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EPR on Medically Relevant NO Adsorbed to Zn-LTA

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C. Pal, P. S. Wheatley, H. El. Mkami, D. J. Keeble, R. E. Morris, Olav Schiemann

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For medical purposes, materials are required that store and target specifically deliver exogenous nitric oxide (NO). Partially zinc-exchanged Na-LTA (Linde type A) zeolite (Zn-LTA) has high potential in this respect due to its non-toxicity and adsorption capacity for NO. In contrast to NO adsorbed to LTA zeolites prepared for catalytic purposes, lower dehydration temperature prior to NO adsorption is used to achieve a balance between production cost and high activity. In order to study the interaction of NO with the metal sites in the samples prepared under these medical conditions, continuous-wave X-band electron paramagnetic resonance has been applied. In contrast to Na-LTA with only one weakly interacting NO monomer, three different monomers, having stronger interaction to the metal sites than in Na-LTA, were observed in Zn-LTA. To improve the storage capacity of Zn-LTA, higher dehydration temperatures would be necessary.



Original languageEnglish
Pages (from-to)619-627
Number of pages9
JournalApplied Magnetic Resonance
Issue number1-4
Publication statusPublished - Jan 2010

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