Abstract
Extracorporeal photochemotherapy (photopheresis, ECP) is a novel therapeutic method for patients who do not respond to immunosuppressive medications, and gaining interest in the treatment of Graft-vs-Host Disease. This paper is focused on the optical transmission properties of plastic bags which can be used in an independent (off-line) method of ECP, and reports the results of spectral measurements on various bags of different chemical compositions, with and without PUVA treatment. Regarding their higher and more uniform UVA transmission values, FEP based bags perform superior to the others. Considering its UVB absorption and UVA transmission properties, the EVA bag is a good choice, while Polyimide Kapton–FEP plastic film should not be considered for use in ECP. PUVA treatment of blood bags may affect their optical behaviour, and causes reduction of transmission of the material in UV range of the spectrum.
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