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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Appl+Microbiol 2014 ; 117 (6): 1810-9 Nephropedia Template TP
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The influence of stabilizers and rates of freezing on preserving of structurally different animal viruses during lyophilization and subsequent storage #MMPMID25250638
Malenovska H
J Appl Microbiol 2014[Dec]; 117 (6): 1810-9 PMID25250638show ga
AIMS: To make a comparative evaluation of the effects of different stabilizers and freezing rates on structurally different viruses during lyophilization and storage. METHODS AND RESULTS: Two virus strains from each of six animal virus families, including both enveloped and nonenveloped viruses, were lyophilized in (i) culture medium, (ii) with the addition of gelatine-sucrose and (iii) skim milk-sodium glutamate. All the virus suspensions were frozen (i) at -80 degrees C or (ii) in liquid nitrogen before lyophilization. Virus titre assay after lyophilization and after 8 months storage at 4 degrees C revealed that the efficacy of stabilizers depended on virus structure. Generally, the best protective quality for enveloped viruses was achieved with gelatine-sucrose, which best maintained their infectivity and envelope morphology. Even additive-free culture medium proved adequate for nonenveloped viruses. Differences in stabilizer efficacy were also found between virus families and were expressed immediately after lyophilization; the activity of stabilizers in the course of storage was very similar. Freezing in liquid nitrogen proved beneficial for picornaviruses. CONCLUSIONS: The choice of an appropriate stabilizer with respect to virus type is crucial for effective lyophilization. SIGNIFICANCE AND IMPACT OF THE STUDY: This study contributes to the establishment of general guidelines for animal virus lyophilization, with particular respect to differences in virus structure.