Abstract

Nuclear magnetic resonance (NMR) is a spectroscopic and imaging technique used in chemistry, physics, biology, medicine, agriculture and in food, biotechnology, pharmaceutical, petroleum and polymer science and technology. The application of NMR can be divided in three great areas: magnetic resonance imaging (MRI) that is widely used in medical diagnostic, highresolution NMR spectroscopy (HR-NMR) that is a powerful method to determine structure and dynamic from small molecules to large molecules, such as proteins and nuclei acids. Both MRI and HR-NMR are based on heavy, bulk and high field superconducting magnets and the instruments are expensive and have to be installed in a controlled environment. The third class of NMR instruments is known as low field NMR or low-resolution NMR or more precise time domain NMR (TD-NMR).