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Aqueous extraction of anthocyanins from Hibiscus sabdariffa : Experimental kinetics and modeling

Cisse M., Bohuon P., Sambe F., Kane C., Sakho M., Dornier M.. 2012. Journal of Food Engineering, 109 (1) : p. 16-21.

DOI: 10.1016/j.jfoodeng.2011.10.012

Solid-liquid extraction of anthocyanins from calyces of Hibiscus sabdariffa L. was studied to evaluate the influence of the operating parameters. Solid-to-solvent ratio and particle size had the main impact on anthocyanin extraction efficiency. Maximum yield of anthocyanins (88%) was obtained at 25 °C with the highest solid-to-solvent ratio (1/25). The decrease in the particle size of the calyces from 2 cm to 150 ?m drastically reduced the extraction time. The increase of temperature reduced the extraction time by increasing the diffusion coefficient (3.9 × 10?11-1.35 × 10?10 m2 s?1 between 25 and 90 °C) but did not modify the extraction yield. A simple extraction model that integrated anthocyanin thermo-degradation kinetic was proposed. A good agreement between the predicted results of the models and experimental data was demonstrated. From a solid-to-solvent ratio of 1/5, an extraction yield of 63% and an anthocyanin concentration of 0.3 g L?1 could be obtained in less than 10 min.

Mots-clés : hibiscus sabdariffa; anthocyane; extraction; france; sénégal

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