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• Calce, E
• Bugatti, V
• Vittoria, V
• De Luca, S
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• Calce, E
• Bugatti, V
• Vittoria, V
• De Luca, S
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• Bugatti, V
• Vittoria, V
• De Luca, S

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Molecules 2012, 17(10), 12234-12242; doi:10.3390/molecules171012234

Communication

Solvent-Free Synthesis of Modified Pectin Compounds Promoted by Microwave Irradiation

Enrica Calce ¹ , Valeria Bugatti ² , Vittoria Vittoria ²  and Stefania De Luca ^1,*

¹ Institute of Biostructures and Bioimages, National Research Council, 80138 Naples, Italy ² Department of Industrial Engineering, University of Salerno, 84084 Fisciano (SA), Italy

* Author to whom correspondence should be addressed.

Received: 14 September 2012; in revised form: 1 October 2012 / Accepted: 16 October 2012 / Published: 18 October 2012

(This article belongs to the Special Issue Solvent-Free Synthesis)

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Abstract: Microwave-assisted solvent-free modification of pectin was successfully accomplished, consisting in the esterification of several fatty acids by pectin alcoholic functions. The reaction was performed by simply mixing the reagents with a catalytic amount of the inorganic base (potassium carbonate) and irradiating the obtained mixture with microwaves for a short time (3–6 min). The replacement of the traditional heating with a microwave source allowed the development of a new synthetic protocol which provided increased yield of the final products, since it eliminates the small amount of degraded polysaccharide produced during traditional oil bath heating. The desired esters were fully characterized by FT-IR spectroscopy and thermogravimetric analysis.

Keywords: pectin; microwave irradiation; solvent-free; green chemistry

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