Figure 2

Representative UV spectra of individual cell walls (S2) of untreated sugar-cane, showing (A) rind and (B) pith S2, respectively. At least five spectra were recorded from each different cell type. The average spectra are shown in this figure. Standard deviations, calculated from the absorbance values measured at the wavelength of maximal absorption, were in the range of 5%, 13% and 25% for fiber, vessel and parenchyma cells, respectively.