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Low‐density insulation blocks and hardboards from amaranth (Amaranthus cruentus) stems, a new perspective for building applications

Evon, Philippe and de Langalerie, Guyonne and Labonne, Laurent and Merah, Othmane and Talou, Thierry and Ballas, Stéphane and Véronèse, Thierry Low‐density insulation blocks and hardboards from amaranth (Amaranthus cruentus) stems, a new perspective for building applications. (2021) Coatings, 11 (349). 1-19. ISSN 2079-6412

(Document in English)

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Official URL: https://doi.org/10.3390/coatings11030349


Nowadays, amaranth appears as a promising source of squalene of vegetable origin. Am‐aranth oil is indeed one of the most concentrated vegetable oils in squalene, i.e., up to 6% (w/w). This triterpene is highly appreciated in cosmetology, especially for the formulation of moisturizing creams. It is almost exclusively extracted from the liver of sharks, causing their overfishing. Thus, providing a squalene of renewable origin is a major challenge for the cosmetic industry. The ama‐ranth plant has thus experienced renewed interest in recent years. In addition to the seeds, a stem is  also  produced during cultivation.  Representing up to 80%  (w/w) of  the  plant aerial part,  it  is  composed of a ligneous fraction, the bark, on its periphery, and a pith in its middle. In this study, a fractionation process was developed to separate bark and pith. These two fractions were then used to produce renewable materials for building applications. On the one hand, the bark was used to produce hardboards, with the deoiled seeds acting as natural binder. Such boards are a viable al‐ternative to commercial wood‐based panels. On the other hand, the pith was transformed into co‐hesive and machinable low‐density insulation blocks revealing a low thermal conductivity value.

Item Type:Article
Additional Information:Copyright: © 2021 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/).
HAL Id:hal-03190896
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut national de recherche pour l'agriculture, l'alimentation et l'environnement - INRAE (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Ovalie Innovation (FRANCE)
Laboratory name:
Deposited On:30 Mar 2021 15:00

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