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Sheets of mica

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Company: Agar Scientific
Catalog#: G250
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Pectin Nanostructure Visualization by Atomic Force Microscopy
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2015-09-20
[Abstract]  Pectins, complex polysaccharides rich in galacturonic acid, are a major component of primary plant cell walls. These macromolecules regulate cell wall porosity and intercellular adhesion, being important in the control of cell expansion and differentiation through their effect on the rheological properties of the cell wall. In fruits, pectin disassembly during ripening is one the main event leading to textural changes and softening. Changes in pectic polymer size, composition and structure have been studied by conventional techniques, most of them relying on bulk analysis of a population of polysaccharides but studies of detailed structure of isolated polymer chains are scarce (Paniagua et al., 2014). Atomic force microscopy (AFM) is a versatile and powerful technique able to ... [摘要]  果胶,富含半乳糖醛酸的复合多糖是主要植物细胞壁的主要成分。这些大分子调节细胞壁孔隙度和细胞间粘附,在通过它们对细胞壁的流变性质的影响来控制细胞扩增和分化中是重要的。在果实中,果胶在成熟期间的拆卸是导致质地变化和软化的主要事件。已经通过常规技术研究了果胶聚合物尺寸,组成和结构的变化,其中大多数依赖于多糖群体的批量分析,但是对分离的聚合物链的详细结构的研究很少(Paniagua等人, >,2014)。原子力显微镜(AFM)是一种通用且强大的技术,能够分析力测量,以及以纳米尺度可视化生物样品的粗糙度(Morris等人,2010)。使用这种技术,最近的研究发现果胶纳米结构复杂性和几种果实的纹理和收获后行为之间的密切关系(Liu和Cheng,2011; Cybulska等人,2014; Pose等。,2015)。在这里,我们描述了AFM程序,以在地形学上可视化来自果实细胞壁提取物的果胶聚合物,其已经成功地用于草莓成熟的研究中(Pose等人,2012; ,2015)。因此,从AFM图像,可以在高放大率和最小的样品制备下分离孤立链(长度,高度和分支模式)的3D结构分析。 AFM基本原理和不同采样模式的完整描述在Morris等人(2010)中描述。

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