Ethanol Thymus serpyllum extracts: evaluation of extraction conditions via total polyphenol content and radical scavenging activity

Aleksandra Jovanović, Mihaela Skrt, Predrag Petrovic, Ivona Častvan, Gordana Zdunic, Katarina Savikin, Branko Bugarski

DOI: http://dx.doi.org/10.5937/leksir1939023J

Abstract


The aim of the present study was the optimization of the extraction conditions (particle size, solid-to-solvent ratio, extraction time and procedure) via total polyphenol content and radical scavenging activity, using wild thyme as a natural source of polyphenols. According to the total polyphenols yield, particle size, solvent-to-solid ratio and extraction technique have shown statistically significant influence, whereas the exposure time has not been relevant factor. In all three extraction procedures (maceration, heat- and ultrasound-assisted extraction), the highest polyphenols yield was reached using the smallest plant particles and the highest solvent-to-solid ratio. Moreover, polyphenols content was significantly better after ultrasound-assisted extraction, in comparison to the extraction at room and high temperature. According to the antioxidant recovery, the influence of different extraction parameters varied depending on the applied antioxidant tests and extraction procedures. 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) ˗ ABTS radical scavenging capacity of extracts followed the next trend: maceration and ultrasound-assisted extraction > heat-assisted extraction, while in 2,2-diphenyl-1-picrylhydrazyl ˗ DPPH neutralization: ultrasound-assisted extraction > heat-assisted extraction >> maceration. The study represents an important step in formulation of antioxidants-rich extracts with potential use in food, pharmaceutical and cosmetic industry.


Keywords


extraction, wild thyme, total polyphenols, radical scavenging activity

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References


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Copyright (c) 2019 Aleksandra A. Jovanović, Mihaela Skrt, Predrag Petrovic, Ivona Častvan, Gordana Zdunic, Katarina Savikin, Branko Bugarski



ISSN 0455-6224 (Print)
ISSN 2560-3965 (Online)

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