Figure 7
Raman images of lignin redistribution within M. × giganteus cell walls upon dilute acid pretreatment. a Untreated; b pretreated M. × giganteus at 160°C, 0.5% H2SO4 for 15 min; c pretreated M. × giganteus at 170°C, 1% H2SO4 for 30 min. Sf sclerenchyma fibers, Par parenchyma, Pxv protoxylem vessel, Mxv metaxylem vessel, St sieve tube, Com companion cell.