葡聚糖 来源于肠系膜明串珠菌

(C₆H₁₀O₅)_n

232-677-5

MFCD00130935

NA.24

Dextrans are polysaccharides with molecular weights ≥1,000 Dalton, with a linear backbone of α-linked D-glucopyranosyl repeating units. Dextrans are found as bacterial extracellular polysaccharides. They are synthesized from sucrose by Leuconostoc mesenteroides and Lactobacillus brevis. Bacteria employ dextran in biofilm formation or as a protective coating to evade host phagocytes in the case of pathogenic bacteria.
Dextran from Leuconostoc mesenteroides (Mw: 25,000) may be used as an analytical standard to calibrate the column for gel permeation chromatography (GPC).
Dextran is a D-glucosyl homopolysaccharide which has a-1,6 glucosidic linkages with different branches through α-1,2, α-1,3, and α-1,4 linkages correspondingly classified as group A, B and C. It can be synthesized from sucrose by cell-free filtrate.

Markers-dextran with 25000 Da has been used as standard in gel chromatography analysis to determine fractional composition of protein, carbohydrate, phenolic surface active substances in base wine.
将右旋糖酐用作长的亲水性间隔臂提高了作用于大分子的固定化蛋白质的性能。

analytical standard
for GPC

100

M_n ~20,000
M_p ~20,000
M_w ~25,000

oligosaccharides

gel permeation chromatography (GPC): suitable

~1.25

food and beverages

neat

13 - Non Combustible Solids

WGK 2

Eyeshields, Gloves, type N95 (US)