Rapid quantitative determination of the sulphate groups of dextran sulphate

Adsorption of Beta-Blockers onto Poly(isobutylcyanoacrylate) Nanoparticles: Adsorption Model and Dielectric Interpretation

“…In sulfate groups of DS through the formation of an ion pair in water with detection of the equivalent point by dielec-order to support this hypothesis, we have tested other nanoparticle systems whose continuous aqueous phase contained tricity (13).…”

“…This 05 mV zeta potential of nanoparticles prepared have been used in order to determine the level of DS in only with Dextran 70 is only slightly decreased when DS solution (13).…”

“…The principle of the method was described previously (13). Its lower detection limit is 10 04 mol liter 01 of sulfate groups.…”

Determination of heparin in aqueous solutions

“…Classical conductimetry has also been used but the end‐point is not specific as the equivalence point is not obvious. Dielectric permittivity measurements may be a satisfactory way of evaluating the end‐point ( 7).…”

“…An assay based on this and involving dextran sulphate was recently reported for determining the sulphatation level of commercial samples or to control pharmaceutical preparations containing it ( 7). A precipitation reaction analogous to that described by Scott for heparin is used ( 6).…”