茴香及其秸秆膳食纤维的组成成分、结构与物化功能特性

目的：明确茴香及其秸秆膳食纤维的组成成分、结构、物化及功能特性。方法：采用剪切乳化辅助酶解法提取茴香及其秸秆膳食纤维,通过AOAC法、离子色谱、X-射线衍射、扫描电子显微镜、傅里叶红外光谱分析其组成成分及结构,并对其保水能力、吸水膨胀性、持油能力以及葡萄糖吸收能力、α-淀粉酶活性抑制能力和胆汁酸阻滞指数等进行测定。结果：茴香及其秸秆膳食纤维的纯度分别为84.76%和78.73%,均由纤维素、半纤维素、果胶和木质素构成,并含有鼠李糖、阿拉伯糖、半乳糖、葡萄糖和木糖;茴香膳食纤维具有多孔网状结构,而秸秆膳食纤维呈块状,均有纤维素晶区和特征基团;茴香秸秆膳食纤维的保水能力、吸水膨胀性和持油能力（6.91 g/g,6.77 m L/g和6.99 g/g）优于茴香膳食纤维（5.91 g/g,5.70 m L/g和6.47 g/g）,而茴香膳食纤维的葡萄糖吸收能力、α-淀粉酶活性抑制能力和胆汁酸阻滞指数（18.23%,3.05-34.58 mmol/g和32.94%~34.65%）显著高于茴香秸秆膳食纤维（13.49%,1.39~15.63 mmol/g和13.12%~23.44%）。结论：茴香及其秸秆膳食纤维均具有稳定的结构,良好的物化特性及功能特性,可作为一种新型的膳食纤维产品进行开发利用。

Membrane nanotubes:Novel communication between distant cells

The many kinds of cell structures involved in cell-cell communication include tight junction,adherens junction and gap junction,but almost all are between adjacent cells.Recently,a general and dynamic membrane tether,termed tunneling nanotubes or membrane nanotubes(MNTs),was discovered to be involved in communication between distant cells.By facilitating intercellular communication,MNTs contribute to many biological functions and pathologic changes in cells.Many works have revealed the structure,formation and functional properties of MNTs.However,as novel structures,further research is needed.