Related Experiment Video
Updated: Jul 18, 2026

Alternative In Vitro Methods for the Determination of Viral Capsid Structural Integrity
Published on: November 16, 2017
Effect of manufacturing process parameters on virus inactivation by dry heat treatment at 80 degrees C in factor VIII
P L Roberts1, C Dunkerley, A McAuley
1Bio Products Laboratory, Elstree, Herts, UK. peter.roberts@bpl.co.uk
Background And Objectives:
Dry heat treatment at 80 degrees C for 72 h is used as a virus inactivation step for some coagulation factor concentrates such as Bio Products Laboratory's (BPL) factor VIII 8Y. In the current study, the effect of this process has been tested on a range of viruses. In addition the effect of various manufacturing process parameters on virus inactivation has been investigated.
Materials And Methods:
Samples of product intermediate were obtained from manufacturing, spiked with virus and subjected to freeze drying and dry heat treatment. Virus inactivation was determined by infectivity assay.
Results:
Freeze drying followed by dry heat treatment was effective for inactivating a wide range of enveloped and nonenveloped viruses. Sucrose or protein concentration had no effect on virus inactivation. Product presentation or the interruption of heat treatment also had no effect. The inactivation of some of the viruses was greater at higher residual water content but under such conditions the stability of the product was reduced.
Conclusion:
This virus inactivation step was effective for a wide range of viruses and over the range of process conditions encountered in manufacturing. This demonstrates the robustness of this process step.
Related Concept Videos
Physical Methods for Controlling Microbial Growth: Temperature
Methods of Sterilization I: Physical Methods
Steam sterilization uses non-toxic, low-cost moist heat in the form of saturated steam under pressure, which is fast, microbicidal, and sporicidal, and quickly warms and penetrates fabrics. Autoclaves, or steam sterilizers, expose each item to direct steam contact for a predetermined time at the necessary...
Methods of Sterilization II: Chemical Methods
Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...
Pasteurization and Food Preservation

