Add time:09/10/2019         Source:sciencedirect.com

Arsenazo III-loaded liposomes are in wide use as model systems in the study of Ca2+ transport. The most sophisticated method for quantitation of Ca2+ uptake [E. B. Smaal et al. (1985) Biochim. Biophys. Acta 816, 418] utilizes the absorbance changes (650–700 nm) elicited by sequential additions of EDTA and A23187 to distinguish Ca2+-Arsenazo complexes which are outside and inside the liposomes. In this paper, the analytical approach of Smaal and co-workers is reevaluated and a straightforward treatment that allows calculation both of the concentration of Ca2+ inside liposomes and of total Ca2+ uptake (in moles/mole phospholipid) is developed.

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