tThe extraction of cellulose nanocrystals (CNC) from Carmagnola hemp fibres has been carried out. BeforeCNC extraction, the effectiveness of two pre-treatment methods, an alkaline chemical and a pectinaseenzymatic treatment, applied on the pristine and carded hemp fibres, were compared. Carding allowedremoval of most impurities from the fibres, while it had only a modest effect on their structure. Afterchemical treatment, hemicellulose was removed, more efficiently in carded hemp, and X-ray diffractionsuggests an increase in the size of cellulose crystallites. Carded hemp fibres, after interaction with pecti-nase, show the total decomposition of pectin and hemicellulose. On the basis of these results, carded hempwas selected as start material for CNC extraction and the acid hydrolysis for CNC synthesis was appliedon carded hemp after both chemical and enzymatic procedures. The yield of the different hydrolysismethods remains approximately at the same level (around 19%): on the other side, a carding procedure,combined with an alkaline treatment to hemp fibres, represents an optimized process for CNC extractionby acid hydrolysis.

Optimized extraction of cellulose nanocrystals from pristine and carded hemp fibres

Santulli C;
2014-01-01

Abstract

tThe extraction of cellulose nanocrystals (CNC) from Carmagnola hemp fibres has been carried out. BeforeCNC extraction, the effectiveness of two pre-treatment methods, an alkaline chemical and a pectinaseenzymatic treatment, applied on the pristine and carded hemp fibres, were compared. Carding allowedremoval of most impurities from the fibres, while it had only a modest effect on their structure. Afterchemical treatment, hemicellulose was removed, more efficiently in carded hemp, and X-ray diffractionsuggests an increase in the size of cellulose crystallites. Carded hemp fibres, after interaction with pecti-nase, show the total decomposition of pectin and hemicellulose. On the basis of these results, carded hempwas selected as start material for CNC extraction and the acid hydrolysis for CNC synthesis was appliedon carded hemp after both chemical and enzymatic procedures. The yield of the different hydrolysismethods remains approximately at the same level (around 19%): on the other side, a carding procedure,combined with an alkaline treatment to hemp fibres, represents an optimized process for CNC extractionby acid hydrolysis.
2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/426401
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