自然霉变热处理竹材的真菌种属及化学组分分析OA

Bamboo,as a natural biomass material with abundant availability,is widely valued for sustainable applications.However,researchers and manufacturers have observed that even bamboo subjected to high-temperature heat treatment can still suffer from significant mold growth in practical use.To investigate the changes in fungal species and chemical composition associated with this phenomenon,this study examined the morphological characteristics,microstructure,fungal communities,chemical components,pH,and starch content of both untreated and heat-treated bamboo exposed to natural environmental conditions.Moso bamboo was used as the raw material,and heat treatments were applied at 160,180,200,and 220℃for 2 h,respectively.The results showed that,the mildew degree of heat-treated bamboo gradually decreased with the increase of heat treatment temperature,and the mildew phenomenon was almost invisible to the naked eye with the temperatures of 200 and 220℃.The fungi in all the samples mainly included Aspergillus,Penicillium,Wallemia,etc.,in which the most dominant genera were Aspergillus,and its relative abundance also increased with the increase of heat treatment temperature.However,the relative abundance of the subdominant groups of Penicillium and Wallemia decreased with the increase of the heat treatment temperature.In untreated bamboo,mold-induced degradation primarily affected cellulose,whereas in heat-treated bamboo,hemicellulose degradation was more pronounced.However,the degradation of arabinose and clathrin was negligible in both untreated and heat-treated bamboo samples.The pH values of the untreated bamboo and heat-treated bamboo(200 and 220℃)decreased after the natural molding and the acidity was slightly enhanced,while the pH value of heat-treated bamboo(160 and 180℃)increased.The starch content of heat-treated bamboo showed a decreasing trend with the increase of treatment temperature,and all of them were lower than that of the untreated bamboo.The consumption of starch in untreated bamboo by mold was significantly higher than that in all heat-treated bamboo samples,indicating that mold had less damage to starch in high-temperature heat-treated bamboo.In this study,the morphological characteristics,microstructure,mold species,starch content,pH,and chemical components of heat-treated bamboo exposed to natural environmental conditions at different temperatures were observed and analyzed.This study aimed to investigate the mold behavior of high-temperature heat-treated bamboo,reveal the influence of heat-treatment temperature on natural mold development,and provide a theoretical basis for mold prevention.Ultimately,these insights are expected to enhance the performance and broaden the application scope of heat-treated bamboo in various fields.