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Ultrasound versus microwave as green processes for extraction of rosmarinic, carnosic and ursolic acids from rosemary.

Ultrasonics sonochemistry (2015-07-19)
M Jacotet-Navarro, N Rombaut, A-S Fabiano-Tixier, M Danguien, A Bily, F Chemat
ABSTRACT

Ultrasound and microwave as green processes are investigated in this study, focusing on the extraction selectivity towards antioxidant extraction from rosemary leaves. Due to its richness in valuable compounds such as rosmarinic, carnosic and ursolic acids, rosemary is a reference matrix for extraction study. In this work, six alternative processes are compared: ultrasound (bath, reactor and probe), microwave (reflux under microwave, microwave under nitrogen pressure and microwave under vapor pressure). The main result of this study is that selective extraction can be achieved according to extraction techniques and therefore to the extraction process.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ethyl alcohol, Pure, 200 proof, anhydrous, ≥99.5%
Sigma-Aldrich
Ethyl alcohol, Pure, 190 proof, meets USP testing specifications
Sigma-Aldrich
Ethyl alcohol, Pure, 190 proof, ACS spectrophotometric grade, 95.0%
Sigma-Aldrich
Ethanol, anhydrous, denatured
Sigma-Aldrich
Rosmarinic acid, ≥98% (HPLC), from Rosemarinus officinalis L.
Sigma-Aldrich
Ursolic acid, ≥90%
Sigma-Aldrich
Ethanol Fixative 80% v/v, suitable for fixing solution (blood films)
Sigma-Aldrich
Rosmarinic acid, 96%
Supelco
Ethanol standards 10% (v/v), 10 % (v/v) in H2O, analytical standard