995% pure; enriched to 83% 129Xe; Nova Gas Technologies,
Charleston, SC, USA), and N2 (99.999% pure; Air Liquide, Coleshill, UK). To ensure the quality of the SEOP cell at least four polarization measurements of a standard mixture (5% Xe–95% N2 or 25% Kr–75% N2 for xenon or krypton experiments respectively) were acquired using an SEOP cell pressure of 230 ± 20 kPa before starting experiments. If a polarization of less than 40% is observed for Xe or 3.5% for Kr then the SEOP cell is replaced. To verify the SEOP cell performance and attempt to prevent Epacadostat molecular weight polarization fluctuations from affecting the observed functional relationship, polarization values at high SEOP cell pressure are taken at least four times at irregular intervals during the experiment. For Extraction Scheme 1, a pressure chamber was constructed from an acrylic tube (length: 200 mm, inner diameter: 100 mm). As shown in Fig. 2b, a latex balloon was placed inside the pressure chamber and was connected to an acrylic screw cap that sealed the body of the chamber (vacuum tested to 0.1 kPa, pressure tested to 300 kPa). The internal volume of the balloon was connected to valve (A) through the screw cap via a small channel with minimized
internal volume. For Extraction Scheme 2, a large volume piston pump unit was constructed from FK228 mw an acrylic tube (length: 450 mm, inner diameter: 58 mm, outer diameter: 70 mm) with acrylic screw caps attached to the tubing and that were each fitted with an O-ring that sealed the device (vacuum tested to 0.1 kPa, pressure tested to 300 kPa). The extraction unit was encompassed by a solenoid coil that produced a static magnetic field of B0 = 0.005 T that aimed to reduce the relaxation of the hp 83Kr inside the extraction unit [36]. The extraction unit needed Gemcitabine solubility dmso to attain vacuum conditions of less than 0.2 kPa prior to hp gas extraction from the SEOP cell and then compress the extracted hp gas to ambient pressure. An O-ring seal equipped acrylic piston provided gas tight isolation of the two compartments
of the extraction unit. The length of the piston was 150 mm to provide proper alignment but its particular shape, shown in Fig. 3a, reduced its weight to minimize its inertia. Extraction Scheme 2 required multiple steps as described in Fig. 3b–e. Initially the piston was retracted by pressurizing Vext with N2 while simultaneously pulling a vacuum on the back of the piston ( Fig. 3b). With the piston in its retracted position, the extraction volume of the unit was Vextmax=790cm3 and this volume was evacuated to below 0.2 kPa ( Fig. 3c). VextVext is subsequently opened to the SEOP cell to allow for gas transfer from the SEOP cell ( Fig. 3d). After 5 s, a pressure of approximately 6–13 kPa was reached (depending on the SEOP pressure), however the pressure equalization was only about 80% complete, allowing for a transfer of approximately 3/4 of the hp gas from the SEOP cell.
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