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      In vitroradical scavenging activity of essential oils from Columbian plants and fractions from oregano (Origanum vulgareL.) essential oil : IN VITROSCAVENGING ACTIVITY OF ESSENTIAL OILS FROM COLUMBIAN PLANTS

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      Flavour and Fragrance Journal
      Wiley-Blackwell

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          Antioxidant activity of plant extracts containing phenolic compounds.

          The antioxidative activity of a total of 92 phenolic extracts from edible and nonedible plant materials (berries, fruits, vegetables, herbs, cereals, tree materials, plant sprouts, and seeds) was examined by autoxidation of methyl linoleate. The content of total phenolics in the extracts was determined spectrometrically according to the Folin-Ciocalteu procedure and calculated as gallic acid equivalents (GAE). Among edible plant materials, remarkable high antioxidant activity and high total phenolic content (GAE > 20 mg/g) were found in berries, especially aronia and crowberry. Apple extracts (two varieties) showed also strong antioxidant activity even though the total phenolic contents were low (GAE < 12.1 mg/g). Among nonedible plant materials, high activities were found in tree materials, especially in willow bark, spruce needles, pine bark and cork, and birch phloem, and in some medicinal plants including heather, bog-rosemary, willow herb, and meadowsweet. In addition, potato peel and beetroot peel extracts showed strong antioxidant effects. To utilize these significant sources of natural antioxidants, further characterization of the phenolic composition is needed.
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            A novel method for measuring antioxidant capacity and its application to monitoring the antioxidant status in premature neonates.

            1. A new method has been developed for measuring the total antioxidant capacity of body fluids and drug solutions, based on the absorbance of the ABTS.+ radical cation. 2. An automated method for use on a centrifugal analyser, as well as a manual method, is described. 3. The procedure has been applied to physiological antioxidant compounds and radical-scavenging drugs, and an antioxidant ranking was established based on their reactivity relative to a 1.0 mmol/l Trolox standard. 4. The Trolox equivalent antioxidant capacity of plasma from an adult reference population has been measured, and the method optimized and validated. 5. The method has been applied to investigate the total plasma antioxidant capacity of neonates and how this may be compromised in prematurity.
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              Antioxidant Capacity of Tea and Common Vegetables

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                Author and article information

                Journal
                Flavour and Fragrance Journal
                Flavour Fragr. J.
                Wiley-Blackwell
                08825734
                September 2002
                September 2002
                : 17
                : 5
                : 380-384
                Article
                10.1002/ffj.1110
                46bc60ac-c81b-49cf-8aa0-569be2b7dc50
                © 2002

                http://doi.wiley.com/10.1002/tdm_license_1.1

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