Commercial carrier ampholytes, obtained by coupling polyethylene polyamines to acrylic acid, exhibit a conductivity minimum in the pH range 5.5-6.5 owing to the lack of appropriate pK values of the polyamine in this pH region. By replacing acrylic with itaconic acid, it has been possible to effect substantial improvements in the pH range 5.5-6.5 as itaconic acid has a pK2 value of 5.45. Upon coupling, the pK of the gramma-carboxyl group remains virtually unaltered. With itoconic acid carrier ampholytes it has been possible to improve the conductivity in the pH range 5.5-6.5 by as much as 400% compared with conventional carrier ampholytes. It is suggected that the commercial products should be supplemented with itaconic acid carrier ampholytes in order to obtain a more uniform conductivity and buffering capacity in the pH range 3-10.

Itaconic acid carrier ampholytes for isoelectric focusing / P.G. Righetti, L. Balzarini, E. Gianazza, O.V. Brenna. - In: JOURNAL OF CHROMATOGRAPHY A. - ISSN 0021-9673. - 134:2(1977 Apr 11), pp. 279-284. [10.1016/S0021-9673(00)88524-6]

Itaconic acid carrier ampholytes for isoelectric focusing

E. Gianazza
Penultimo
;
O.V. Brenna
Ultimo
1977

Abstract

Commercial carrier ampholytes, obtained by coupling polyethylene polyamines to acrylic acid, exhibit a conductivity minimum in the pH range 5.5-6.5 owing to the lack of appropriate pK values of the polyamine in this pH region. By replacing acrylic with itaconic acid, it has been possible to effect substantial improvements in the pH range 5.5-6.5 as itaconic acid has a pK2 value of 5.45. Upon coupling, the pK of the gramma-carboxyl group remains virtually unaltered. With itoconic acid carrier ampholytes it has been possible to improve the conductivity in the pH range 5.5-6.5 by as much as 400% compared with conventional carrier ampholytes. It is suggected that the commercial products should be supplemented with itaconic acid carrier ampholytes in order to obtain a more uniform conductivity and buffering capacity in the pH range 3-10.
Polyamines ; Hydrogen-Ion Concentration ; Buffers ; Succinates ; Isoelectric Focusing
Settore BIO/10 - Biochimica
11-apr-1977
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/176111
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