Abstract
The bacteria Rhodococcus sp. and Xanthobacter autotrophicus have the ability to dehalogenate a broad range of halogenated hydrocarbons. The applicability of spray drying to the preservation of the microorganisms and the intracellular enzyme halidohydrolase (E.C.3.8.1.1) was examined. K2SO4, MgSO4, glutamate and sucrose were added as stabilizers and carriers. Spray drying was carried out at inlet air temperatures of 100–120 °C and outlet air temperatures of 65–72 °C. Best results were obtained by the addition of 5% K2SO4 and at 107 °C air inlet temperature. Dried preparations of Rhodococcus sp. exhibited a crystalline consistency and a 95% recovery of cellular activity. After storage at 4 °C for six months the enzyme preparation showed no loss in activity. Spray dried preparations of Xanthobacter autotrophicus showed only a 4% recovery of cellular activity.
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Abbreviations
- MSG:
-
Monosodiumglutamate
- RC %:
-
Recovery of stabilizer and biomass
- RCA %:
-
Recovery of cellular activity ([U/g biomass after the spraydrying]/[U/g biomass of untreated cells]) ⋆100
- RCB %:
-
Recovery of biomass
- SR %:
-
Survival rate
- T 1 °C:
-
Inlet air temperature
- T 2 °C:
-
Exit air temperature
- W %:
-
Water content
- Y.Akt %:
-
Yield in enzyme activity
References
Corry, J. E. L.: The water relations and heat resistance of microorganisms. Progr. Ind. Microbiol. (1973) 73–108
Elizondo, H.; Labuza, T. P.: Death kinetics of yeast in spray drying. Biotechn. Bioeng. 16 (1974) 1245–1259
Gölker, C.: Drying of biotechnological products. Biotech. Forum 4 (1987) 158–166
Issacs, M. L.: A colorimetric determination of blood chlorides. J. Biol. Chem. 53 (1922) 17–19
Janssen, D. B.; Scheper, A.; Witholt, B.: Biodegradation of 2-chloroethanol by pure bacterial culture. Appl. Environ. Microbiol. 49 (1984) 169–178
Labza, T. P.; Roux, J. P.; Fan, T. S.; Tannenbaum, S. R.: Engineering factors in single-cell protein produktion. II. Spray drying and cell viability. Biotechn. Bioeng 12 (1970) 135–140
Lievence, L. C; van't Riet, K.: Convective drying of bacteria. Adv. Biochem. Eng. Biotechno. Vol. 50 (1993) 45–63
Masters, K.; Vestergaard, I.: Spray drying techniques for byproduct recovery. Process Biochemistry 13 (1), (1978) 3–6
Scholz, R.; Schmuckle, A.; Cook, A. M.; Leisinger, T.: Degradation of eighteen 1-monohaloalkanes by Arthrobacter sp. Strain HA1. Journal of General Microbiology 133 (1987) 267–274
Yamada, N.; Shoga, Y.: Stabilization of enzymes for spraydrying. (1992) Europ. Pat. Appl. EP 501.375
Yoo, B.; Lee, C. M.: Thermoprotective effect of sorbitol on proteins during dehydration; J. Agric. Food Chem. 41 (1993) 190–192
Werner, L.; Latzko, F.; Hampel, W.: Spray drying of yeast-lytic enzymes from Arthrobacter sp.; Biotechnol. Tech. 7 (1993) 9, 663–666
Wolin, E. A.; Wolin, J.; Wolfe, R. S.: Formation of methane by bacterial extracts. J. Biol. Chem. 238 (1956) 2882–2886
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This work was supported by the Jubiläumsfond der Oesterreichischen Nationalbank, Projekt No. 4499.
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Hutter, W., Werner, L., Peter, J. et al. Spray drying of the dehalogenating bacterium Rhodococcus sp.. Bioprocess Engineering 13, 19–21 (1995). https://doi.org/10.1007/BF00368760
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DOI: https://doi.org/10.1007/BF00368760