Extraction of bioactive compounds from juçara pulp (Euterpe edulis M.) is affected by ultrasonic power and temperature

Temperatura e potência ultrassônica afetam a extração de compostos bioativos da polpa de juçara (Euterpe edulis M.)

ABSTRACT

Anthocyanins and phenolic compounds from fruits and vegetables can be extracted using emerging technologies such as ultrasound-assisted extraction. This study aimed to investigate the effect of temperature and ultrasonic power on the extraction of anthocyanins, phenolic compounds from the extracts of juçara pulp (Euterpe edulis M.). We also determined the antioxidant capacity of the extract and determined characteristics of the pulp. Bioactive compounds were extracted in an ultrasonic bath (25 kHz) at various temperatures (25, 32, 39, 46, 53 °C) and ultrasonic power (0, 360, 900 W). Juçara pulp had high total anthocyanin and phenolic content (298.86 ±27.68 mg cyanidin-3-glucoside/100 g and 1226.39 ±21.08 mg GAE/100 g on a wet basis, respectively). Cyanidin-3-rutinoside was the major anthocyanin in the extract, followed by cyanidin-3-glucoside, which were identified and quantified by high-performance liquid chromatography. For obtaining extracts rich in anthocyanins and phenolic compounds, we suggest that the extraction process should be performed at 25 °C without the application of ultrasonic waves. However, to obtain extracts with outstanding antioxidant capacity, an ultrasonic power of 360 W at a frequency of 25 kHz and a temperature of 25 °C should be used.

Index terms:
Anthocyanins; antioxidant capacity; characterization; phenolic compounds; ultrasound-assisted extraction