title: Feasibility of using atmospheric pressure matrix-assisted laser desorption/ionization with ion trap mass spectrometry in the analysis of acetylated xylooligosaccharides derived from hardwoods and Arabidopsis thaliana.
abstract: The atmospheric pressure matrix-assisted laser desorption/ionization with ion trap mass spectrometry (AP-MALDI-ITMS) was investigated for its ability to analyse plant-derived oligosaccharides. The AP-MALDI-ITMS was able to detect xylooligosaccharides (XOS) with chain length of up to ten xylopyranosyl residues. Though the conventional MALDI-time-of-flight/mass spectrometry (TOF/MS) showed better sensitivity at higher mass range (>m/z 2,000), the AP-MALDI-ITMS seems to be more suitable for detection of acetylated XOS, and the measurement also corresponded better than the MALDI-TOF/MS analysis to the actual compositions of the pentose- and hexose-derived oligosaccharides in a complex sample. The structures of two isomeric aldotetrauronic acids and a mixture of acidic XOS were elucidated by AP-MALDI-ITMS using multi-stages mass fragmentation up to MS(3). Thus, the AP-MALDI-ITMS demonstrated an advantage in determining both mass and structures of plant-derived oligosaccharides. In addition, the method of combining the direct endo-1,4-β-D-xylanase hydrolysis of plant material, and then followed by AP-MALDI-ITMS detection, was shown to recognize the substitution variations of glucuronoxylans in hardwood species and in Arabidopsis thaliana. To our knowledge, this is the first report to demonstrate the acetylation of glucuronoxylan in A. thaliana. The method, which requires only a small amount of plant material, such as 1 to 5 mg for the A. thaliana stem material, can be applied as a high throughput fingerprinting tool for the fast comparison of glucuronoxylan structures among plant species or transformants that result from in vivo cell wall modification.
authors: Department of Food and Environmental Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland. sun-li.chong@helsinki.fi
authors: Sun-Li
authors: SL
authors: Chong
authors: Teemu
authors: T
authors: Nissilä
authors: Raimo A
authors: RA
authors: Ketola
authors: Sanna
authors: S
authors: Koutaniemi
authors: Marta
authors: M
authors: Derba-Maceluch
authors: Ewa J
authors: EJ
authors: Mellerowicz
authors: Maija
authors: M
authors: Tenkanen
authors: Päivi
authors: P
authors: Tuomainen
mesh_terms: D000107:Acetylation; D017360:Arabidopsis / Q000737:chemistry*; D001274:Atmospheric Pressure; D001709:Biotechnology / Q000379:methods*; D002240:Carbohydrate Sequence; D002473:Cell Wall / Q000737:chemistry; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism; D057166:High-Throughput Screening Assays; D007477:Ions; D007536:Isomerism; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000032:analysis* / Q000737:chemistry; D010936:Plant Extracts / Q000032:analysis* / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D014574:Uronic Acids / Q000032:analysis / Q000737:chemistry; D014934:Wood / Q000737:chemistry*; D014990:Xylans / Q000032:analysis / Q000737:chemistry; D014994:Xylose / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry
chemical_list: D007477:Ions; D009844:Oligosaccharides; D010936:Plant Extracts; D014574:Uronic Acids; D014990:Xylans; C431715:xylopyranose; C038910:glucuronoxylan; D014994:Xylose; D043364:Endo-1,4-beta Xylanases