Low Cost Chitosan Biopolymer for Environmental Use Made from Abundant Shrimp Wastes

Chitosan, an important biopolymer with many uses, is made by deacetylation of chitin. Classical hydrolysis at high temperatures (above 100 °C) in 50 % concentrated sodium hydroxide during several hours produces chitosan, a poly-beta-glucosamine. This chemical deacetylation step is often performed un...

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Veröffentlicht in:Waste and biomass valorization 2017-03, Vol.8 (2), p.401-406
Hauptverfasser: Kadouche, S., Farhat, M., Lounici, H., Fiallo, M., Sharrock, P., Mecherri, M., Hadioui, M.
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container_end_page 406
container_issue 2
container_start_page 401
container_title Waste and biomass valorization
container_volume 8
creator Kadouche, S.
Farhat, M.
Lounici, H.
Fiallo, M.
Sharrock, P.
Mecherri, M.
Hadioui, M.
description Chitosan, an important biopolymer with many uses, is made by deacetylation of chitin. Classical hydrolysis at high temperatures (above 100 °C) in 50 % concentrated sodium hydroxide during several hours produces chitosan, a poly-beta-glucosamine. This chemical deacetylation step is often performed under pressure in boiling ethyleneglycol and tends to degrade polymer chain length, thus the interesting polymer properties. It is convenient to search for a more economical production pathway in order to make chitosan available for environmental applications, such as use in water suspended matter flocculation. Chitin was extracted from the exoskeletons of shrimps and its deacetylation kinetics was followed for 35 days at 20 and 35 °C. The results obtained using different techniques (conductivity, viscometry, 13 C NMR and thermogravimetry) showed that the deacetylation degree of chitin increased with the incubation time reaching 99 and 88 % at 35 and 20 °C, respectively, after 35 days. Moreover, during the incubation time, the molecular weight of chitosan showed moderate decrease compared to deacetylated chitin at high temperature. Clarification or urban waste water with chitosan biopolymer demonstrated good results at 1.5 mg/L concentrations.
doi_str_mv 10.1007/s12649-016-9593-2
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Classical hydrolysis at high temperatures (above 100 °C) in 50 % concentrated sodium hydroxide during several hours produces chitosan, a poly-beta-glucosamine. This chemical deacetylation step is often performed under pressure in boiling ethyleneglycol and tends to degrade polymer chain length, thus the interesting polymer properties. It is convenient to search for a more economical production pathway in order to make chitosan available for environmental applications, such as use in water suspended matter flocculation. Chitin was extracted from the exoskeletons of shrimps and its deacetylation kinetics was followed for 35 days at 20 and 35 °C. The results obtained using different techniques (conductivity, viscometry, 13 C NMR and thermogravimetry) showed that the deacetylation degree of chitin increased with the incubation time reaching 99 and 88 % at 35 and 20 °C, respectively, after 35 days. 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subjects Biopolymers
Chitin
Chitosan
Deacetylation
Engineering
Environment
Environmental assessment
Environmental Engineering/Biotechnology
Exoskeletons
Flocculation
High temperature
Industrial Pollution Prevention
Municipal waste management
NMR
Nuclear magnetic resonance
Organic chemistry
Original Paper
Reaction kinetics
Renewable and Green Energy
Shrimps
Sodium hydroxide
Thermogravimetry
Viscometry
Waste Management/Waste Technology
Wastewater
title Low Cost Chitosan Biopolymer for Environmental Use Made from Abundant Shrimp Wastes
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