Cornhusk fiber is a kind of biodegradable lignocellulosic fiber. The conditions of enzyme and NaOH retting were optimized on the basis of weight loss rate and the Fried test score to extract the cornhusks fiber. Taking raw cornhusk fiber as a contrast, physicochemical properties of the fiber extracted from cornhusk was researched in detail by chemical analysis (GB5889-86), X-ray diffraction and Fourier-transform infrared spectroscopy (FTIR). The optimal retting condition of cornhusk fiber is the following: Pectinase 9032 0.5% concentration, at 40–55°C, pH 4.2–5.8, and then 5% NaOH treatment for 15 min. The crystallinity index of raw cornhusk fiber, enzyme-treated cornhusk fiber and enzyme-alkali-treated cornhusk fiber are 20.30%, 35.05% and 51.00%, respectively, and the structure of these fibres all correspond to cellulose I. The FTIR spectra showed that higher amounts of lignin and hemicellulose were removed by NaOH treatment compared with enzyme treatment.
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