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Projeto de investigação
Development of process technologies for the valorization of fish processing waste streams: integration of natural deep eutectic solvents NADES with supercritical CO2 extraction
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Low-Phytotoxic Deep Eutectic Systems as Alternative Extraction Media for the Recovery of Chitin from Brown Crab Shells
Publication . Rodrigues, Liliana A.; Radojčić Redovniković, Ivana; Duarte, Ana Rita C.; Matias, Ana A.; Paiva, Alexandre; Instituto de Tecnologia Química e Biológica António Xavier (ITQB); DQ - Departamento de Química; LAQV@REQUIMTE; ACS - American Chemical Society
The versatility of chitin and its derivatives has allowed their utilization in a wide range of applications, from wastewater treatment to pharmaceutical or biomedical industries. However, even though the extraction method used industrially is extremely efficient, it involves the use of strong acids and bases and results in the disposal of large quantities of toxic effluents. Deep eutectic systems (DESs) have emerged as a promising new class of alternative solvents, including for chitin recovery. Yet, the assessment of their toxicity has often been neglected. Therefore, in this work, the phytotoxicity of choline chloride (ChCl)/organic acid-based DESs toward wheat seeds was evaluated by measuring different growth parameters and stress biomarkers. DESs were then explored for the efficient recovery of chitin contained in brown crab shell residues at varying conditions of temperature and processing time as well as with and without water addition. The obtained chitin was then characterized through different analytical techniques and compared to a standard as well as to chitin obtained by a conventional acid/alkaline hydrolysis. Results have shown that by applying a ChCl/lactic acid-based DES (which was the system that showed the least phytotoxic effects on wheat; EC50 ≥ 1.6 mg/mL) at 130 °C, it was possible to obtain pure chitin (up to 98%) with characteristics similar to those presented by commercial chitin or chitin recovered by conventional hydrolysis in a shorter time (more than 8-fold faster), thus suggesting that ChCl/organic acid-based DESs can truly represent a low-phytotoxic alternative extraction media for the recovery of chitin from the crab shell biomass.
Development of process technologies for the valorisation of fish and shellfish processing waste streams: Integration of sub and supercritical fluids with deep eutectic systems
Publication . Rodrigues, Liliana A.; Matias, Ana; Alves, Paula
"The world’s strong dependency on fossil resources for energy generation and products manufacturing has arisen serious environmental problems and economic concerns. Therefore, the search for alternative solutions that enable an improvement of the quality of life of present and future generations, while sustaining the environment through the significant reduction of the exploitation and consumption of fossil fuels and the implementation of clean processing technologies, has become of the utmost importance. The path for a sustainable future lays, therefore, in the implementation of the biorefinery concept as a strategy for the establishment of a circular bioeconomy, aiming at producing a wide range of marketable products and energy, by using renewable biomass resources as feedstock.(...)"
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Entidade financiadora
Fundação para a Ciência e a Tecnologia
Programa de financiamento
OE
Número da atribuição
SFRH/BD/116002/2016