The present invention is directed to size-stabilized drug nanoparticulate compositions and methods of preparation thereof. Introspection of a guest memory having a guest memory layout is performed. An olefin production process of the invention includes reacting a ketone and hydrogen at a reaction temperature in the range of 50 to 300\xb0 C. All of the parts are protected against heat with heat resistant material 65. Polymers stabilized in accordance with the invention are notable in particular for improved initial color and also for improved color maintenance.