Cargando…

Porous Starch Materials via Supercritical- and Freeze-Drying

The production of porous materials based on starch has been explored with supercritical drying—yielding aerogel—and freeze-drying. The two drying procedures were applied on the same gelling solution of amylomaize starch pasted at 140 °C and for two concentrations (5 and 10 wt.%). After gelation and...

Descripción completa

Detalles Bibliográficos
Autores principales: Baudron, Victor, Gurikov, Pavel, Smirnova, Irina, Whitehouse, Steve
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473257/
https://www.ncbi.nlm.nih.gov/pubmed/30813640
http://dx.doi.org/10.3390/gels5010012
_version_ 1783412388623548416
author Baudron, Victor
Gurikov, Pavel
Smirnova, Irina
Whitehouse, Steve
author_facet Baudron, Victor
Gurikov, Pavel
Smirnova, Irina
Whitehouse, Steve
author_sort Baudron, Victor
collection PubMed
description The production of porous materials based on starch has been explored with supercritical drying—yielding aerogel—and freeze-drying. The two drying procedures were applied on the same gelling solution of amylomaize starch pasted at 140 °C and for two concentrations (5 and 10 wt.%). After gelation and retrogradation, water from the samples to be supercritically dried was exchanged to ethanol. The resulting starch aerogel presented high specific surface area (197 m(2)/g). Freeze-drying was assessed by investigating the effect of the gelation, retrogradation, freezing temperature, and sublimation pressure. The resulting starch materials were macroporous, with limited specific surface area and limited mechanical integrity. Cohesive open cell foam with pore size of ~20 µm was produced by quenching the hot starch melt in liquid nitrogen. The highest specific surface area obtained with freeze-drying was 7.7 m(2)/g for the hot starch melt frozen at −20 °C.
format Online
Article
Text
id pubmed-6473257
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-64732572019-04-29 Porous Starch Materials via Supercritical- and Freeze-Drying Baudron, Victor Gurikov, Pavel Smirnova, Irina Whitehouse, Steve Gels Article The production of porous materials based on starch has been explored with supercritical drying—yielding aerogel—and freeze-drying. The two drying procedures were applied on the same gelling solution of amylomaize starch pasted at 140 °C and for two concentrations (5 and 10 wt.%). After gelation and retrogradation, water from the samples to be supercritically dried was exchanged to ethanol. The resulting starch aerogel presented high specific surface area (197 m(2)/g). Freeze-drying was assessed by investigating the effect of the gelation, retrogradation, freezing temperature, and sublimation pressure. The resulting starch materials were macroporous, with limited specific surface area and limited mechanical integrity. Cohesive open cell foam with pore size of ~20 µm was produced by quenching the hot starch melt in liquid nitrogen. The highest specific surface area obtained with freeze-drying was 7.7 m(2)/g for the hot starch melt frozen at −20 °C. MDPI 2019-02-26 /pmc/articles/PMC6473257/ /pubmed/30813640 http://dx.doi.org/10.3390/gels5010012 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Baudron, Victor
Gurikov, Pavel
Smirnova, Irina
Whitehouse, Steve
Porous Starch Materials via Supercritical- and Freeze-Drying
title Porous Starch Materials via Supercritical- and Freeze-Drying
title_full Porous Starch Materials via Supercritical- and Freeze-Drying
title_fullStr Porous Starch Materials via Supercritical- and Freeze-Drying
title_full_unstemmed Porous Starch Materials via Supercritical- and Freeze-Drying
title_short Porous Starch Materials via Supercritical- and Freeze-Drying
title_sort porous starch materials via supercritical- and freeze-drying
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473257/
https://www.ncbi.nlm.nih.gov/pubmed/30813640
http://dx.doi.org/10.3390/gels5010012
work_keys_str_mv AT baudronvictor porousstarchmaterialsviasupercriticalandfreezedrying
AT gurikovpavel porousstarchmaterialsviasupercriticalandfreezedrying
AT smirnovairina porousstarchmaterialsviasupercriticalandfreezedrying
AT whitehousesteve porousstarchmaterialsviasupercriticalandfreezedrying