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Optimization of solvent free microwave extraction of natural antioxidant from wood waste

Abstract : Solvent Free Microwave Extraction (SFME) of oil from maritime pine wood waste and its antioxidant activity were investigated and compared to classical hydrodistillation (HD) method (Clevenger apparatus). A central composite design combined with response surface methodology was applied to evaluate the simultaneous influences of irradiation power, irradiation time and moisture content before SFME. A maximal extraction yield of 0.43% (g/100 g dry wood waste) was achieved under optimal extraction time of 43 min and an irradiation power of 668 W compared 0.28% obtained for the conventional method (HD). The results also showed that the three independent variables had a statistical significant effect on the considered response as well their quadratic effects. Gas chromatography coupled to mass spectrometry (GC-MS) analysis showed that SFME extract is richer in oxygenated compounds (~58.5%) compared to HD extract (34.1%). The comparison of total phenolic compounds (TPC) showed that under optimized condition of SFME procedure, the amount of TPC was 74.6 mg GAE/g extract, largely higher than that obtained for HD extraction (51.2 mg GAE/g extract) suggesting that SFME represents an interesting alternative technology for production of recoverable oil from waste issued from maritime pine wood waste. Moreover, the antioxidant activity assessed by 2,2-diphenyl-1-picrylhdrazyl (DPPH) test showed that the concentration that inhibit 50 of DPPH radical was lower for SFME (15.4 µg/ml) compared to HD (123 µg/ml and to a synthetic antioxidant (BHT) (24µg/ml).
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Contributor : Line Touloumet <>
Submitted on : Friday, April 9, 2021 - 3:49:25 PM
Last modification on : Saturday, April 10, 2021 - 3:33:01 AM


  • HAL Id : hal-03194534, version 1



Alice Meullemiestre, Zoulikha Maache-Rezzoug, Farid Chemat, Sid-Ahmed Rezzoug. Optimization of solvent free microwave extraction of natural antioxidant from wood waste. Journal of Materials and Environmental Sciences, 2017, 8 (8), pp.2608-2618. ⟨hal-03194534⟩



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