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Premium Quality Dextran Derivatives

Using TdB’s premium products with narrow fractions (low PD) will give you reliable and reproducible results.

Looking for an expert on Dextran Derivatives? We produce, analyse and develop custom products for your project.

About us

TdB Consultancy AB is a Swedish biotech company specialized in the development and manufacturing of dextran derivatives. In addition, we have expertise in most aspects of polysaccharide chemistry. This includes not only synthesis but also chemical and physical characterization; our latest addition is a GPC system equipped with light-scattering, viscosity and refractive index detection.

We specialize particularly in the synthesis of fluorescent derivatives of polysaccharides. We offer derivatives labelled with FITC, TRITC, ATTO™-dyes and our proprietary Antonia Red™-dye. Our portfolio consists of more than 30 product groups, of which 20 are fluorescent.

For a presentation of intravital studies using fluorescent dextrans pdfclick here.


All products from TdB Consultancy are of premium quality. Our polysaccharide derivatives have a low polydispersity (PD) and high purity. This is especially important for permeability studies; a low PD gives much more reliable and reproducible result. Using TdB Consultancy products will help our customers achieve their research goals.

All our standard products are of technical grade. Please contact us  if you are interested in products of higher purity. Possible applications of high purity products are for example as part of medical devices. You can read more about our custom specific products here.


Our products are employed widely in Life Sciences ranging from permeability studies, cell preservation, animal studies to applications in processing of clinical products. Dextrans are also used in diagnostic kits and as molecular markers.


2019-05-22: Read our latest newsletter!

Read our latest newsletter and learn more about our premium quality dextran derivatives with low polydispersity!
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2019-04-18: Easter holiday

TdB Consultancy will be closed during the Easter holiday from 19th of April until 22nd of April.
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2019-02-18: New distributor in South Korea

We are pleased to present Kim & friends Inc. as our new distributor in South Korea!
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High quality analysis of your substance

We can now offer a series of analyses specific to charged and uncharged dextran and Polysucrose derivatives. This includes molecular weight determination using GPC (gel permeation chromatography), determinations of degrees of substitution for dextran sulfates.

Read more here

Let us develop and produce your customized product

An important part of our services comprises the development and production of customised products. This entails not only chemical synthesis but also Quality Control aspects; Specifications, Analytical methods, SDS, biological assays and stability.

Read more here
FITC-dextran 4 (FD4)

FITC-dextran 4 (FD4)

The product is a yellow powder which is readily soluble in water. The limits for the molecular weight are 3 000 -5 000 as measured by SEC. The degree of substitution is between 0.003 -0.008.

677 SEK
Fact Value
Catalog no. FD4
Availability In stock
Mol.wt 3000-5000
Emission 520 nm
Absorbance 493 nm