异硫氰酸荧光素-葡聚糖

一般描述

右旋糖酐是一种无水葡萄糖的聚合物。 由大约95%的α-D-(166)键组成。 其余的 a (163) 键合解释了葡聚糖的分支。分支长度上的冲突数据意味着平均分支长度小于 3 个葡萄糖单位。但是，其他方法表明存在大于 50 个葡萄糖单位的分支。已发现天然右旋糖酐的分子量 (MW) 在 900 万至 500 万范围内。较低分子量的右旋糖酐将表现出略微较少的支化 ，并具有更窄的分子量分布范围。分子量大于10,000 的葡聚糖似乎是表现为高度支化的。 随着分子量的增加，葡聚糖分子

应用

FITC-葡聚糖被广泛用于利用微荧光法对微循环和细胞渗透性的研究。 FITC-葡聚糖已用于研究植物细胞壁的孔隙率和毛细管渗透性。血浆蛋白已被显示不可与FITC-葡聚糖进行结合。 FITC-葡聚糖已用于心血管、微循环、灌注细胞单层和细胞膜通透性研究，作为可支持对血流、膜损伤、血管引流和肾脏消除等过程进行测量的荧光通量示踪剂化合物。 小的FITC-葡聚糖已用于对内吞作用和细胞连接渗透性等过程进行测量。 5kDa的FITC-葡聚糖可用于对微尺度扩散测量进行校准。 5kDa的FITC-葡聚糖可用于在肠屏障功能障碍研究中对肠道通透性进行测量。 用异硫氰酸荧光素标记的葡聚糖可用于动物的灌注研究。

制备说明

通常在水中以25 mg/ml或更低的浓度对FITC葡聚糖的溶解度进行检测。 溶液应当避光保存。 FITC-葡聚糖在体外可稳定超过24小时。

General Description

Dextran is a polymer of anhydroglucose. It is composed of approximately 95% alpha-D-(166) linkages. The remaining (163) linkages account for the branching of dextran. Conflicting data on the branch lengths implies that the average branch length is less than three glucose units. However, other methods indicate branches of greater than 50 glucose units exist. Native dextran has been found to have a molecular weight (MW) in the range of 9 million to 500 million. Lower MW dextrans will exhibit slightly less branching and have a more narrow range of MW distribution. Dextrans with MW greater than 10,000 behave as if they are highly branched. As the MW increases, dextran molecules attain greater symmetry. Dextrans with MW of 2,000 to 10,000, exhibit the properties of an expandable coil. At MW below 2,000, dextran is more rod-like. The MW of dextran is measured by one or more of the following methods: low angle laser light scattering, size exclusion chromatography, copper-complexation and anthrone reagent colorometric reducing-end sugar determination and viscosity.

Application

FITC-dextran is used extensively in microcirculation and cell permeability research utilizing microfluorimetry. FITC-dextran has been used to study plant cell wall porosity and capillary permeability. Plasma proteins have been shown not to bind to FITC-dextran. FITC-dextran is used in cardiovascular, microcirculation, perfusion, cell monolayer and cell membrane permeability research as fluorescent flux tracer compound that supports the measurement of processes such as blood flow, membrane damage, vascular drainage and renal elimination. Small FITC-dextrans are also used to measure processes such as endocytosis and cell junction permeability. 5kDa FITC-dextran may be used to calibrate microscale diffusion measurements. 5kDa FITC-dextran may be used to measure gut permeability in gut barrier dysfunction research. Dextran labeled with fluorescein isothiocyanate for possible use in perfusion studies in animals.