols (7.20 mg/g d.w.), individual phenolic compounds, and antioxidant activity (8970 ± 5 and 465 ± 6 μmol Trolox/g leaf d.w, respectively) than pomifera var. Conventional extraction showed lower amounts of phenolic compounds (7.81 ± 0.03 and 4.64 ± 0.01 mg/g leaf d.w. for flavonols and flavan-3ols, respectively) in comparison to the ultrasound-assisted ones.
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The author Elixabet Díaz-de-Cerio would like to thank to the University of Granada and the CEIBiotic for the “Convocatoria de movilidad internacional de jóvenes investigadores de programas de doctorado” grant. Vito Verardo thanks the Spanish Ministry of Economy and Competitiveness (MINECO) for “Juan de la Cierva” post-doctoral contract.
Compliance with Ethical Standards
Conflict of Interest
Elixabet Díaz-de-Cerio that she has no conflict of interest. Urszula Tylewicz that she has no conflict of interest. Vito Verardo that he has no conflict of interest. Alberto Fernández-Gutiérrez that he has no conflict of interest. Antonio Segura-Carretero that he has no conflict of interest. Santina Romani that she has no conflict of interest.
This article does not contain any studies with human or animal subjects.
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