Porphyrins: Liquid Chromatography
نویسنده
چکیده
bering system). The four pyrrole rings are designated A, B, C and D. The -positions, which are usually substituted with acetic acid (Ac), propionic acid (Pr), methyl (Me), ethyl (Et) and vinyl (V) groups, are numbered 1}8. The four methine bridges or mesopositions are denoted , , and . to a macroporous molecule is fractional but by using very small particle diameters it can be increased somewhat to enable a separation to take place. The small particle size results in an extremely high backpressure, and so column lengths are greatly reduced. In a move away from particles it has become possible to polymerize the monomer/porogen mixture within the column itself, generating the pore structure in much the same way as particles but resulting in a monolith structure } a rigid polymeric cylinder containing through pores as well as diffusive pores. Columns containing such structures are now commercially available.
منابع مشابه
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1. Gray CH, Urn CK, Nicholson DC. The differentiation of the porphyrins by means of high pressure liquid chromatography. Clin Chim Acta 77, 167-178 (1977). 2. Doss M. Analytical and preparative thinlayer chromatography of porphyrin methyl esters. Z Kiln Chem Kiln Biochem 8, 197207 (1970). 3. Straka JG, Kushner, JP, Burnham BF. High-performance liquid chromatography of porphyrin esters. Identifi...
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تاریخ انتشار 2003