Anionic ion exchange

The DNP derivative, prepared from 2,4-dinitrofluorobenzene is released from the nitrogen with an anionic ion exchange resin." When used for histidine protection, the DNP group has been observed to migrate to nearby [ysine residues during Fmoc cleavage. ... 

Puma, P., Duffey, D., and Dawidczyk, P., U.S. Patent appl. 94,944, Purification of oligodeoxyribonucleotide phosphorothioates using DEAE-5PW anion ion-exchange chromatography and hydrophobic interaction chromatography, 1994. 

The solvent sublation procedure of Wickbold [18] is another method that has been used for the analysis of LAS present in seawater [19,20], The solvent sublation technique (gaseous stripping into organic solvent, often ethyl acetate) has also been used to isolate and concentrate nonionic surfactants, e.g. AEs and APEO in aqueous samples [21,22], The co-extracted interferences can be eliminated by cation/anion ion-exchange and alumina chromatography [23,24]. 

Only one basic design of electrodialysis equipment for demineralization appears to be in use. This is an assembly of alternate cation and anion ion exchange sheets separated by spacers in groups of several hundred clamped together between electrodes. The assembly physically resembles a plate-and-frame filter press. Figures 15.21(a) and (b) show such assemblies, and some dimensional data were stated in Section 15.5, Electrodialysis. 

A more recent process, i.e., acid reduction by anionic ion exchange, was developed at the Research and Development Laboratories of The Coca-Cola Company Foods Division in Plymouth, Florida. 

Removal of citrate ion by an anionic ion-exchange process can be accomplished by exchange with hydroxyl ion and the subsequent formation of water, which is a component of juice and which can be removed by evaporation hence, it should be preferable to a method that relies on the addition of a neutralizing substance to a citrus juice. The ion-exchange process is illustrated in the following equation ... 

Cataionic and anionic ion-exchange resins (50) were used as stationary phases for the separation of several analgesic drugs including salicylamide using aqueous ethanol as the mobile phase. 

Fig. 50 Synthesis of cyclic polyester using anionic ion-exchange resin...

Shibasaki-Kitakawa, N., Honda, H., Kuribayashi, H., Toda, T., Fukumura, T., and Yonemoto, T. 2007. Biodiesel production using anionic ion-exchange resin as heterogeneous catalyst. Bioresour. Technol., 98, 416 21. 

Scott W., and Furman, N. H. (ed.). 1961. Scott s Standard Methods of Chemical Analysis (5th ed., vol. 1, pg. 604). Princeton, NJ D. Van Nostrand Company Inc. Shibasaki-Kitakawa, N., Honda, H., Kuribayashi, H., Toda, T., Fukumura, T., and Yonemoto, T. 2007. Biodiesel production using anionic ion-exchange resin as heterogeneous catalyst. Bioresour. Technol., 98(2), 416-421. 

Shao Tong, Interactions of Carboxylic Acids, Amino Acids and Oxidized Glutathione with Anion Ion Exchanger, M.S. thesis, Lanzhou University, 1990. 

In Japan another process is used in which the iodine formed by chlorine oxidation is absorbed as polyiodide on an anionic ion exchanger. Desorption with alkali yields concentrated iodide- and iodate-containing solutions which are worked up to elemental iodine. 

DEAE-cellulose. (diethylaminoethyl cellulose). A cellulose ether containing the group (C2H5)2NCH2CH2 bound to the cellulose in an ether linkage. An anionic ion-exchange material. 

On the other hand, monoglycerides can be obtained selectively from the reaction of glycidol with fatty acids over an anionic ion-exchange resin (17). 

A/ A -Dimethyl-p-phenylenediamine (30) has been attached to nucleotides to form basic phosphoramidates. These have been polymerized and the products purified by using a cationic rather than an anionic ion-exchange... 

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