PuSH - Publication Server of Helmholtz Zentrum München: Factors determining microbial colonization of liquid nitrogen storage tanks used for archiving biological samples.

Navigation

Home

Deutsch

Research

Advanced Search

Browse by ...

... Journal

... Publication Type

... Research Data

... Publication Year

Publication overview

Support & Contact

Contact persons

Help

Data protection

Bajerski, F.* ; Bürger, A. ; Glasmacher, B.* ; Keller, E.R.J.* ; Müller, K.* ; Mühldorfer, K.* ; Nagel, M.* ; Rüdel, H.* ; Müller, T.* ; Schenkel, J.* ; Overmann, J.*

Factors determining microbial colonization of liquid nitrogen storage tanks used for archiving biological samples.

Appl. Microbiol. Biotechnol. 104, 131-144 (2020)

Publ. Version/Full Text

Research data

DOI

PMC

	Open Access Gold (Paid Option)

Abstract
Metrics
Extra information

The availability of bioresources is a precondition for life science research, medical applications, and diagnostics, but requires a dedicated quality management to guarantee reliable and safe storage. Anecdotal reports of bacterial isolates and sample contamination indicate that organisms may persist in liquid nitrogen (LN) storage tanks. To evaluate the safety status of cryocollections, we systematically screened organisms in the LN phase and in ice layers covering inner surfaces of storage tanks maintained in different biobanking facilities. We applied a culture-independent approach combining cell detection by epifluorescence microscopy with the amplification of group-specific marker genes and high-throughput sequencing of bacterial ribosomal genes. In the LN phase, neither cells nor bacterial 16S rRNA gene copy numbers were detectable (detection limit, 10(2) cells per ml, 10(3) gene copies per ml). In several cases, small numbers of bacteria of up to 10(4) cells per ml and up to 10(6) gene copies per ml, as well as Mycoplasma, or fungi were detected in the ice phase formed underneath the lids or accumulated at the bottom. The bacteria most likely originated from the stored materials themselves (Elizabethingia, Janthibacterium), the technical environment (Pseudomonas, Acinetobacter, Methylobacterium), or the human microbiome (Bacteroides, Streptococcus, Staphylococcus). In single cases, bacteria, Mycoplasma, fungi, and human cells were detected in the debris at the bottom of the storage tanks. In conclusion, the limited microbial load of the ice phase and in the debris of storage tanks can be effectively avoided by minimizing ice formation and by employing hermetically sealed sample containers.

Altmetric

Additional Metrics?

[➜Log in]

Edit extra informations Login

Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Biobanking ; Microbial Contamination ; Cryobank ; Cryopreservation ; Risk/quality Management ; Safe Storage ; Amplicon Sequencing; Complete Genome Sequence; Sp-nov.; Contamination; Cryopreservation; Embryos; Methylobacterium; Future; Silva

ISSN (print) / ISBN 0175-7598

e-ISSN 1432-0614

Journal Applied Microbiology and Biotechnology

Quellenangaben Volume: 104, Issue: 1, Pages: 131-144

Publisher Springer

Publishing Place 233 Spring St, New York, Ny 10013 Usa

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Developmental Genetics (IDG)