Effect of pretreatment on pyrolysis-field ionization mass spectrometric data of (4-O-methyl-d-glucurono)-d-xylan from beech wood
✍ Scribed by Ivan Šimkovic; Juraj Alföldi; Hans-Rolf Schulten
- Book ID
- 103983759
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 590 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0961-9534
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✦ Synopsis
The thermal degradation of (4-O-methyl-D-glucurono)-D-xylan in the Na + and H + form as well as the water-soluble fraction of this material before and after hydrolysis was studied by pyrolysis-field ionization mass spectrometry (Py-FIMS). Results indicated the presence of 2-furaldehyde, f-furoic acid, 1,4: 2,3-dianhydro-D-pentose and/or other C,H,O, compounds, 5-hydroxymethyl-2-furaldehyde, 1,4anhydro-D-pentose, 2,3-butandione, and ions m/z 164 (C,H,,O,) and 192 (C,H,207), the exact chemical nature of which are unknown. Structure C,H,,O, was formed from the Na+ form to a greater degree than from the H + form. The acidic form of xylan showed two maxima of 2-furoic acid formation at 300 and 335°C in comparison to one at 330°C for material in the Na+ form and the soluble fraction. The Py-FI mass spectrum of hydrolyzed material did not indicate the presence of a number of compounds observed with non-hydrolyzed material but showed instead peaks at M/Z 73 and 144 which originate from anhydrosugars and compounds typical of the Py-FIMS analysis of monosaccharides. The maximal ion current for hydrolyzed material was at 130°C while for the unhydrolyzed materials the maximum was in the range of 290-330°C.