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Determination of the Hydroxy and Carboxylic Acid Groups in Natural Complex Mixt...
Sousa, Andreia F.; Gandini, Alessandro; Silvestre, Armando J. D.; Neto, Carlos PascoalThe 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) sp...
Quercus suber and Betula pendula outer barks as renewable sources of oleochemic...
Pinto, Paula C. R. O.; Sousa, Andreia F.; Silvestre, Armando J. D.; Neto, Carlos Pascoal; Gandini, Alessandro; Eckerman, Christer; Holmbom, BjarneA comparative study on the chemical composition of oak cork (Quercus suber L.) and corresponding industrial residues and birch (Betula pendula L.) outer bark is reported. Cork oak samples have lower extractives contents (6-9%) and higher contents of carbohydrates and lignin (23-27 and 33-38%, respectively) than those found for birch outer bark (40, 6 and 9%, respectively); suberin contents accounted for around ...
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