Using transgenic poplars to elucidate the relationship between the structure and the thermal properties of lignins.
In an attempt to draw relationships between the molecular structure and the thermal behavior of lignins, thermomechanical analyses were run on six milled wood and enzyme poplar lignin fractions prepared from genetically modified and control woods. All the lignin samples displayed similar thermal profiles with a clear inflection point assigned to the glass transition point. The temperature (T(g)) at which this transition occurs showed large variations from 170 to 190 degrees C, depending both on the genetic modification and on the age of the tree. These variations were found to be closely related to the condensation degree of lignins evaluated by thioacidolysis.
Baumberger
Stéphanie
S
UMR de Chimie Biologique, INRA/INA PG, Institut National Agronomique Paris-Grignon, 78850 Thiverval Grignon, France. baumberg@grignon.inra.fr
Dole
Patrice
P
Lapierre
Catherine
C
D000429:Alcohol Oxidoreductases / Q000172:deficiency / Q000235:genetics; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D006358:Hot Temperature; D008031:Lignin / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D019684:Magnoliopsida / Q000235:genetics*; D008780:Methyltransferases / Q000172:deficiency / Q000235:genetics; D030821:Plants, Genetically Modified; D013816:Thermodynamics; D014197:Trees / Q000235:genetics*; D014934:Wood
D008031:Lignin; D000429:Alcohol Oxidoreductases; C018656:cinnamyl alcohol dehydrogenase; D008780:Methyltransferases