Functionalization of chitosan by laccase-catalyzed oxidation of ferulic acid and ethyl ferulate under heterogeneous reaction conditions
Identifieur interne : 000866 ( Main/Merge ); précédent : 000865; suivant : 000867Functionalization of chitosan by laccase-catalyzed oxidation of ferulic acid and ethyl ferulate under heterogeneous reaction conditions
Auteurs : Abdulhadi Aljawish [France] ; Isabelle Chevalot [France] ; Bernadette Piffaut [France] ; Corinne Rondeau-Mouro [France] ; Michel Girardin [France] ; Jordane Jasniewski [France] ; Joël Scher [France] ; Lionel Muniglia [France]Source :
- Carbohydrate Polymers [ 0144-8617 ] ; 2012-01-04.
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Abstract
Chitosan particles were functionalized with ferulic acid (FA) and ethyl ferulate (EF) as substrates using laccase from Myceliophtora thermophyla as biocatalyst. The reactions were performed with chitosan particles under an eco-friendly procedure, in a heterogeneous system at 30 degrees C, in phosphate buffer (50 mM, pH 7.5). The FA-chitosan derivative presented an intense yellow-orange color stable while the EF-chitosan derivative was colorless. The spectroscopic analyses indicated that the reaction products bound covalently to the free amino groups of chitosan exhibiting a novel absorbance band in the UV/Vis spectra between 300 and 350 nm, at C-2 region by the duplication of C-2 signal in the (13)C NMR spectrum, via Schiff base bond (N=C) exhibiting novel bands in the FT-IR spectrum at 1640 and 1620 cm(-1). Additionally, antioxidant capacities of chitosan derivatives showed that the chitosan derivatives presented improved antioxidant properties, especially for FA-chitosan derivative (EC(50) were 0.52 +/- 0.04, 0.20 +/- 0.02 mg/ml for DPPH(center dot) and ABTS(center dot+) scavenging, respectively).
Url:
DOI: 10.1016/j.carbpol.2011.08.016
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<author><name sortKey="Girardin, Michel" sort="Girardin, Michel" uniqKey="Girardin M" first="Michel" last="Girardin">Michel Girardin</name>
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<author><name sortKey="Scher, Joel" sort="Scher, Joel" uniqKey="Scher J" first="Joël" last="Scher">Joël Scher</name>
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<idno type="DOI">10.1016/j.carbpol.2011.08.016</idno>
<series><title level="j">Carbohydrate Polymers</title>
<idno type="ISSN">0144-8617</idno>
<imprint><date type="datePub">2012-01-04</date>
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<profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>Antioxidant properties</term>
<term>Chitosan</term>
<term>Enzymatic functionalization</term>
<term>Ethyl ferulate</term>
<term>Ferulic acid</term>
<term>Myceliophtora thermophyla laccase</term>
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<front><div type="abstract" xml:lang="en">Chitosan particles were functionalized with ferulic acid (FA) and ethyl ferulate (EF) as substrates using laccase from Myceliophtora thermophyla as biocatalyst. The reactions were performed with chitosan particles under an eco-friendly procedure, in a heterogeneous system at 30 degrees C, in phosphate buffer (50 mM, pH 7.5). The FA-chitosan derivative presented an intense yellow-orange color stable while the EF-chitosan derivative was colorless. The spectroscopic analyses indicated that the reaction products bound covalently to the free amino groups of chitosan exhibiting a novel absorbance band in the UV/Vis spectra between 300 and 350 nm, at C-2 region by the duplication of C-2 signal in the (13)C NMR spectrum, via Schiff base bond (N=C) exhibiting novel bands in the FT-IR spectrum at 1640 and 1620 cm(-1). Additionally, antioxidant capacities of chitosan derivatives showed that the chitosan derivatives presented improved antioxidant properties, especially for FA-chitosan derivative (EC(50) were 0.52 +/- 0.04, 0.20 +/- 0.02 mg/ml for DPPH(center dot) and ABTS(center dot+) scavenging, respectively).</div>
</front>
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