Microwave and ultrasound-assisted extraction of monomeric anthocyanin pigment content from plant residuals

Dobozi Réka and Jákói Zoltán and Keszthelyi Krisztina and Beszédes Sándor: Microwave and ultrasound-assisted extraction of monomeric anthocyanin pigment content from plant residuals.

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Abstract

Our investigation focused on the intensification of monomeric anthocyanin pigment content (MAC) extraction from raspberry residuals by using microwave (MW) and ultrasound (US) radiation with different solvents, and to monitor the efficacy of these processes by the assessment of the dielectric behavior of the extracts. All the experiments were carried out with using 5 grams of the raspberry raw material mixed with 100 cm3 of three different solvents – distilled water, hydrochloric acid, and the mixture of HCl and citric acid – separately. For the intensification processes, microwave and ultrasonic radiation were used in three different total irradiated energy input values: 30 kJ, 45 kJ and 60 kJ. The MAC content was analyzed according to the AOAC official method for total monomeric anthocyanin pigment content, while the dielectric behavior of the extracts was analyzed with laboratory dielectric assessment kit. Our results revealed that using MW irradiation as an intensifying process for extraction can be effectively used in the lower irradiated energy range (30 kJ), and the higher level of power (500W) is more efficient, regardless of the applied solvent. If, however, ultrasonic radiation is being used, usually the higher the energy intensity, the higher the yield of MAC can be observed. The assessment of dielectric behavior proved that a strong correlation (r=0.98-0.99) can be found between the dielectric constant (ε’) and the MAC concentration of the extracts, regardless of the intensifying method and solvent used.

Item Type:	Conference or Workshop Item
Journal or Publication Title:	Proceedings of the International Symposium on Analytical and Environmental Problems
Date:	2023
Volume:	29
ISBN:	978-963-306-963-9
Page Range:	pp. 136-140
Language:	English
Publisher:	University of Szeged
Place of Publication:	Szeged
Event Title:	29th International Symposium on Analytical and Environmental Problems
Event Type:	Conference
Event Location:	Szeged
Event Dates:	2023. november 13-14.
Related URLs:	https://acta.bibl.u-szeged.hu/82256/
Uncontrolled Keywords:	Extrakció, Vegyipari műveletek, Analitikai kémia
Additional Information:	Bibliogr.: 140. p. ; ill. ; összefoglalás angol nyelven
Subjects:	01. Natural sciences 01. Natural sciences > 01.04. Chemical sciences
Date Deposited:	2023. Nov. 22. 13:19
Last Modified:	2023. Nov. 22. 13:19
URI:	http://acta.bibl.u-szeged.hu/id/eprint/82395

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