Skip to Main content Skip to Navigation
Journal articles

Extraction of green absolute from thyme using ultrasound and sunflower oil

Abstract : Absolute is the plant aroma isolate mostly used in the food and fragrance sectors. The use of organic solvents constitutes the most commonly used method for obtaining this aroma. However, this technique may leave trace amounts of solvents which are considered undesirable for these industries. In this work, a new green extraction approach was implemented using ultrasound (US) with sunflower oil (SO) as a natural solvent to produce green absolute from thyme (Thymus vulgaris). US optimal conditions for absolute yield were investigated using response surface methodology (RSM) and compared to conventional SO (SO-CV) and hexane (Hex-CV) extractions. The absolutes were analyzed by GC-MS for their chemical composition and tested for their antioxidant activities (total phenols, DPPH and frying test). Optimized conditions obtained by RSM for absolute yield were T = 50°C, t = 22 min, P = 98 W. The US using SO as solvent offers important advantages: shorter extraction time, increase of 47% in absolute yield compared to SO-CV extraction. Although the absolute obtained by hexane extraction provided improved yield (8.64 g/100 g DW), it contained around 75% of waxy materials. GC-MS analysis showed no remarkable variation of the chemical composition of the absolutes compared to those obtained by hexane extraction. Moreover, the US extraction allowed the highest recovery of monoterpene phenols thymol and carvacrol (86.2%). The absolute obtained by SO-US was free from waxes and organic solvent residues and exerted the highest antioxidant activity. Results show that ultrasound extraction using SO is a good alternative. It suggests the possibility of the production of green absolutes on pilot and industrial scale.
Complete list of metadata

https://hal.inrae.fr/hal-03194644
Contributor : Line Touloumet <>
Submitted on : Friday, April 9, 2021 - 4:18:24 PM
Last modification on : Tuesday, July 13, 2021 - 3:56:53 AM

File

2017 - Mnayer - ResourEffTechn...
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License

Identifiers

Collections

Citation

Dima Mnayer, Anne-Sylvie Fabiano-Tixier, Emmanuel Petitcolas, Karine Ruiz, Tayssir Hamieh, et al.. Extraction of green absolute from thyme using ultrasound and sunflower oil. Resource-Efficient Technologies, Elsevier, 2017, 3 (1), pp.12 - 21. ⟨10.1016/j.reffit.2017.01.007⟩. ⟨hal-03194644⟩

Share

Metrics

Record views

9

Files downloads

8