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Open AccessArticle

Antioxidants Profiling of By-Products from Eucalyptus Greenboards Manufacture

1
Laboratory of Research and Development of Analytical Solutions (LIDSA), Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Chemistry, Campus Vida, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
2
Betanzos HB, Betanzos-Santiago Road, Km 3, E-15300 Betanzos, A Coruña, Spain
*
Author to whom correspondence should be addressed.
Antioxidants 2019, 8(8), 263; https://doi.org/10.3390/antiox8080263
Received: 10 July 2019 / Revised: 29 July 2019 / Accepted: 30 July 2019 / Published: 1 August 2019
(This article belongs to the Section Methods for Antioxidants Evaluation/Measurement)
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Abstract

Three different by-products from the Eucalyptus wood industry have been exhaustively characterized to find compounds with antioxidant properties. The industrial process to manufacture Eucalyptus greenboards is distinguished by using just wood and water, which converts the generated by-products in a highly attractive source of bioactive compounds that are originally in the raw material. The studied by-products were: the screw water, derived from the washing of the wood chips; the condensates, obtained after the evaporation and further condensation of the screw water; and finally, the concentrate of eucalyptus. For all of them and for their derived organic extracts, the total polyphenols content (TPC) and antioxidant activity (AA) have been evaluated. The chromatographic fingerprints, based on gas chromatography-mass spectrometry (GC-MS), and liquid chromatography-tandem mass spectrometry (LC-MS/MS) have been obtained to identify the main extractable organic wood components. Besides, solid-phase microextraction (SPME) has been employed to characterize the most volatile compounds. Significant differences were observed for the chromatographic profiles of the studied by-products. Up to 48 and 30 different compounds were identified in the screw water, and condensate by-products, respectively; whereas the highest number of compounds, up to 72, have been identified in the organic extracts derived from the concentrate of Eucalyptus, highlighting the presence of monoterpenes, sesquiterpenes, polyphenols, and other bioactive compounds with antioxidant properties. Therefore, these by-products could be exploited to obtain natural extracts with added value which could be reused in the food, cosmetic or pharmaceutical industry, reducing the environmental impact of the industrial activity. View Full-Text
Keywords: bioactive compounds; wood industry by-products; antioxidants; analytical characterization bioactive compounds; wood industry by-products; antioxidants; analytical characterization
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Celeiro, M.; Lamas, J.P.; Arcas, R.; Lores, M. Antioxidants Profiling of By-Products from Eucalyptus Greenboards Manufacture. Antioxidants 2019, 8, 263.

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