PDE4 inhibition is achieved by novel nitroxide compounds, e. The invention further provides an apparatus for treating a surface of at least one substrate, wherein the apparatus is provided with a process chamber and at least one plasma source, wherein the at least one plasma source andor at least one optionally provided treatment fluid supply source is movably arranged. The device is placed in the bottom of a food container and facilitates the draining of fluids through the holes thereon, thereby preventing any fruit or food products contained therein from spoiling or becoming overly saturated with fluid.