Potential of NMR relaxometry to unravel the properties of mucilage in several pore sizes
Potential of NMR relaxometry to unravel the properties of mucilage in several pore sizes
复制标题
核磁共振弛豫测定法在揭示多种孔径的粘液特性方面的潜力
DOI：
10.1016/j.geoderma.2019.01.013
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发表时间：
2019
期刊：
影响因子：
6.1
通讯作者：
Schaumann GE
中科院分区：
文献类型：
--
作者：
Brax M;Köhne M;Kroener E;Schaumann GE
土壤中的分泌物如粘液会影响土壤的物理化学性质。在孔隙尺度上的胶浆的凝胶特性的表征是必要的，以获得机械的理解，导致土壤性质的变化的基本过程。然而，粘液的固有性质使其原位检测变得复杂。用1H核磁共振（NMR）弛豫法测量纵向和横向磁弛豫速率具有研究粘液-水相互作用的潜力，因为它们对生物水凝胶中水质子的受限分子运动敏感。然而，水分子在多孔介质中的迁移率与生物水凝胶性质之间的关系至今仍不清楚，本研究采用1H NMR弛豫法系统地研究了水分子在多孔介质中的迁移率。使用奇亚籽粘液，因为它具有土壤中发现的一系列生物水凝胶所共有的水凝胶性质。采用不同粒径的玻璃微珠，研究了孔径对核磁共振信号的影响，并基于多孔介质中水质子弛豫方程建立了一个概念模型，将凝胶效应与核磁共振参数相结合。增加的刚性的聚合物网络和它的组织在孔隙空间中，这取决于颗粒大小和粘液浓度，被评估为凝胶效应显着影响体积松弛。我们的方法，结合使用核磁共振沿着与其他成像方法，是一个有前途的战略，以检测和表征多孔介质中的生物水凝胶的性质。
Soil-born exudates such as mucilage are known to affect soil physicochemical properties. Characterization of the gel properties of mucilage at the pore-scale is necessary to gain mechanistic understanding of the underlying processes leading to changes of soil properties. Yet, mucilage intrinsic properties' complicate itsin-situdetection. Longitudinal and transverse magnetic relaxation rates measured with1H Nuclear Magnetic Resonance (NMR) relaxometry have the potential to study mucilage-water interactionsin-situas they are sensitive to restricted molecular motion of water protons in biohydrogels. However, the relations between water mobility and biohydrogel properties in porous media have remained unknown until now.In this study, the mobility of water molecules in chia seed mucilage in porous systems was systematically investigated by means of1H NMR relaxometry. Chia seed mucilage was used as it has hydrogel properties shared by a range of biological hydrogels found in soil. Glass beads of several sizes were used to study the influence of the pore size on the NMR signal.A conceptual model based on the equations describing the relaxation of water protons in porous media was developed to integrate these gel effects into the NMR parameters. The increased rigidity of the polymer network and its organization in the pore space, which depended on the particle size and the mucilage concentration, were assessed as the gel effects significantly affecting the bulk relaxation. Our approach, which combines the use of NMR along with other imaging methods, is a promising strategy to detect and characterize the properties of biohydrogel in porous media.
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影响因子：
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作者：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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