SPECIFIC EFFECTS IN THE INTERACTION BETWEEN ION-EXCHANGE RESINS AND AMINO ACID CATIONS. INFLUENCE OF RESIN CROSS-LINKAGE

1963 ◽  
Vol 67 (12) ◽  
pp. 2544-2547 ◽  
Author(s):  
Jehuda Feitelson
Keyword(s):  
Amino Acid ◽  
Ion Exchange ◽  
Ion Exchange Resins ◽  
Specific Effects ◽  
Cross Linkage ◽  
Exchange Resins

Ion-exchange Resins and Polypeptide Supported Catalysts: A Critical Review

2020 ◽  
Vol 7 (1) ◽  
pp. 40-52 ◽  
Author(s):  
Kinkar Biswas ◽  
Sujit Ghosh ◽  
Basudeb Basu
Keyword(s):  
Amino Acid ◽  
Ion Exchange ◽  
Supported Catalysts ◽  
Ion Exchange Resins ◽  
Organic Transformations ◽  
Heterogeneous Polymer ◽  
Different Types ◽  
Polystyrene Resin ◽  
Polymer Supported ◽  
Exchange Resins

Heterogeneous catalysis represents one of the important areas in the field of organic synthesis. Major developments have been emerged during last few decades and polymer-supported catalysts have been employed successfully in various catalytic organic transformations. Ion-exchange resins and polypeptides are two important examples of such heterogeneous polymer-supported catalysts among others because of their easy accessibility, stability, recoverability and reusability. Cross-linked ion-exchange resins and polypeptides are highly insoluble, which make them better choice in terms of their easy separation from the reaction mixture and subsequent recyclability. The present review article provides an overview of different types of ion exchange resins as polymer-supported catalysts such as amberlite resin, polystyrene resin, polyionic gel-based systems, ion-exchange resins and prolineimmobilized species, PEG-bound poly (amino acid), amino acid anchored with Merrifild resin, amphiphilic block polypeptides etc. Their preparation, characterizations and catalytic applications in diverse organic transformations have been presented with critical analysis on their stability, mechanistic overview and suitability etc.

The Amino Acid Composition of Cod Tropomyosin

1961 ◽  
Vol 18 (4) ◽  
pp. 501-512 ◽  
Author(s):  
P. L. Hoogland ◽  
H. C. Freeman ◽  
Beryl Truscott ◽  
A. E. Waddell
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Ion Exchange ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Ion Exchange Resins ◽  
Probable Number ◽  
Similarities And Differences ◽  
Exchange Resins

The amino acid composition of cod tropomyosin was determined. Most analyses were done by chromatography on columns of ion-exchange resins (Moore and Stein technique); tryptophan and cystine were determined chemically.The results are compared with published values for tropomyosins from other sources. Similarities and differences between the various tropomyosins are discussed. The probable number of residues of each of the amino acids in the tropomyosin molecule is calculated.

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