Integrated Supercritical Fluid Extraction and Bioprocessing
Owen Catchpole, Stephen Tallon, Peter Dyer, Fernando Montanes, Teresa Moreno, Erika Vagi, Wayne Eltringham and Jagan Billakanti
DOI : 10.3844/ajbbsp.2012.263.287
American Journal of Biochemistry and Biotechnology
Volume 8, Issue 4
Supercritical fluids are increasingly being used and promoted at a laboratory and pilot scale to produce high value, natural bioactives from biologically based raw materials. Supercritical CO2 is overwhelmingly the solvent of choice for these operations, but is largely limited to the processing of dry raw materials and the extraction of low polarity, low molecular weight compounds. The use of co-solvents and the use of alternative ‘near-critical’ extraction fluids such as dimethyl ether show potential to mitigate these limitations. Commercialisation of new supercritical extraction processes has arguably been limited because the supercritical extraction process has been developed in isolation of other processing steps necessary to achieve a successful product. This study reviews recent developments in integrated processing that incorporate the use of supercritical fluids for bioseparations and in particular process schemes that produce high value natural bioactives. Integrated processes include prior operation (fermentation, extraction, enzyme pre-treatment, physical fractionation or size reduction) followed by supercritical extraction or fractionation and processes in which operations are carried out in situ in supercritical fluids (supercritical chromatography, enzymatic conversion, precipitation and coating of solutes). The use of co-solvents and alternative extraction solvents in these processes is discussed. Prospects for future developments are also discussed.
© 2012 Owen Catchpole, Stephen Tallon, Peter Dyer, Fernando Montanes, Teresa Moreno, Erika Vagi, Wayne Eltringham and Jagan Billakanti. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.