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Catanionic Vesicles Formed With Arginine-Based Surfactants and 1,2-dipalmitoyl-sn-glycero-3-phosphate Monosodium Salt

Catanionic Vesicles Formed With Arginine-Based Surfactants and 1,2-dipalmitoyl-sn-glycero-3-phosphate Monosodium Salt

Neus Lozano, Aurora Pinazo, Camillo La Mesa, Lourdes Perez, Patrizia Andreozzi, Ramon Pons

J Phys Chem B. 2009 May 7;113(18):6321-7.

PMID: 19402726

Abstract:

We report on mixing an anionic diacyl phospholipid (1,2-dipalmitoyl-sn-glycero-3-phosphate monosodium salt, DPPA) with either monoacyl and diacyl arginine-based surfactants. These mixtures are part of the rich family of pseudo-triple-chain and pseudo-tetra-chain catanionic mixtures, respectively. Vesicle size and zeta-potential were measured at several mixing ratios. Additional information on counterion binding, vesicle size, and integrity was obtained from ion selective electrode and Cryo-TEM measurements. Addition of positively charged surfactants to DPPA results in an increase of vesicle size. However, zeta-potential shows different trends, depending on whether water or acid media are used as solvent. In the latter, zeta-potential values progressively approach 0 upon addition of amino acid based surfactants. In water, surprisingly, zeta-potential values become more negative. The results are discussed in terms of modifications in counterion binding and vesicle size.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP169051609	1,2-Dipalmitoyl-sn-glycero-3-phosphate monosodium salt		169051-60-9	Price

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