Determination of the Hydroxy and Carboxylic Acid Groups in Natural Complex Mixt...

• Author(s): Sousa, Andreia F. ; Gandini, Alessandro ; Silvestre, Armando J. D. ; Neto, Carlos Pascoal
• Date: 2009
• Persistent ID: http://hdl.handle.net/10773/5163
• Origin: RIA - Repositório Institucional da Universidade de Aveiro
• Subject(s): Hydroxy fatty acids; Functional group analysis; 1 H NMR; Suberin; Natural monomers; Oleochemicals
• Document Type: Article
• Language: English

Description

The use of trichloroacetyl isocyanate (TAI) to mark both hydroxyl and carboxyl groups borne by the hydrolysis or methanolysis of suberin fragments (a complex mixture of hydroxy fatty acids), allowed the quantitative assessment of the ratio between carboxyl and hydroxy groups, as well as the ratio between primary and secondary hydroxy groups, to be carried out reliably by (1)H nuclear magnetic resonance (NMR) spectroscopy. All the samples thus analyzed displayed an excess of CO(2)H (or CO(2)CH(3)) functions with respect to the OH counterparts, albeit to a variable extent, depending on the procedure adopted to isolate the suberin fragments. The precise knowledge of the molar ratio of these two reactive moieties is fundamental for the correct utilization of suberin monomers in polymerization reactions leading to aliphatic polyesters. FCT - SFRH/ BD/38890/2007