Determination of the Hydroxy and Carboxylic Acid Groups in Natural Complex Mixtures of Hydroxy Fatty Acids by H-1 Nuclear Magnetic Resonance Spectroscopy
authors Sousa, AF; Gandini, A; Silvestre, AJD; Neto, CP
nationality International
journal APPLIED SPECTROSCOPY
author keywords Hydroxy fatty acids; Functional group analysis; H-1 NMR; Suberin; Natural monomers; Oleochemicals
keywords END-GROUPS; QUERCUS-SUBER; POLYESTER; CORK
abstract 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 H-1 nuclear magnetic resonance (NMR) spectroscopy. All the samples thus analyzed displayed an excess of CO2H (or CO2CH3) 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.
publisher SOC APPLIED SPECTROSCOPY
issn 0003-7028
year published 2009
volume 63
issue 8
beginning page 873
ending page 878
web of science category Instruments & Instrumentation; Spectroscopy
subject category Instruments & Instrumentation; Spectroscopy
unique article identifier WOS:000268980300003
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journal analysis (jcr 2017):
journal impact factor 1.642
5 year journal impact factor 1.928
category normalized journal impact factor percentile 47.674
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