145
Thermo Fisher Scientifi c
Operation Manual HM550
tion media, ermo Fisher Scientifi c Microm International GmbH as-
sumes no liability concerning functionality and disinfection eff ectiveness.
Apendix B
Appendix B
Certfi cate
Microm International GmbH
Mr Benjamin Hoffmann
Robert-Bosch-Straße 49
69190 Walldorf
Germany
CERTIFICATE
Inactivation of bacteria and other pathogens
by cold disinfection in the cryostat Microm HM550
1. Summary
The cold disinfection procedure in the cryostat Microm HM550 involves fogging of a chemical
disinfectant throughout the working space of the cryostat at temperatures down to -20 °C.
The efficacy of microbial inactivation was determined in analogy to the standard methods of the
DGHM (German Society for Hygiene and Microbiology) [1] and the European standard EN
13697:2002-01 [2] for quantitative non-porous surface testing for the evaluation of chemical
disinfectants with adaptations to the test item. The instrument temperature during the tests was
set to -20 °C.
“Sanosil® S010 spezial” (SANOSIL Service GmbH, Farchant, Germany) containing
approximately 5 % hydrogen peroxide and 50 mg/L silver nitrate was used as a disinfectant.
By employing a 15 min fogging period (corresponding to 54 g Sanosil®) followed by an
additional 35 min contact time, a 99.5 to 99.999 % destruction of vegetative test bacteria was
demonstrated. The yeast
Candida albicans
was inactivated by 99.98 %.
Deposition of silver from the disinfectant onto the working space surfaces has an additional long-
term bacteriostatic effect [3].
The cold disinfection procedure thus offers a safe and convenient way to significantly reduce
microbial contamination in the cryostat working space and, therefore, infection risk.
However, the cold disinfection system cannot replace the safety precautions, regular cleaning
and disinfection of the cryostat chamber according to the manufacturer´s instructions.
17 December 2010
Ingo Maier, PhD
eco
scope
does not accept any responsibility for misleading citations due to incomplete
reproduction of this certificate. The certificate is valid only for the tested instrument type and the
testing conditions.
Hochgratweg 12
D-88279 Amtzell
Geschäftsführer:
Dr. Ingo Maier
USt-IdNr. DE223096760
FA Wangen
St.-Nr. 91306/20667
Kreissparkasse Ravensburg
Kto. 292 485 BLZ 650 501 10
IBAN DE19 65050110 0000292485
BIC SOLADES1RVB
Postbank München
Kto. 639 381 801 BLZ 700 100 80
IBAN DE54 70010080 0639381801
BIC PBNKDEFF
Labor für Mikrobiologie und Ökotoxikologie
Priv. Doz. Dr. Ingo Maier
Hochgratweg 12
D-88779 Amtzell, Germany
Tel +49 (0)7520 953 660
Fax +49 (0)7520 953 661
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