Abstract
Bast ribbons from Tainung 1 (T 1 ) and Guatemala 45 (G 45 ) cultivars of kenaf (Hibiscus cannabinus) were subjected to a chemical retting process. The resulting changes at the base and tip regions of each cultivar were analysed using solid-state 13 C NMR and diffuse reflectance mid-infrared spectroscopies. Chemical retting was performed by boiling the substrates in NaOH (70 g litre -1 ) + NaHSO 3 (5 g litre -1 ) for 1 h, after which they were neutralised, washed and air dried. This process produced large decreases in the non-cellulosic components, though 25% of the phenolic component was left undegraded, and cellulose crystallinity was increased by ∼5% over that in unretted samples.
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