Food Biophysics

, Volume 4, Issue 3, pp 191–198

Effect of a Pulsed Electric Field Treatment on Expression Behavior and Juice Quality of Chardonnay Grape

Authors

    • Département de Génie Chimique, Unité Transformations Intégrées de la Matière Renouvelable, Centre de Recherche de RoyallieuUniversité de Technologie de Compiègne
  • Nikolai I. Lebovka
    • Département de Génie Chimique, Unité Transformations Intégrées de la Matière Renouvelable, Centre de Recherche de RoyallieuUniversité de Technologie de Compiègne
    • Institute of Biocolloidal Chemistry named after F.D. OvcharenkoNAS of Ukraine
  • Eugene Vorobiev
    • Département de Génie Chimique, Unité Transformations Intégrées de la Matière Renouvelable, Centre de Recherche de RoyallieuUniversité de Technologie de Compiègne
  • Jean Vaxelaire
    • Energétique et Procédés, ENSGTIUniversité de Pau et des Pays de l’Adour- Laboratoire de Thermique
Original Article

DOI: 10.1007/s11483-009-9117-8

Cite this article as:
Grimi, N., Lebovka, N.I., Vorobiev, E. et al. Food Biophysics (2009) 4: 191. doi:10.1007/s11483-009-9117-8

Abstract

This work discusses the effects of pulsed electric field (PEF) application on low-pressure mechanical expression (the pressure maximum was 1 bar) and characteristics of juice produced from Chardonnay white grape. The experiments were carried out using a texture analyzer equipped with a PEF-treatment compression chamber operated at moderate electric field strength E = 400 V/cm. Two regimes of extraction were compared: expression at constant pressure (0.5 or 1 bar) and expression at progressive pressure increase (from 0 to 1 bar). This last one was chosen for the scale-down modeling of industrial grape pressing process. It was shown that PEF treatment at the electric field E = 400 V/cm and the total time of treatment tPEF ≈ 0.1 s allowed reaching of a high level of cell disintegration, Z ≈ 0.8. The energy consumption of PEF treatment corresponding to this level of disintegration was rather low and equal to W ≈ 15 kJ/kg. The PEF pretreatment resulted in juice yield increase from 67% to 75% (1 h of pressing at constant pressure of 1.0 bar). PEF treatment accelerated development of grape deformation. Decrease of difference between deformations of untreated and PEF-treated samples at high pressure and long-pressing time was observed. Statistical analysis showed no significant effect of PEF treatment on turbidity and content of polyphenols for the constant pressure regime. However, PEF treatment application resulted in elevation of the content of polyphenols (more than 15%) for the progressive pressure-increase regime.

Keywords

White grapesPulsed electric fieldsExpression kineticsTurbidityEnergy consumptionPhenolic compounds

Copyright information

© Springer Science+Business Media, LLC 2009