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Evaluation of grape stalks as a bioresource |
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| Authors: | Lan PingNicolas Brosse Poulomi SannigrahiArthur Ragauskas |
| Affiliation: | a College of Wood Science and Technology, Nanjing Forestry University, Nanjing 210037, China b Laboratoire d’Etude et de Recherche sur le MAteriau Bois, Faculté des Sciences et Techniques, Nancy-Université, Bld des Aiguillettes, F-54500 Vandoeuvre-lès-Nancy, France c School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA |
| Abstract: | The compositional characteristics of grape stalk in terms of lignin, sugars, ash, extractives and tannins contents were established. The biomass composition of grape stalk is 34% lignin, 36% cellulose, 24% hemicellulose and 6% tannins. The tannins, analysed by solution 13C NMR, were essentially of procyanidin type and the dichloromethane extractives fraction, characterized by GC-MS, was mainly composed of fatty acids. Different processes for the pretreatment of grape stalk were compared. Due to the high content of lignin and tannins, dilute sulfuric acid and ethanol organosolv pretreatments resulted in a low degree of delignification. However, a wet oxidation process permitted a significant reduction of the Klason lignin content of the pulp with a good carbohydrate recovery and improved enzymatic digestibility. |
| Keywords: | Tannin Grape stalk Agricultural residues Wet oxidation Pretreatment |
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