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Authors = Bjarne Holmbom

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11 pages, 133 KiB  
Article
Pyrolysis of Softwood Carbohydrates in a Fluidized Bed Reactor
by Atte Aho, Narendra Kumar, Kari Eränen, Bjarne Holmbom, Mikko Hupa, Tapio Salmi and Dmitry Yu. Murzin
Int. J. Mol. Sci. 2008, 9(9), 1665-1675; https://doi.org/10.3390/ijms9091665 - 2 Sep 2008
Cited by 61 | Viewed by 11793
Abstract
In the present work pyrolysis of pure pine wood and softwood carbohydrates, namely cellulose and galactoglucomannan (the major hemicellulose in coniferous wood), was conducted in a batch mode operated fluidized bed reactor. Temperature ramping (5°C/min) was applied to the heating until a reactor [...] Read more.
In the present work pyrolysis of pure pine wood and softwood carbohydrates, namely cellulose and galactoglucomannan (the major hemicellulose in coniferous wood), was conducted in a batch mode operated fluidized bed reactor. Temperature ramping (5°C/min) was applied to the heating until a reactor temperature of 460 °C was reached. Thereafter the temperature was kept until the release of non-condensable gases stopped. The different raw materials gave significantly different bio-oils. Levoglucosan was the dominant product in the cellulose pyrolysis oil. Acetic acid was found in the highest concentrations in both the galactoglucomannan and in the pine wood pyrolysis oils. Acetic acid is most likely formed by removal of O-acetyl groups from mannose units present in GGM structure. Full article
(This article belongs to the Special Issue Biofuels R&D: Securing the Planet's Future Energy Needs)
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13 pages, 157 KiB  
Article
A Novel Antioxidant Phenyl Disaccharide from Populus tremula Knotwood
by Madalina Neacsu, Vicente Micol, Laura Pérez-Fons, Stefan Willför, Bjarne Holmbom and Ricardo Mallavia
Molecules 2007, 12(2), 205-217; https://doi.org/10.3390/12020205 - 19 Feb 2007
Cited by 7 | Viewed by 12534
Abstract
The complete characterization of two compounds obtained from the acetoneextract of Populus tremula knotwood has been was achieved using LC-DAD-MS,MS/MS, IR and NMR. The new compounds were unequivocally identified as a mixtureof the ester isomers of the (E) and (Z) p-coumarate of 1-O-rutinose. [...] Read more.
The complete characterization of two compounds obtained from the acetoneextract of Populus tremula knotwood has been was achieved using LC-DAD-MS,MS/MS, IR and NMR. The new compounds were unequivocally identified as a mixtureof the ester isomers of the (E) and (Z) p-coumarate of 1-O-rutinose. The isomers showedthe capacity to inhibit lipid peroxidation induced by tert-butylhydroperoxide and to trapperoxyl radicals, as determined by a chemiluminescence method. These new phenyldisaccharides also showed a significant ORAC (oxygen radical absorbance capacity)value, i.e. 11.7 μM TE (Trolox Equivalents). Full article
(This article belongs to the Special Issue Phenolics and Polyphenolics)
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