XPS and FTIR studies of fungus-stained Daemonorops margaritae  

作　　者：Wenhua Lyu Yuan Shi Yaxian Zheng Xing'e Liu 

机构地区：[1]Research Institute of Wood Industry, Chinese Academy of Forestry [2]International Centre for Bamboo and Rattan

出　　处：《Journal of Forestry Research》2019年第2期739-743,共5页林业研究（英文版）

基　　金：supported by the National Key Project of S&T Supporting Programs Funded by MOST of China during the 12th Five-year Plan(No.2012BAD23B0104)

摘　　要：We explored the discoloration of rattan cane using X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FTIR). XPS analysis showed that after the cane was stained by Lasiodiplodia theobromae, carbon and oxygen elements and the ratio of oxygen to carbon decreased. Considering atomic binding,C_1 and C_4 contents increased, while C_2 and C_3 contents decreased, and the ratio of O_2 to O_1 decreased sharply. The relative contents of lignin, cellulose and polysaccharides increased and new substances with low O_2/O_1 ratio occurred. FTIR analysis showed that the absorption peaks of O–H at 3346 cm^(-1), aliphatic C–H at 2921, 2853 and1464 cm^(-1), and C=O at 1723 cm^(-1), were characteristic peaks of fungal melanin intensified, indicating that cane discoloration was primarily caused by fungal melanin. The absorption peaks characterizing cellulose and lignin like polysaccharides at 800 cm^(-1), C–H at 1374 cm^(-1), C–O at1058 and 1038 cm^(-1), phenolic hydroxyl at 1245 cm^(-1),aromatic ether bonds at 1270 cm^(-1), carbon skeleton at1608 cm^(-1) and benzene ring at 1500 cm^(-1) were enhanced since the fungus mainly consumed the extractives in cane cell lumens and the main composition content increased relatively. Regardless of the discoloration caused by natural fungi or inoculated fungi, the discoloring feature and composition changes were identical except that the fungusinoculated cane had more melanin.We explored the discoloration of rattan cane using X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FTIR). XPS analysis showed that after the cane was stained by Lasiodiplodia theobromae, carbon and oxygen elements and the ratio of oxygen to carbon decreased. Considering atomic binding,C_1 and C_4 contents increased, while C_2 and C_3 contents decreased, and the ratio of O_2 to O_1 decreased sharply. The relative contents of lignin, cellulose and polysaccharides increased and new substances with low O_2/O_1 ratio occurred. FTIR analysis showed that the absorption peaks of O–H at 3346 cm^(-1), aliphatic C–H at 2921, 2853 and1464 cm^(-1), and C=O at 1723 cm^(-1), were characteristic peaks of fungal melanin intensified, indicating that cane discoloration was primarily caused by fungal melanin. The absorption peaks characterizing cellulose and lignin like polysaccharides at 800 cm^(-1), C–H at 1374 cm^(-1), C–O at1058 and 1038 cm^(-1), phenolic hydroxyl at 1245 cm^(-1),aromatic ether bonds at 1270 cm^(-1), carbon skeleton at1608 cm^(-1) and benzene ring at 1500 cm^(-1) were enhanced since the fungus mainly consumed the extractives in cane cell lumens and the main composition content increased relatively. Regardless of the discoloration caused by natural fungi or inoculated fungi, the discoloring feature and composition changes were identical except that the fungusinoculated cane had more melanin.

关 键 词：RATTAN CANE FUNGAL stain FUNGAL MELANIN FTIR XPS 

分 类 号：S[农业科学]