Antioxidant activity of extracts obtained by different isolation procedures from some aromatic herbs grown in Lithuania
✍ Scribed by Dapkevicius, Airidas; Venskutonis, Rimantas; van Beek, Teris A; Linssen, Jozef P H
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 314 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
An increasing demand for natural additives has shifted the attention from synthetic to natural antioxidants. The present work examines the potential of some aromatic herbs grown in Lithuania as a source of natural antioxidants : marjoram (Majorana hortensis Moench), catnip (Nepeta cataria L), oregano (Origanum vulgare L), lavender (L avandula angustifolia Mill), thyme (T hymus vulgaris L), hyssop (Hyssopus officinalis L), anise hyssop (L ophantus anisatus Benth), and sage (Salvia officinalis L). Dried herb samples were submitted to extraction with supercritical acetone or methanol/water and hydrodistillation. CO 2 , Deodorised herb samples (after removal of essential oil) were also extracted with acetone. The antioxidant activity of these extracts, essential oils and dried deodorised aqueous extracts was assessed by the b-carotene bleaching test (di †usion and spectrophotometric methods). The highest yields of extracts were obtained using polar solvents. Thyme and sage acetone oleoresins showed high antioxidant activity in the tests performed and were regarded as the most promising sources.