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In vitro antioxidant analysis of supercritical fluid extracts from rosemary (Rosmarinus officinalis L.)

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Abstract

Different supercritical fluid extraction conditions were tested on rosemary leaves using a pilot-plant-scale extractor. Each of them provided two separated fractions which were characterized chemically by liquid chromatography–diode-array detection–mass spectrometry using electrospray in the positive mode. Twelve compounds were identified, including phenolic diterpenes and flavonoids. Owing to the lack of available standards, only carnosic acid could be quantified. The antioxidant activity of the extracts was determined by the 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH) test and the β-carotene bleaching test was used to study the differences in behavior of antioxidants in an emulsified medium for some of the extracts obtained. The results of the correlation studies to examine the relationship between the antioxidant activity (EC50), obtained by using the DPPH test, and the concentration of all the compounds detected in the extracts showed that carnosic acid was the more correlated compound, with a coefficient of correlation of −0.87. Using forward stepwise multiple linear regression, carnosic acid, methyl carnosate and carnosol were the compounds selected to predict the mentioned activity, with a value of 0.95 for the coefficient of determination.

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Acknowledgements

This work was supported by AL Air Liquide (Madrid, Spain) and by CICYT projects (AGL2004-06893-C02-01 and AGL2000-0448). The authors thank Chubby Vicente for her kind help in the acquisition of the MS spectra. S.C. thanks the Ministerio de Ciencia y Tecnología for a grant.

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Authors and Affiliations

  1. Área de Tecnología de Alimentos, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Cantoblanco, Madrid, Spain

    Sofía Cavero, Laura Jaime, F. Javier Señoráns & Guillermo Reglero

  2. Departamento de Caracterización de Alimentos, Instituto de Fermentaciones Industriales (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain

    Pedro J. Martín-Álvarez & Elena Ibañez

Authors
  1. Sofía Cavero
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  2. Laura Jaime
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  3. Pedro J. Martín-Álvarez
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  4. F. Javier Señoráns
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  5. Guillermo Reglero
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  6. Elena Ibañez
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Corresponding author

Correspondence to Elena Ibañez.

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Área de Tecnología de Alimentos, Facultad de Ciencias, Universidad Autónoma de Madrid is an associated unit of IFI-CSIC.

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Cavero, S., Jaime, L., Martín-Álvarez, P.J. et al. In vitro antioxidant analysis of supercritical fluid extracts from rosemary (Rosmarinus officinalis L.). Eur Food Res Technol 221, 478–486 (2005). https://doi.org/10.1007/s00217-005-1139-y

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  • DOI: https://doi.org/10.1007/s00217-005-1139-y

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