Validation of the heat treatment step used in the production of diaspirin crosslinked hemoglobin (DCLHb) for viral inactivation.

A series of experiments was performed to assess the ability of the heat treatment step used in the manufacture of diaspirin crosslinked hemoglobin (DCLHb™) to inactivate viruses. In-process solutions (reaction mixtures after the crosslinking process) from six different manufacturing lots were used as test media in a 1:680 scaled down system in which the key process parameters used in the large scale production were duplicated. The inactfvation of five different viruses (Bovine Viral Diarrhea Virus, Pseudorabies Virus, Human Immunodeficiency Virus 1, Porcine Parvovirus and Hepatitis A Virus) was evaluated. Each validation experiment consisted of spiking the solution at 37°C with virus, heating to 74 ± I°C over a period of 30 minutes, holding at 74 ± 1°C for 90 minutes and cooling from 74 ± 1°C to less than 10°C over a period of 30 minutes. Duplicate experiments were performed with each of the viruses with the exception of Human Immunodeficiency Virus 1, for which three experiments were performed. In each e...