异硫氰酸荧光素-葡聚糖

一般描述

葡聚糖是一种无水葡萄糖聚合物。由大约 95% 的α-D-(166)键组成。其余的 a (163) 键构成了葡聚糖的分支。分支长度相互矛盾的数据表明平均分支长度小于 3 个葡萄糖单位。但是，其他方法研究表明存在大于 50 个葡萄糖单位的分支。已发现天然葡聚糖的分子量 (MW) 范围为 900 万至 5 亿。较低分子量的葡聚糖具有略少的支化 ，并具有更窄的分子量分布范围。分子量大于10,000 的葡聚糖似乎是高度分支化的。随着分子量的增加，葡聚糖分子的对称性增强。具有 2,000

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。 用异硫氰酸荧光素标记的葡聚糖可用于动物的灌注研究。 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。70kDa 的 FITC-葡聚糖 （FD-70）可用作开发将分子递送到原生质体中的模型化合物，并研究从水凝胶、脂质体等结构中释放药物的方法。它可用于微血管和细胞单层渗透性研究。

制备说明

通常在水中以 25mg/ml 或更高的浓度对 FITC 葡聚糖的溶解进行检测。溶液应避光保存。FITC-葡聚糖在体内可稳定超过 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. FITC-dextran 70kDa (FD-70) may be used as a model compound for development of methods to deliver molecules into protoplasts and to study drug release from structures such as hydrogels and liposomes. It may be used in microvascular and cell monolayer permeability studies. Dextran labeled with fluorescein isothiocyanate for possible use in perfusion studies in animals.