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Effect of guard cells electroporation on drying kinetics and aroma compounds of Genovese basil (Ocimum basilicum L.) leaves

Kwao, Stephen ; Alhamimi, Said LU ; Damas, María Elena Vicente; Rasmusson, Allan G. LU and Gómez Galindo, Federico LU (2016) In Innovative Food Science and Emerging Technologies 38. p.15-23
Abstract

In this study the effect of the application of pulsed electric fields as pre-treatment before air drying of basil leaves at 50 °C was investigated. The parameters of the electric treatment were designed in such a way that they either (i) electroporated the tissue reversibly (tissue remains viable) and without electroporating the guard cells in the stomata complex (65 pulses of 600 V/cm, 120 μs pulse width, 500 μs between pulses), (ii) electroporated the tissue reversibly causing the guard cells to irreversibly open the stomata (65 pulses of 600 V/cm, 150 μs pulse width, 760 μs between pulses), or (iii) irreversibly electroporated the tissue leading to cell death (65 pulses of 1500 V/cm, 150 μs pulse width, 760 μs between pulses).... (More)

In this study the effect of the application of pulsed electric fields as pre-treatment before air drying of basil leaves at 50 °C was investigated. The parameters of the electric treatment were designed in such a way that they either (i) electroporated the tissue reversibly (tissue remains viable) and without electroporating the guard cells in the stomata complex (65 pulses of 600 V/cm, 120 μs pulse width, 500 μs between pulses), (ii) electroporated the tissue reversibly causing the guard cells to irreversibly open the stomata (65 pulses of 600 V/cm, 150 μs pulse width, 760 μs between pulses), or (iii) irreversibly electroporated the tissue leading to cell death (65 pulses of 1500 V/cm, 150 μs pulse width, 760 μs between pulses). Results demonstrate that dehydration of basil leaves at 50 °C can be aided by the application of pulsed electric fields (PEF). If the applied PEF conditions are such that stomata are irreversibly opened while the rest of the tissue remains viable, the drying process is faster and the product keeps a better colour, is richer in aroma compounds and has better rehydration capacity than the untreated control. Irreversible tissue damage provoked by high intensity PEF drastically decreased the drying time but the measured quality characteristics of the dried leaves were inferior compared to those of the dried product when the stomatal function of the fresh leaf was selectively targeted. Industrial relevance This paper addresses the ever-increasing global demand from consumers for high-quality foods, reporting a novel methodology which improves the quality of dried aromatic herbs using pulsed electric fields.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Differential electroporation, Enhanced dehydration, Stomata
in
Innovative Food Science and Emerging Technologies
volume
38
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:84986552399
  • wos:000389397100003
ISSN
1466-8564
DOI
10.1016/j.ifset.2016.09.011
language
English
LU publication?
yes
id
3358bfb7-335b-4a90-80a5-69b604510fe1
date added to LUP
2016-10-12 10:07:18
date last changed
2017-09-18 11:31:13
@article{3358bfb7-335b-4a90-80a5-69b604510fe1,
  abstract     = {<p>In this study the effect of the application of pulsed electric fields as pre-treatment before air drying of basil leaves at 50 °C was investigated. The parameters of the electric treatment were designed in such a way that they either (i) electroporated the tissue reversibly (tissue remains viable) and without electroporating the guard cells in the stomata complex (65 pulses of 600 V/cm, 120 μs pulse width, 500 μs between pulses), (ii) electroporated the tissue reversibly causing the guard cells to irreversibly open the stomata (65 pulses of 600 V/cm, 150 μs pulse width, 760 μs between pulses), or (iii) irreversibly electroporated the tissue leading to cell death (65 pulses of 1500 V/cm, 150 μs pulse width, 760 μs between pulses). Results demonstrate that dehydration of basil leaves at 50 °C can be aided by the application of pulsed electric fields (PEF). If the applied PEF conditions are such that stomata are irreversibly opened while the rest of the tissue remains viable, the drying process is faster and the product keeps a better colour, is richer in aroma compounds and has better rehydration capacity than the untreated control. Irreversible tissue damage provoked by high intensity PEF drastically decreased the drying time but the measured quality characteristics of the dried leaves were inferior compared to those of the dried product when the stomatal function of the fresh leaf was selectively targeted. Industrial relevance This paper addresses the ever-increasing global demand from consumers for high-quality foods, reporting a novel methodology which improves the quality of dried aromatic herbs using pulsed electric fields.</p>},
  author       = {Kwao, Stephen  and Alhamimi, Said and Damas, María Elena Vicente and Rasmusson, Allan G. and Gómez Galindo, Federico},
  issn         = {1466-8564},
  keyword      = {Differential electroporation,Enhanced dehydration,Stomata},
  language     = {eng},
  month        = {12},
  pages        = {15--23},
  publisher    = {Elsevier},
  series       = {Innovative Food Science and Emerging Technologies},
  title        = {Effect of guard cells electroporation on drying kinetics and aroma compounds of Genovese basil (Ocimum basilicum L.) leaves},
  url          = {http://dx.doi.org/10.1016/j.ifset.2016.09.011},
  volume       = {38},
  year         = {2016},
}