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The topochemical distribution of lignin in vascular bundles separated from different radial positions of Mexican coconut wood stems ( Cocos nucifera ) has been studied with focus on the relationship between the degree of lignification and tensile strength properties. The cellular lignin distribution was analyzed by UV-microspectrophotometry (UMSP) scanning at 280 nm of sections of vascular bundles (VBs) of 1 μm thickness. The fibers of the VBs with high tensile strength reveal a relatively low UV-absorbance at 280 nm (A 280 nm  0.39), whereas the VBs with low tensile strength display the highest A 280 nm  (0.59). The S 2  of fiber walls are characterized by the typical lamellar structure with increasing lignin contents from the cell lumen towards the compound middle lamellae (CML). The A 280 nm  data of CMLs are higher (0.67 to 0.87) than those of the S 2  wall layers. Overall, the A 280 nm  values of S 2  of fibers walls within single VBs of coconut are in the range of 0.36 to 0.59.

holzforschung

Distribution of lignin in vascular bundles of coconut wood ( Cocos nucifera ) by cellular UV-spectroscopy and relationship between lignification and tensile strength in single vascular bundles