Issue 47, 2022

Recovery of bacterioruberin and proteins using aqueous solutions of surface-active compounds

Abstract

Haloarchaea microorganisms are little explored marine resources that can be a promising source of valuable compounds with unique characteristics, due to their adaptation to extreme environments. In this work, the extraction of bacterioruberin and proteins from Haloferax mediterranei ATCC 33500 was investigated using aqueous solutions of ionic liquids and surfactants, which were further compared with ethanol. Despite the good performance of ethanol in the extraction of bacterioruberin, the use of aqueous solutions of surface-active compounds allowed the simultaneous release of bacterioruberin and proteins in a multi-product process, with the non-ionic surfactants being identified as the most promising. The optimum operational conditions allowed a maximum extraction yield of 0.37 ± 0.01 mgbacterioruberin gwet biomass−1 and 352 ± 9 mgprotein gwet biomass−1 with an aqueous solution of Tween® 20 (at 182.4 mM) as the extraction solvent. In addition, high purities of bacterioruberin were obtained, after performing a simple induced precipitation using ethanol as an antisolvent to recover the proteins present in the initial extract. Finally, a step for polishing the bacterioruberin was performed, to enable solvent recycling, further closing the process to maximize its circularity.

Graphical abstract: Recovery of bacterioruberin and proteins using aqueous solutions of surface-active compounds

Supplementary files

Article information

Article type
Paper
Submitted
22 apr 2022
Accepted
02 okt 2022
First published
24 okt 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 30278-30286

Recovery of bacterioruberin and proteins using aqueous solutions of surface-active compounds

B. M. C. Vaz, M. Kholany, D. C. G. A. Pinto, I. P. E. Macário, T. Veloso, T. Caetano, J. L. Pereira, J. A. P. Coutinho and S. P. M. Ventura, RSC Adv., 2022, 12, 30278 DOI: 10.1039/D2RA02581G

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