Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR

Tannin extracts were prepared from barks of maritime pine (Pinus maritimus), aleppo pine (Pinus halepensis), Norway spruce (Picea abies) and from a mixture of barks of different pine species (Pinus spp., namely 20% black pine (Pinus thunbergii)+ 30% Scots pine (Pinus sylvestris) + 20% maritime pine...

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Autores principales:	Navarrete,P, Pizzi,A, Bertaud,F, Rigolet,S
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2011
Materias:	Catechinic acid tannins rearrangements reactivity inhibition NMR wood adhesives
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2011000100006
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spelling	oai:scielo:S0718-221X20110001000062011-05-30Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMRNavarrete,PPizzi,ABertaud,FRigolet,S Catechinic acid tannins rearrangements reactivity inhibition NMR wood adhesives Tannin extracts were prepared from barks of maritime pine (Pinus maritimus), aleppo pine (Pinus halepensis), Norway spruce (Picea abies) and from a mixture of barks of different pine species (Pinus spp., namely 20% black pine (Pinus thunbergii)+ 30% Scots pine (Pinus sylvestris) + 20% maritime pine (Pinus maritimus) + 10% Aleppo Pine (Pinus halepensis) + 5% Douglas fir (Pseudotsuga menziesii) + 15% Norway spruce (Picea abies)) at a paper mill. The 13C-NMR spectra were carried out from these tannins. Blending systems adhesives were prephe increase number of smaller bands between 20 and 65 ppm clearly indicate that the extraction of procyanidin-type tannins has been incorrect yielded high relative proportions of catechinic acid structures and diarylpropanol-catechinin acid dimer caused by internal flavonoid rearrangement, and causing the blockage of the C6 and C8 reactive sites, rendering unusable the tannin for wood adhesive applications. Thus, the gel times are very long except for the maritime pine tannin with a value of 51 (s). The TMA analysis gave very low MOE values for almost all the tannin extract samples, except for maritime pine. This situation was confirmed by the IB test. Only maritime pine tannin presented a good mechanical resistance with a value of 0.6 (MPa). Only this sample fulfils the standard requested.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.13 n.1 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2011000100006en10.4067/S0718-221X2011000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Catechinic acid tannins rearrangements reactivity inhibition NMR wood adhesives
spellingShingle	Catechinic acid tannins rearrangements reactivity inhibition NMR wood adhesives Navarrete,P Pizzi,A Bertaud,F Rigolet,S Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR
description	Tannin extracts were prepared from barks of maritime pine (Pinus maritimus), aleppo pine (Pinus halepensis), Norway spruce (Picea abies) and from a mixture of barks of different pine species (Pinus spp., namely 20% black pine (Pinus thunbergii)+ 30% Scots pine (Pinus sylvestris) + 20% maritime pine (Pinus maritimus) + 10% Aleppo Pine (Pinus halepensis) + 5% Douglas fir (Pseudotsuga menziesii) + 15% Norway spruce (Picea abies)) at a paper mill. The 13C-NMR spectra were carried out from these tannins. Blending systems adhesives were prephe increase number of smaller bands between 20 and 65 ppm clearly indicate that the extraction of procyanidin-type tannins has been incorrect yielded high relative proportions of catechinic acid structures and diarylpropanol-catechinin acid dimer caused by internal flavonoid rearrangement, and causing the blockage of the C6 and C8 reactive sites, rendering unusable the tannin for wood adhesive applications. Thus, the gel times are very long except for the maritime pine tannin with a value of 51 (s). The TMA analysis gave very low MOE values for almost all the tannin extract samples, except for maritime pine. This situation was confirmed by the IB test. Only maritime pine tannin presented a good mechanical resistance with a value of 0.6 (MPa). Only this sample fulfils the standard requested.
author	Navarrete,P Pizzi,A Bertaud,F Rigolet,S
author_facet	Navarrete,P Pizzi,A Bertaud,F Rigolet,S
author_sort	Navarrete,P
title	Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR
title_short	Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR
title_full	Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR
title_fullStr	Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR
title_full_unstemmed	Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR
title_sort	condensed tannin reactivity inhibition by internal rearrangements: detection by cp-mas 13c nmr
publisher	Universidad del Bío-Bío
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2011000100006
work_keys_str_mv	AT navarretep condensedtanninreactivityinhibitionbyinternalrearrangementsdetectionbycpmas13cnmr AT pizzia condensedtanninreactivityinhibitionbyinternalrearrangementsdetectionbycpmas13cnmr AT bertaudf condensedtanninreactivityinhibitionbyinternalrearrangementsdetectionbycpmas13cnmr AT rigolets condensedtanninreactivityinhibitionbyinternalrearrangementsdetectionbycpmas13cnmr
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Condensed tannin reactivity inhibition by internal rearrangements: Detection by CP-MAS 13C NMR

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