Zeta potential and nanoparticle size were determined on film forming solutions of native and heat-denatured proteins of bitter vetch as a function of pH and of different concentrations of the polyamines spermidine and spermine, both in the absence and presence of the plasticizer glycerol. Our results showed that both polyamines decreased the negative zeta potential of all samples under pH 8.0 as a consequence of their ionic interaction with proteins. At the same time, they enhanced the dimension of nanoparticles under pH 8.0 as a result of macromolecular aggregations. By using native protein solutions, handleable films were obtained only from samples containing either a minimum of 33 mM glycerol or 4 mM spermidine, or both compounds together at lower glycerol concentrations. However, 2 mM spermidine was sufficient to obtain handleable film by using heat-treated samples without glycerol. Conversely, brittle materials were obtained by spermine alone, thus indicating that only spermidine was able to act as an ionic plasticizer. Lastly, both polyamines, mainly spermine, were found able to act as “glycerol-like” plasticizers at concentrations higher than 5 mM under experimental conditions at which their amino groups are undissociated. Our findings open new perspectives in obtaining protein-based films by using aliphatic polycations as components

Plasticizing Effects of Polyamines in Protein-Based Films / Sabbah, Mohammed; DI PIERRO, Prospero; Giosafatto, CONCETTA VALERIA LUCIA; Esposito, Marilena; Mariniello, Loredana; Regalado, Gonzales; Carlos, ; Porta, Raffaele. - In: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES. - ISSN 1661-6596. - 18:(2017), pp. 1026-1035. [10.3390/ijms18051026]

Plasticizing Effects of Polyamines in Protein-Based Films

DI PIERRO, PROSPERO;GIOSAFATTO, CONCETTA VALERIA LUCIA;ESPOSITO, MARILENA;MARINIELLO, LOREDANA;PORTA, RAFFAELE
2017

Abstract

Zeta potential and nanoparticle size were determined on film forming solutions of native and heat-denatured proteins of bitter vetch as a function of pH and of different concentrations of the polyamines spermidine and spermine, both in the absence and presence of the plasticizer glycerol. Our results showed that both polyamines decreased the negative zeta potential of all samples under pH 8.0 as a consequence of their ionic interaction with proteins. At the same time, they enhanced the dimension of nanoparticles under pH 8.0 as a result of macromolecular aggregations. By using native protein solutions, handleable films were obtained only from samples containing either a minimum of 33 mM glycerol or 4 mM spermidine, or both compounds together at lower glycerol concentrations. However, 2 mM spermidine was sufficient to obtain handleable film by using heat-treated samples without glycerol. Conversely, brittle materials were obtained by spermine alone, thus indicating that only spermidine was able to act as an ionic plasticizer. Lastly, both polyamines, mainly spermine, were found able to act as “glycerol-like” plasticizers at concentrations higher than 5 mM under experimental conditions at which their amino groups are undissociated. Our findings open new perspectives in obtaining protein-based films by using aliphatic polycations as components
2017
Plasticizing Effects of Polyamines in Protein-Based Films / Sabbah, Mohammed; DI PIERRO, Prospero; Giosafatto, CONCETTA VALERIA LUCIA; Esposito, Marilena; Mariniello, Loredana; Regalado, Gonzales; Carlos, ; Porta, Raffaele. - In: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES. - ISSN 1661-6596. - 18:(2017), pp. 1026-1035. [10.3390/ijms18051026]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/672306
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