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A manganese-containing component from the water-extract of Theae folium (green tea) was found to exert an augmentative effect in magnetic resonance imaging (MRI) contrast and may possibly be a manganese(II) complex with a pectin-like polysaccharide capable of shortening the spin-lattice relaxation time (T1) of water protons. Even though only the manganese(II) ion with S = 5/2 is active in T1-shortening ability, which should enhance contrast, complexation of this ion with the polysaccharide causes a marked increase in its activity. This manganese-containing pectin-like polysaccharides should prove useful as a low-toxic oral gastrointestinal contrast material in MRI.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Metal-Containing Components in Medicinal Plants. III. Manganese-Containing Components in Theae Folium as Oral Magnetic Resonance Imaging Contrast Materials.