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Revista Lasallista de Investigación
Print version ISSN 1794-4449
Abstract
TORRES-VALENZUELA, Laura Sofía; SERNA-JIMENEZ, Johanna Andrea; PINTO, Valentina and VARGAS, Daniel. Evaluation of conditions of ultrasound assisted extraction of yellow pitahaya peel bioactive compounds. Rev. Lasallista Investig. [online]. 2020, vol.17, n.1, pp.70-83. Epub Jan 28, 2021. ISSN 1794-4449. https://doi.org/10.22507/rli.v17n1a6.
Introduction:
the extraction of polyphenols has taken an interest due to the relationship it has with the prevention of oxidative stress and beneficial effects on health in the prevention of non-communicable diseases. These are commonly found in some fruits, so their extraction has become a trend to obtain products with high added value. Ultrasound is a technique that can decrease the extraction time of these biocomponents.
Objective:
the main objective of this work was to evaluate the conditions of the ultrasound-assisted extraction of polyphenols with antioxidant activity in dehydrated peel yellow pitahaya.
Materials and methods:
the kinectis drying was made at 60 °C, in order to decrease deterioration reactions. For the extraction, a solution of 96% ethanol (V / V) was used as disolvent; the ratio Peel-Disolvent was 1:1. The process was performed at 25 °C and 37 kHz frequency. A central composite design was used, in which the effect of power (40 - 80%) and ultrasonication time (11.90 -33.10 minutes) were evaluated. One control point was evaluated with Soxhlet extraction. The extracted amount of polyphenols and antioxidant capacity was determined by Folin-Ciocalteau and ABTS methods, respectively.
Results:
lower time exposures and higher sonication power were associated with increases in polyphenols and antioxidant capacity. In particular, ultrasound-assisted extraction in 60% power and 11 min, obtained 77% more polyphenols than 24-h standard method (Soxhlet).
Conclusion:
Ultrasound has potential compared to the traditional technique to reduce the processing time in biocomponent extraction, in this case taking advantage of the yellow pitahaya peel that is considered as a residue, polyphenol concentrations of 973.10 mg / L were found that They can be extracted by ultrasound at 222 W nominal power (60%), 35kHz frequency and 22 minutes and with an antioxidant capacity of over 90%.
Keywords : Polyphenols; antioxidants; Drying; by-products; Selenicereus megalanthus.