On-line direct determination of the second virial coefficient of a natural polysaccharide using size-exclusion chromatography and multi-angle laser light scattering.
By combining a size-exclusion chromatographic (SEC) separation and an on-line multi-angle light scattering (MALLS) analysis, we have elaborated an original methodology permitting on-line direct determination of the second virial coefficient of molar mass fractions of polydisperse polysaccharides. By assimilating the SEC-MALLS data to a batch mode acquisition, we have obtained on-line the complete Zimm plot of the eluted fractions, leading to knowledge of their weight-average molar mass Mw, radius of gyration r(g) and second virial coefficient A2. Our methodology was successfully applied to a iota carrageenan sample in LiCl 100 mM, EDTA 1 g/l.
Girod
S
S
Laboratoire Laphal, R&D, Allauch, France. gikos@excite.com
Baldet-Dupy
P
P
Maillols
H
H
Devoisselle
J M
JM
D002850:Chromatography, Gel / Q000379:methods*; D008027:Light; D011134:Polysaccharides / Q000032:analysis*; D012542:Scattering, Radiation
D011134:Polysaccharides