Effects of counterions on molecular transport across liposome bilayer

Probed by second harmonic generation

Xiaoming Shang, Yan Liu, Elsa Yan, Kenneth B. Eisenthal

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The transport rate of an organic cation, malachite green (MG), across a unilamellar bilayer (∼105 nm) of the dioleoylphosphatidylglycerol (DOPG) liposome has been studied by the SHG technique. This is the first time to our knowledge that the effects of anions on molecular cation transport have been observed. Our studies show four results. First, in the presence of sodium chloride (NaCl) or sodium bromide (NaBr), the time constant for transport of MG across the DOPG bilayer increases with the increase in the concentration of the counterion (i.e., Cl- or Br-). Second, with the organic electrolytes, sodium citrate (NaCitrate) and sodium ethanesulfonate (NaEtSO3), the transport rate is independent of the concentration of the counterion (i.e., Citrate- and EtSO3-). Third, at the same counterion concentration, the transport rate depends on the species of the counterion used. The rate of MG transport is the slowest with Cl-, taster with Br-, and the fastest with the two organic counterions, Citrate- and EtSO3-. Last, at the low counterion concentration of 1mM, the transport rates of MG were found to approach the same value for the four anions. A brief discussion of a possible mechanism is presented.

Original languageEnglish
Pages (from-to)12816-12822
Number of pages7
JournalJournal of Physical Chemistry B
Volume105
Issue number51
DOIs
Publication statusPublished - Dec 27 2001

Fingerprint

Liposomes
Harmonic generation
harmonic generations
Sodium
citrates
Negative ions
Positive ions
Citric Acid
Anions
Cations
Sodium chloride
sodium
sodium bromides
anions
cations
Electrolytes
Sodium Chloride
sodium chlorides
time constant
low concentrations

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Effects of counterions on molecular transport across liposome bilayer : Probed by second harmonic generation. / Shang, Xiaoming; Liu, Yan; Yan, Elsa; Eisenthal, Kenneth B.

In: Journal of Physical Chemistry B, Vol. 105, No. 51, 27.12.2001, p. 12816-12822.

Research output: Contribution to journalArticle

Shang, Xiaoming ; Liu, Yan ; Yan, Elsa ; Eisenthal, Kenneth B. / Effects of counterions on molecular transport across liposome bilayer : Probed by second harmonic generation. In: Journal of Physical Chemistry B. 2001 ; Vol. 105, No. 51. pp. 12816-12822.
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