FITC-lysine-dextran is a derivative carrying both free primary amines and free carboxylates as well as the fluorescent dye Fluroescein (FITC). Lysine is a naturally occurring amino acid and popular moiety for conjugation and fixation in biochemistry and life sciences.
FITC-lysine-dextran is also known as Fluoro-emerald® or fluoroemerald ®. After purification, all batches are checked for molecular weight, degree of substitution, loss on drying and free FITC. FITC-lysine-dextrans are supplied by TdB Labs as a yellow to orange powder TdB Labs with a molecular weight from 4 kDa to 500 kDa.
Fluorescein (FITC) is a bright dye that is used world-wide and absorbs at 493 nm and emits light at 520 nm.
Our high quality FITC-lysine-dextran offer:
Excellent molecular weight distribution (low polydispersity)
Fixability in cells and tissue
Easy conjugation to dyes or biomolecules
Fully water soluble and excellent stability in solution or on the shelf
Can’t find what you are looking for? We can always produce a customised product for you. Read more here.
FITC-lysine-dextrans are synthesised from well-characterised dextran fractions derived from Leuconostoc mesenteroides. The dextran fractions are first labelled with lysine and thereafter functionalised with FITC under mild conditions to form FITC-lysine-dextran. The degree of substitution of lysine is 0.005-0.03 (mol lysine/mol glucose) and the degree of substitution of FITC is 0.001-0.01 (mol FITC/mol glucose).
The excitation maximum for FITC-lysine-dextran is 493 nm and the emission maximum is 520 nm.
Storage and stability
FITC-lysine-dextran is stable for more than 6 years when stored dry in well-sealed containers at ambient temperature.
FITC-lysine-dextran dissolves readily in water.
Visit our webshop to see the molecular weights and pack sizes available. Please send an e-mail to firstname.lastname@example.org if you would like to receive a quote, place a bulk order or if you wish to place your order manually.