CONCLUSIONS Methylene blue photochemical methods can be used to inactivate the main transfusion infected viruses, and the normal activities of plasma still keep at very high level.

Objective to investigate the change of the insulin degrading enzyme activity of erythrocytes (EIDEA) in patients with chronic hepatitis b, and to reveal the ability of the liver for degrading insulin.

If surface-active substances are used for sample preparation, their absence of toxicity for micro-organisms and their compatibility with inactivators used must be demonstrated.