Treatment of sugi (Cryptomeria japonica D.) sapwood with aqueous solution of acetic acid

Abstract

Sugi sapwood samples were processed with aqueous solution of acetic acid in order to find the response of the weight of sugi sapwood and the treatment of aqueous solution of acetic acid. The result showed that loss of weight for the treated sugi sapwood was about equal to yield of extracts from sugi sapwood, and increased with the increment of the concentration of aqueous solution of acetic acid. Fourier transform infrared spectroscopy spectra changes of the treated sugi wood and extracts from sugi sapwood were analyzed by FT-IR spectroscopic technique. Increasing tendency of absorption intensities of the stretching vibration at 3 400 cm⁻¹ of hydroxyl group (OH) and C=C in lignin stretching vibration at 1510 cm⁻¹ of benzene ring in lignin were observed from FT-IR of the treated sugi sapwood. From FT-IR spectra of extracts from sugi sapwood by aqueous solution of acetic acid, the dissolution of lignin was observed during the treatment with 30% acetic acid solution aqueous.