JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 63 No 2 (2018): Journal of the Chilean Chemical Society
Original Research Papers

LIGNANS IN OLIVE STONES DISCARDED FROM THE OIL INDUSTRY. COMPARISON OF THREE EXTRACTION METHODS FOLLOWED BY HPLC-DAD-MS/MS AND ANTIOXIDANT CAPACITY DETERMINATION

Juan Pablo Inostroza
Department of Instrumental Analysis, Faculty of Pharmacy, University of Concepción
Javiera Troncoso
Department of Instrumental Analysis, Faculty of Pharmacy, University of Concepción
Claudia Mardones
Department of Instrumental Analysis, Faculty of Pharmacy, University of Concepción
Carola Vergara
Department of Instrumental Analysis, Faculty of Pharmacy, University of Concepción
Published June 25, 2018
Keywords
  • lignans,
  • pinoresinol,
  • olive stones,
  • Soxhlet,
  • supercritical fluid extraction,
  • HPLC
  • ...More
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How to Cite
Inostroza, J. P., Troncoso, J., Mardones, C., & Vergara, C. (2018). LIGNANS IN OLIVE STONES DISCARDED FROM THE OIL INDUSTRY. COMPARISON OF THREE EXTRACTION METHODS FOLLOWED BY HPLC-DAD-MS/MS AND ANTIOXIDANT CAPACITY DETERMINATION. Journal of the Chilean Chemical Society, 63(2). Retrieved from https://jcchems.com/index.php/JCCHEMS/article/view/685

Abstract

Lignans are secondary metabolites with diverse chemical structure, and are frequent in food grains. A lignan rich diet have a positive health impact over chronic diseases and protection against certain types of cancer. To enhance the intake of lignans the addition of this compound in processed food could be a solution, so the best approach is to find a source of lignans, especially one that is discarded as waste. In the olive oil production there is a large volume of phytotoxic waste generated, among these is the olive stone (OS), that it is generally burned for fuel. It has been reported the presence of lignans in olive stones extracted with methanol reflux.

Three extraction methods for lignans and polyphenolic compounds were assessed: solid-liquid ultrasound assisted extraction with basic hydrolysis, methanolic extraction with Soxhlet, and CO2 supercritical fluid extraction with methanol as a modifier. The determination of lignan content in OS samples were evaluated by HPLC with a core shell C18 column and the detection was in tandem with DAD and MS/MS. The extracts were also evaluated in their antioxidant capacity with ABTS, CUPRAC and ORAC assays and total polyphenol concentration.

The aim of this work is to evaluate different methods to extract lignans from OS discarded from the olive oil industry. The main lignan identified in OS extract was pinoresinol. The SFE method to extract pinoresinol was more efficient than Soxhlet and ultrasound assisted solid liquid extractions, producing a higher amount of pinoresinol in the extract in less time and with less amount of co-extracted interferents. The extract produced with Soxhlet had a higher antioxidant capacity.

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