ISHS Acta Horticulturae 503: II WOCMAP Congress Medicinal and Aromatic Plants, Part 4: Industrial Processing, Standards & Regulations, Quality, Marketing, Economics
OBTENTION OF ROSEMARY ANTIOXIDANT OLEORESINS BY MECHANICAL EXTRACTION WITH NON VOLATILE SOLVENT AND UNDER PRESSURE |
| Authors: | A.R. Tymoschuk, R. Mato, J. Luna |
| Keywords: | rosemary antioxidant oleoresin, mechanical extraction, solvent extraction |
| Abstract:
The objective of the present work was to assess the efficiency of mechanical extraction of Rosmarinus officinalis antioxidant oleoresin in the laboratory. The results were compared with those obtained by volatile solvent extraction. Oleoresin was obtained by pressing a mixture of rosemary ground dry leaves and medium chain triglycerides (MCT). The mixture was subjected to gradually increasing pressure from 50 bars to 100 – 250 bars. The oil, which was a little turbid, was filtrated and purified. Several experiences at different temperatures were carried out. The extraction with volatile solvent was accomplished by percolation of dry rosemary with ethanol in inert atmosphere. The extract obtained was filtrated and centrifuged. The content of Carnosic Acid (CA), the main antioxidant compound in rosemary, was determined by HPLC. In both volatile solvent extraction and extraction under pressure processes, oleoresins with 3 to 7% of CA were obtained. These values are in order of those of commercial oleoresins. The antioxidant oleoresin efficiencies were tested in lard samples. The oxidation of samples was carried out at 80°C and static conditions (oven test). Peroxide value was measured during several days. A good performance of the products of both processes was observed. | |
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