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Effect of reversible permeabilization in combination with different drying methods on the structure and sensorial quality of dried basil (Ocimum basilicum L.) leaves

Telfser, Anna and Gómez Galindo, Federico LU (2019) In LWT 99. p.148-155
Abstract

The effect of reversible permeabilization as pre-treatment before air drying at 40 °C, vacuum drying and freeze drying was investigated. The parameters of the electric treatment provoked reversible permeabilization of the tissue causing the guard cells to open stomata (65 pulses of 650 V/cm, 150 μs pulse width, 760 μs between pulses). The drying times of each of the tested drying methods were adjusted to obtain products with a moisture content of 75 g/kg. Dried samples were compared according to drying time, structural changes, rehydration capacity, colour and sensorial perception. Results showed that the PEF pre-treatment shortened the drying times 57% for air drying, 33% for vacuum drying and 25% for freeze drying. The stronger... (More)

The effect of reversible permeabilization as pre-treatment before air drying at 40 °C, vacuum drying and freeze drying was investigated. The parameters of the electric treatment provoked reversible permeabilization of the tissue causing the guard cells to open stomata (65 pulses of 650 V/cm, 150 μs pulse width, 760 μs between pulses). The drying times of each of the tested drying methods were adjusted to obtain products with a moisture content of 75 g/kg. Dried samples were compared according to drying time, structural changes, rehydration capacity, colour and sensorial perception. Results showed that the PEF pre-treatment shortened the drying times 57% for air drying, 33% for vacuum drying and 25% for freeze drying. The stronger influence of the PEF treatment on air drying was also evident on tissue structure where the most noticeable differences between the untreated and PEF-treated leaves were detected. Glandular trichomes on the surface of the leaves were better preserved when PEF was applied in combination with air drying and vacuum drying whereas freeze drying, with or without PEF, damaged the trichomes. PEF-treated, vacuum dried samples were found to be the closest to fresh leaves regarding colour and smell according to the sensory panel.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Air drying, Freeze drying, Pulsed electric fields, Structure, Vacuum drying
in
LWT
volume
99
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85054165052
ISSN
0023-6438
DOI
10.1016/j.lwt.2018.09.062
language
English
LU publication?
yes
id
02dd6aa0-468f-4abd-a992-042db112f81b
date added to LUP
2018-10-08 09:43:30
date last changed
2018-10-26 13:03:35
@article{02dd6aa0-468f-4abd-a992-042db112f81b,
  abstract     = {<p>The effect of reversible permeabilization as pre-treatment before air drying at 40 °C, vacuum drying and freeze drying was investigated. The parameters of the electric treatment provoked reversible permeabilization of the tissue causing the guard cells to open stomata (65 pulses of 650 V/cm, 150 μs pulse width, 760 μs between pulses). The drying times of each of the tested drying methods were adjusted to obtain products with a moisture content of 75 g/kg. Dried samples were compared according to drying time, structural changes, rehydration capacity, colour and sensorial perception. Results showed that the PEF pre-treatment shortened the drying times 57% for air drying, 33% for vacuum drying and 25% for freeze drying. The stronger influence of the PEF treatment on air drying was also evident on tissue structure where the most noticeable differences between the untreated and PEF-treated leaves were detected. Glandular trichomes on the surface of the leaves were better preserved when PEF was applied in combination with air drying and vacuum drying whereas freeze drying, with or without PEF, damaged the trichomes. PEF-treated, vacuum dried samples were found to be the closest to fresh leaves regarding colour and smell according to the sensory panel.</p>},
  author       = {Telfser, Anna and Gómez Galindo, Federico},
  issn         = {0023-6438},
  keyword      = {Air drying,Freeze drying,Pulsed electric fields,Structure,Vacuum drying},
  language     = {eng},
  month        = {01},
  pages        = {148--155},
  publisher    = {Elsevier},
  series       = {LWT},
  title        = {Effect of reversible permeabilization in combination with different drying methods on the structure and sensorial quality of dried basil (Ocimum basilicum L.) leaves},
  url          = {http://dx.doi.org/10.1016/j.lwt.2018.09.062},
  volume       = {99},
  year         = {2019},
}