Location, speciation, and quantification of carbon in silica phytoliths using synchrotron scanning transmission X-ray microspectroscopy
Fig 5
X-ray absorption spectra in the carbon K edge.
(Colored) Target spectra were obtained from the linear combination of the eigenspectra of the image stacks measured in the phytolith lamellas (L1–L4) of the present study. (Gray) Reference spectra of protein reported by Zubavichus et al. [48] and of plant cell wall biopolymers lignin, cellulose, and polygalacturonic acid (PGA) reported by Karunakaran et al. [47] after shifting the energy axis (–0.2 eV). Approximate positions of peaks from aromatic (aryl), carboxyl (O = COH), and protein carbonyl (O = CN) groups are marked.