Rehydration and shrinkage behaviour of dried pineapple
Main Author: | |
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Publication Date: | 2001 |
Other Authors: | , |
Format: | Conference object |
Language: | eng |
Source: | Repositório Institucional da UNESP |
Download full: | http://hdl.handle.net/11449/32582 |
Summary: | The shrinking behavior, apparent densities and rehydration indexes of fresh and osmotically pre-treated pineapple slices during air-drying were obtained. The air drying velocity varied from 1.5 to 2.5 m/s and the air temperature from 40 to 70 degreesC. By means of automatic control, it was possible to obtain drying curves under conditions of constant product temperature. Volumetric shrinkage of fresh samples was temperature independent for drying at high air velocities but, at lower velocities, increased with decreasing drying temperature. Osmotically pre-treating the material resulted in reduced shrinkage, as well as drying with product temperature controlled, due to lower drying times needed that led to shorter high temperature exposition. Moisture dependence of apparent density was highly non-linear and could be fitted by an empirical model. Fresh sample rehydration indexes were higher than osmosed ones and increased with increasing temperature, except for pre-treated samples dried at 70 degreesC, probably due to superficial sugar caramelization, which reduced surface water permeability. |
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Rehydration and shrinkage behaviour of dried pineapplevolumetric shrinkageapparent densityosmotic dryingair-dryingThe shrinking behavior, apparent densities and rehydration indexes of fresh and osmotically pre-treated pineapple slices during air-drying were obtained. The air drying velocity varied from 1.5 to 2.5 m/s and the air temperature from 40 to 70 degreesC. By means of automatic control, it was possible to obtain drying curves under conditions of constant product temperature. Volumetric shrinkage of fresh samples was temperature independent for drying at high air velocities but, at lower velocities, increased with decreasing drying temperature. Osmotically pre-treating the material resulted in reduced shrinkage, as well as drying with product temperature controlled, due to lower drying times needed that led to shorter high temperature exposition. Moisture dependence of apparent density was highly non-linear and could be fitted by an empirical model. Fresh sample rehydration indexes were higher than osmosed ones and increased with increasing temperature, except for pre-treated samples dried at 70 degreesC, probably due to superficial sugar caramelization, which reduced surface water permeability.Univ Estadual Paulista, Dept Engn & Tecnol ALimentos, BR-15054000 Sao Jose do Rio Preto, SP, BrazilUniv Estadual Paulista, Dept Engn & Tecnol ALimentos, BR-15054000 Sao Jose do Rio Preto, SP, BrazilIsnt Tecnologico VeracruzUniversidade Estadual Paulista (Unesp)Nicoleti, J. F.Telis-Romero, J.Telis, VRN2014-05-20T15:21:26Z2014-05-20T15:21:26Z2001-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject253-262Proceedings of the Second Inter-american Drying Conference. Veracruz 91860: Isnt Tecnologico Veracruz, p. 253-262, 2001.http://hdl.handle.net/11449/32582WOS:0001728090000209457081088108168Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProceedings of the Second Inter-american Drying Conferenceinfo:eu-repo/semantics/openAccess2021-10-23T21:37:53Zoai:repositorio.unesp.br:11449/32582Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T21:37:53Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Rehydration and shrinkage behaviour of dried pineapple |
title |
Rehydration and shrinkage behaviour of dried pineapple |
spellingShingle |
Rehydration and shrinkage behaviour of dried pineapple Nicoleti, J. F. volumetric shrinkage apparent density osmotic drying air-drying |
title_short |
Rehydration and shrinkage behaviour of dried pineapple |
title_full |
Rehydration and shrinkage behaviour of dried pineapple |
title_fullStr |
Rehydration and shrinkage behaviour of dried pineapple |
title_full_unstemmed |
Rehydration and shrinkage behaviour of dried pineapple |
title_sort |
Rehydration and shrinkage behaviour of dried pineapple |
author |
Nicoleti, J. F. |
author_facet |
Nicoleti, J. F. Telis-Romero, J. Telis, VRN |
author_role |
author |
author2 |
Telis-Romero, J. Telis, VRN |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Nicoleti, J. F. Telis-Romero, J. Telis, VRN |
dc.subject.por.fl_str_mv |
volumetric shrinkage apparent density osmotic drying air-drying |
topic |
volumetric shrinkage apparent density osmotic drying air-drying |
description |
The shrinking behavior, apparent densities and rehydration indexes of fresh and osmotically pre-treated pineapple slices during air-drying were obtained. The air drying velocity varied from 1.5 to 2.5 m/s and the air temperature from 40 to 70 degreesC. By means of automatic control, it was possible to obtain drying curves under conditions of constant product temperature. Volumetric shrinkage of fresh samples was temperature independent for drying at high air velocities but, at lower velocities, increased with decreasing drying temperature. Osmotically pre-treating the material resulted in reduced shrinkage, as well as drying with product temperature controlled, due to lower drying times needed that led to shorter high temperature exposition. Moisture dependence of apparent density was highly non-linear and could be fitted by an empirical model. Fresh sample rehydration indexes were higher than osmosed ones and increased with increasing temperature, except for pre-treated samples dried at 70 degreesC, probably due to superficial sugar caramelization, which reduced surface water permeability. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001-01-01 2014-05-20T15:21:26Z 2014-05-20T15:21:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Proceedings of the Second Inter-american Drying Conference. Veracruz 91860: Isnt Tecnologico Veracruz, p. 253-262, 2001. http://hdl.handle.net/11449/32582 WOS:000172809000020 9457081088108168 |
identifier_str_mv |
Proceedings of the Second Inter-american Drying Conference. Veracruz 91860: Isnt Tecnologico Veracruz, p. 253-262, 2001. WOS:000172809000020 9457081088108168 |
url |
http://hdl.handle.net/11449/32582 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Proceedings of the Second Inter-american Drying Conference |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
253-262 |
dc.publisher.none.fl_str_mv |
Isnt Tecnologico Veracruz |
publisher.none.fl_str_mv |
Isnt Tecnologico Veracruz |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797789716278411264 |