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Porous Starch Materials via Supercritical- and Freeze-Drying

1
Institute of Thermal Separation Processes, Hamburg University of Technology (TUHH), 22073 Hamburg, Germany
2
Nestlé Product Technology Centre York, Nestec York LTD, PO BOX 204, York YO91 1XY, UK
*
Author to whom correspondence should be addressed.
Received: 17 December 2018 / Revised: 6 February 2019 / Accepted: 10 February 2019 / Published: 26 February 2019
(This article belongs to the Special Issue Cryogelation and Cryogels)
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Abstract

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 m2/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 m2/g for the hot starch melt frozen at −20 °C. View Full-Text
Keywords: freeze-drying; supercritical drying; aerogel; starch; open cell foam; cryogel; cryogelation freeze-drying; supercritical drying; aerogel; starch; open cell foam; cryogel; cryogelation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Baudron, V.; Gurikov, P.; Smirnova, I.; Whitehouse, S. Porous Starch Materials via Supercritical- and Freeze-Drying. Gels 2019, 5, 12.

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