【摘要】 为了研究小麦茎秆纤维素与小麦茎秆抗倒伏性之间的关系,采用微波辅助加热酸浸提法提取了小麦茎秆纤维素,通过光学显微镜、扫描电子纤维镜(SEM)、傅里叶红外光谱(FTIR)、X-射线衍射光谱法(XRD)等方法对小麦茎秆纤维素光谱性能和形貌结构进行了表征。结果表明:抗倒伏小麦百农矮抗58茎秆纤维素含量为22.51%,结晶度高达74.47%;微波辅助加热酸浸提法所提取的小麦茎秆纤维素纯度高,具有典型的纤维素特征,小麦茎秆纤维素结晶体具有典型的纤维素Ⅰ的结构;小麦茎秆纤维素结构属结晶度高、大分子排列非常紧密的纤维;小麦茎秆纤维素的结晶度和小麦茎秆的倒伏指数具有一定的相关性,结晶度高,倒伏指数小,抗倒伏性能强;结晶度可以用来表征小麦茎秆纤维素的强度,有望作为衡量小麦茎秆质量的重要指标之一。更多还原

【Abstract】 The relationship between cellulose and lodging resistance of wheat straw was studied in the paper.The cellulose was extracted from wheat straw by using microwave-assisted and acetic acid/nitric acid /water system.The structure and morphology of cellulose was characterized by means of fluorescent microscopy,fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD) and scanning electronic microscopy(SEM).The results of XRD showed that the crystallite of cellulose from wheat straw was typical of celluloseⅠ,which was the perfect microfibrillar structure.For the very popular variety BN AK58,the content of cellulose in straw was as high as 22.51%,and crystallinity was 74.47%.The cellulose in wheat straw had high crystallinity,high orientation degree and tight structure.A significant inverse correlation between lodging index and crystallinity of straw cellulose was found.The crystallinity of cellulose could be used to characterize the strength of straw cellulose,and might also be taken as one of indices for judging the quality of wheat straw.更多还原