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Sterilization of Exopolysaccharides Produced by Deep-Sea Bacteria: Impact on Their Stability and Degradation
Laboratory of Biotechnology and Marine Molecules, French Research Institute for Exploitation of the Sea (IFREMER), Rue de l’Ile d’Yeu, BP 21105, 44311 Nantes Cedex 03, France
INSERM UMRS 791, Laboratory of Osteo-Articular and Dental Tissue Engineering, School of Dental Surgery, University of Nantes, 1 Place Alexis Ricordeau, 44042 Nantes Cedex 1, France
* Author to whom correspondence should be addressed.
Received: 23 December 2010; in revised form: 21 January 2011 / Accepted: 7 February 2011 / Published: 10 February 2011
Abstract: Polysaccharides are highly heat-sensitive macromolecules, so high temperature treatments are greatly destructive and cause considerable damage, such as a great decrease in both viscosity and molecular weight of the polymer. The technical feasibility of the production of exopolysaccharides by deep-sea bacteria Vibrio diabolicus and Alteromonas infernus was previously demonstrated using a bioproduct manufacturing process. The objective of this study was to determine which sterilization method, other than heat sterilization, was the most appropriate for these marine exopolysaccharides and was in accordance with bioprocess engineering requirements. Chemical sterilization using low-temperature ethylene oxide and a mixture of ionized gases (plasmas) was compared to the sterilization methods using gamma and beta radiations. The changes to both the physical and chemical properties of the sterilized exopolysaccharides were analyzed. The use of ethylene oxide can be recommended for the sterilization of polysaccharides as a weak effect on both rheological and structural properties was observed. This low-temperature gas sterilizing process is very efficient, giving a good Sterility Assurance Level (SAL), and is also well suited to large-scale compound manufacturing in the pharmaceutical industry.
Keywords: marine biotechnology; polysaccharides; sterilization procedures; characterization; molecular weight distribution; rheology
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Rederstorff, E.; Fatimi, A.; Sinquin, C.; Ratiskol, J.; Merceron, C.; Vinatier, C.; Weiss, P.; Colliec-Jouault, S. Sterilization of Exopolysaccharides Produced by Deep-Sea Bacteria: Impact on Their Stability and Degradation. Mar. Drugs 2011, 9, 224-241.
Rederstorff E, Fatimi A, Sinquin C, Ratiskol J, Merceron C, Vinatier C, Weiss P, Colliec-Jouault S. Sterilization of Exopolysaccharides Produced by Deep-Sea Bacteria: Impact on Their Stability and Degradation. Marine Drugs. 2011; 9(2):224-241.
Rederstorff, Emilie; Fatimi, Ahmed; Sinquin, Corinne; Ratiskol, Jacqueline; Merceron, Christophe; Vinatier, Claire; Weiss, Pierre; Colliec-Jouault, Sylvia. 2011. "Sterilization of Exopolysaccharides Produced by Deep-Sea Bacteria: Impact on Their Stability and Degradation." Mar. Drugs 9, no. 2: 224-241.