<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Lopes, M. H.</style></author><author><style face="normal" font="default" size="100%">Barros, A. S.</style></author><author><style face="normal" font="default" size="100%">Pascoal Neto, C.</style></author><author><style face="normal" font="default" size="100%">Rutledge, D.</style></author><author><style face="normal" font="default" size="100%">Delgadillo, I.</style></author><author><style face="normal" font="default" size="100%">Gil, A. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Variability of cork from Portuguese Quercus suber studied by solid-state 13C-NMR and FTIR spectroscopies</style></title><secondary-title><style face="normal" font="default" size="100%">Biopolymers</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">13C-cross-polarization with magic angle spinning</style></keyword><keyword><style  face="normal" font="default" size="100%">chemometrics</style></keyword><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">outer product analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">photoacoustic FTIR</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus suber Linnaeus</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2001///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://dx.doi.org/10.1002/bip.1022</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">62</style></volume><pages><style face="normal" font="default" size="100%">268 - 277</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A new approach is presented for the study of the variability of Portuguese reproduction cork using solid-state 13C-NMR spectroscopy and photoacoustic (PAS) FTIR (FTIR-PAS) spectroscopy combined with chemometrics. Cork samples were collected from 12 different geographical sites, and their 13C-cross-polarization with magic angle spinning (CP/MAS) and FTIR spectra were registered. A large spectral variability among the cork samples was detected by principal component analysis and found to relate to the suberin and carbohydrate contents. This variability was independent of the sample geographical origin but significantly dependent on the cork quality, thus enabling the distinction of cork samples according to the latter property. The suberin content of the cork samples was predicted using multivariate regression models based on the 13C-NMR and FTIR spectra of the samples as reported previously. Finally, the relationship between the variability of the 13C-CP/MAS spectra with that of the FTIR-PAS spectra was studied by outer product analysis. This type of multivariate analysis enabled a clear correlation to be established between the peaks assigned to suberin and carbohydrate in the FTIR spectrum and those appearing in the 13C-CP/MAS spectra. © 2001 John Wiley &amp; Sons, Inc. Biopolymers (Biospectroscopy) 62: 268–277, 2001</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: John Wiley &amp; Sons, Inc.</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Lopes, M. H.</style></author><author><style face="normal" font="default" size="100%">Neto, C. Pascoal</style></author><author><style face="normal" font="default" size="100%">Barros, A. S.</style></author><author><style face="normal" font="default" size="100%">Rutledge, D.</style></author><author><style face="normal" font="default" size="100%">Delgadillo, I.</style></author><author><style face="normal" font="default" size="100%">Gil, A. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Quantitation of aliphatic suberin in Quercus suber L. cork by FTIR spectroscopy and solid-state 13C-NMR spectroscopy</style></title><secondary-title><style face="normal" font="default" size="100%">Biopolymers</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">13 C-cross polarization/ magic angle spinning</style></keyword><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">FTIR spectroscopy with photoacoustic detection</style></keyword><keyword><style  face="normal" font="default" size="100%">multivariate calibration</style></keyword><keyword><style  face="normal" font="default" size="100%">quantitation</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus suber L.</style></keyword><keyword><style  face="normal" font="default" size="100%">solid-state NMR</style></keyword><keyword><style  face="normal" font="default" size="100%">suberin</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2000</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2000///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://dx.doi.org/10.1002/1097-0282(2000)57:6&lt;344::AID-BIP40&gt;3.0.CO2-#</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">57</style></volume><pages><style face="normal" font="default" size="100%">344 - 351</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">This work determined that the percentage of suberin in cork may be found by solid-state 13C cross polarization/magic angle spinning (CP/MAS) NMR spectroscopy and by FTIR with photoacoustic detection (FTIR-PAS) spectroscopy. A linear relationship is found between the suberin content measured through CP/MAS spectral areas and that measured gravimetrically. Furthermore, application of a partial least squares (PLS1) regression model to the NMR and gravimetric data sets clearly correlates the two sets, enabling suberin quantification with 90% precision. Suberin quantitation by FTIR-PAS spectroscopy is also achieved by a PLS1 regression model, giving 90% accurate estimates of the percentage of suberin in cork. Therefore, 13C-CP/MAS NMR and FTIR-PAS proved to be useful and accurate noninvasive techniques to quantify suberin in cork, thus avoiding the traditional time consuming and destructive chemical methods. © 2000 John Wiley &amp; Sons, Inc. Biopolymers (Biospectroscopy) 57: 344–351, 2000</style></abstract><issue><style face="normal" font="default" size="100%">6</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: John Wiley &amp; Sons, Inc.</style></notes></record></records></xml>