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聚合物。由约 95% 的 α-D-(166) 键组成。其余 (163) 连接可解释右旋糖酐的分支。分支长度的冲突数据表明平均分支长度小于 3 个葡萄糖单位。然而，其他方法表明存在超过 50 个葡萄糖单位的分支。已发现天然右旋糖酐分子量 (MW) 在 900 万 ～5 亿范围内。较低分子量的右旋糖酐将表现出略少的分支，并且分子量分布范围更窄。分子量大于 10,000 的右旋糖酐表现得好像它们是高度支链。随着分子量的增加，葡聚糖分子的对称性增强。分子量为 2,00

应用

FITC-右旋糖酐利用显微荧光法广泛用于微循环和细胞渗透性研究。FITC-右旋糖酐已被用于研究植物细胞壁多孔性和毛细管渗透性。已证明血浆蛋白不与 FITC-右旋糖酐结合。 FITC-右旋糖酐作为荧光通量示踪化合物用于心血管、微循环、灌注、细胞单层和细胞膜渗透性研究，支持血流、膜损伤、血管引流和肾脏消除等过程的测量。小的 FITC-右旋糖酐也用于测量细胞内吞和细胞连接通透性等过程。荧光素-葡聚糖，20 kDa，可用于研究细胞过程，如内吞和渗透压。FITC-右旋糖酐-20 可用于研究内皮细胞或上皮细胞单层孔隙度、细胞层内顶端基底侧运动和细胞连接渗透性。FITC-右旋糖酐-20 可作为研究氢原子和胶原微棒等结构药物释放的模型化合物。 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

通常检测浓度等于或高于 25 mg/mL 的 FITC 葡聚糖在水中的溶解度。溶液应避光保存。在体内，FITC-右旋糖酐可稳定 24 小时以上。

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. Fluorescein-dextran, 20 kDa, may be used to study cell processes such as endocytosis and osmoporation. FITC-dextran-20 may be used to study endothelial or epithelial monolayer porosity, apical-basolateral movements within cell layers and cell junction permeability. FITC-dextran-20 may be used as a model compound to study drug release from structures such as hydrogens and collagen minirods. Dextran labeled with fluorescein isothiocyanate for possible use in perfusion studies in animals.