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Blueberries, black currant and sea buckthorn berries cell disintegration depending on PEF parameters

STSM by Nerijus Lamanauskas, Early-Stage Researcher

Period of mission: from 04/03/2013 to 17/03/2013

Home institution: Vytautas Magnus University, Kaunas, Lithuania

Host institution: ProdAl S.c.a.r.l. & University of Salerno, Fisciano, Italy

Pulsed electric field (PEF) is used to improve extraction of bioactive molecules, such as antioxidants, colorants, flavours and others (Donsi et al., LWT - Food Science and Technology, 2010). Many investigations are carried out with grapes, but much less work is done on other types of berries. Thus the aim of STSM was to investigate cell disintegration of frozen/thawed blueberries, black currant and sea buckthorn berries under different PEF conditions. Complex impedance Z and phase angle were measured and cell disintegration index Zp was calculated. PEF experiments were carried out at 1-5 kV/cm electric field strenght, 1-10 kJ/kg total electric energy, 20 μs pulse width and 20 Hz frequency. Zp values were similar for blueberries and sea buckthorn. Zp depended more on electric field, and not so much on total electric energy. Therefore, 5 kV/cm and 1 kJ/kg were found as optimal conditions. Under these PEF conditions, Zp = 0.49 for blueberries, Zp = 0.58 for sea buckthorn and Zp = 0.29 for black currant was found. In conclusion, with the same PEF parameters applied, cell disintegration was similar for blueberries and sea buckthorn, maximal Zp = 0.5-0.6. Black currant berries were less affected by the same parameters, maximal Zp = 0.29. It should be also stressed, that all the berries used in this work were frozen/thawed and this can explain the low increase of Zp value detected. It can be expected that the application of PEF pre-treatment to fresh products will guarantee a greater increase of cell membrane permeabilization.

This report is also featured in the July 2013 newsletter available here.

Publication(s) originating from this mission

Journal Zemdirbyste-Agriculture
Impact Factor (according to ISI Thomson) 0,470
Authors Lamanauskas Nerijus, Bobinaite Ramune, Satkauskas Saulius, Viskelis Pranas, Pataro Gianpiero, Ferrari Giovanna
Title Pulsed Electric Field-Assisted Juice Extraction of frozen/thawed blueberries
Year 2015
Issue 102 (1)
Pages 59-66
Status Published

 

Journal Innovative Food Science and Emerging Technologies - Special Issue
Impact Factor (according to ISI Thomson) 3,273
Authors R. Bobinaitė , G. Pataro , N. Lamanauskas, S. Šatkauskas, P. Viškelis , G. Ferrari Giovanna
Title Pulsed electric field-assisted pressing and extraction of juice and bioactive compounds from blueberry fruits and their by-products
Year 2014
Issue ?
Pages ?
Status Unknown - to be updated

Oral presentation(s) originating from this mission

Event School on applications of Pulsed Electric Fields for food processing
Location Fisciano/Italy
Period 07/02 - 12/02/2015
Authors N. Lamanauskas, R. Bobinaite, S. Satkauskas, G. Pataro, G. Ferrari
Title PEF application for cell disintegration of Black Currant and Sea Buckthorn berries

 


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