“…Applications of IR spectroscopic methods in cellulose analysis in both isolated state and plant cell wall (PCW) were discussed by Makarem et al (2019) . There were also some reviews about IR imaging of polysaccharides in PCW ( Gierlinger, 2018 , Kumar et al, 2016 , Wu et al, 2019 ). However, these papers are more specific to only one application filed rather than comprehensive.…”