Abstract
Ultraviolet absorption spectra were determined microscopically for the different morphological regions of fourteen hardwood species. The woods were chosen to represent a range of methoxyl to carbon nine ratio (MeO/C9) in their lignins. The various trends in absorbance and peak wavelength indicated that 1. Syringyl residues become increasingly predominant in the walls of the fiberes and ray cells as the MeO/C9 ratio of the lignin increases. 2. The vessel walls and cell corner regions contain mostly guaiacyl residues except at high MeO/C9 ratios when the syringyl character of the vessel walls increases. If certain reasonable assumptions were made, it was possible to resolve the spectrum of the fibre wall of eastern cottonwood into spectra of the syringyl, guaiacyl and p-hydroxy benzoic acid components.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
