Figure 1.

Optical characterization of human platelet concentrates, and the 405-nm light treatment system used for exposure of platelet concentrates. (A) Transmission of human platelet concentrates. Analysis demonstrates the slight variation in optical properties between batches (n = 5). Measured by UV-Vis spectrophotometry using a wavelength scan between 300 and 500 nm. (B) Optical emission spectrum of the 405-nm LED array, measured using a high resolution spectrometer (HR4000 Ocean Optics Inc, Germany) and SpectraSuite software (Version 2.0.151). (C) Model demonstrating the irradiance profile across the area of the platelet bag, with irradiance of ~5 mWcm⁻² at the center (plotted using MATLAB R2012b software).