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Subcritical Water Extraction of Mannitol from Olive Leaves

By S. M. Ghoreishi, R. Gholami Shahrestani and S. H. Ghaziaskar

Abstract

Abstract—Subcritical water extraction was investigated as a novel and alternative technology in the food and pharmaceutical industry for the separation of Mannitol from olive leaves and its results was compared with those of Soxhlet extraction. The effects of temperature, pressure, and flow rate of water and also momentum and mass transfer dimensionless variables such as Reynolds and Peclet Numbers on extraction yield and equilibrium partition coefficient were investigated. The 30-110 bars, 60-150˚C, and flow rates of 0.2-2 mL/min were the water operating conditions. The results revealed that the highest Mannitol yield was obtained at 100˚C and 50 bars. However, extraction of Mannitol was not influenced by the variations of flow rate. The mathematical modeling of experimental measurements was also investigated and the model is capable of predicting the experimental measurements very well. In addition, the results indicated higher extraction yield for the subcritical water extraction in contrast to Soxhlet method

Topics: Mannitol, Modeling, Olive leaves, Soxhlet extraction, Subcritical water
Year: 2011
OAI identifier: oai:CiteSeerX.psu:10.1.1.193.3860
Provided by: CiteSeerX
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