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Food Biophysics

, Volume 13, Issue 3, pp 217–225 | Cite as

The Influence of Enzymatic Hydrolysis on Adsorption and Interfacial Dilatational Properties of Pumpkin (Cucurbita pepo) Seed Protein Isolate

  • Sandra Bučko
  • Jaroslav Katona
  • Lidija Petrović
  • Jelena Milinković
  • Ljiljana Spasojević
  • Nenad Mucić
  • Reinhard Miller
ORIGINAL ARTICLE
  • 125 Downloads

Abstract

Pumpkin seed protein isolate, PSPI, was enzymatically hydrolysed by alcalase to obtain pumpkin seed protein hydrolysate, PSPH. Kinetics of PSPI and PSPH adsorption layer formation at oil–protein solution interface and interfacial dilatational properties of the layers were investigated by the drop profile analysis tensiometer (PAT) in order to determine the influence of enzimatic hydrolysis on the interfacial properties of pumpkin seed proteins. The properties were investigated at different protein solution concentrations (0.0008–0.8 g/100 mL), ionic strengths (0–0.5 mol/L NaCl), and at two acidic pH (3 and 5, where PSPI’s pI = 5). It was found that both, PSPI and PSPH, contribute to an increase in the interfacial pressure, π, at the oil–protein solution interface and form the interfacial proteinaceous films. Dilatational elasticity, E’, of the interfacial films was found to be a few times higher than the dilatational viscosity, E”, regardless of the experimental conditions. The obtained diffusion rate and adsorption rate constants, kdiff and kads respectively, were higher for PSPH than for PSPI. kdiff was found to increase as protein concentration was increased, and to decrease as ionic strength was increased, for both PSPI and PSPH. At pI = 5, PSPH showed an increased π and E’, as well as mitigated influence of ionic strength on kads when compared to PSPI.

Keywords

Pumpkin seed protein isolate Cucurbita pepo sp. Enzymatic hydrolysis Oil–water interface Interfacial dilatational rheology Dilatational elasticity 

Notes

Acknowledgements

This work was financed by the Ministry of Education, Science and Technological Development of the Republic of Serbia, Grant No III 46010 and the Provincial Secretariat for Higher Education and Scientific Research of the Autonomous Province of Vojvodina, Grant No 142-451-3680/2017-01/01. It is done within COST CM1101 and MP1106 action framework.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Sandra Bučko
    • 1
  • Jaroslav Katona
    • 1
  • Lidija Petrović
    • 1
  • Jelena Milinković
    • 1
  • Ljiljana Spasojević
    • 1
  • Nenad Mucić
    • 2
  • Reinhard Miller
    • 2
  1. 1.Faculty of Technology Novi SadUniversity of Novi SadNovi SadSerbia
  2. 2.Max Planck Institute of Colloids and InterfacesPotsdam–GolmGermany

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