A. Delamaza et al., MULTILAMELLAR LIPOSOMES INCLUDING CHOLESTEROL AS CARRIERS OF A 1 2 METAL-COMPLEX DYE IN WOOL DYEING/, Textile research journal, 67(5), 1997, pp. 325-333
Studies are described of the use of multilamellar lipid vesicles (MLV)
of defined size (400 nm) containing increasing amounts of cholesterol
(CH) as carriers of a 1:2 metal complex dye to untreated wool fibers.
We investigate liposomes made from egg phosphatidylcholine (pc) conta
ining the CI Acid Yellow 129 dye (weakly polar 1:2 metal complex dye)
at PC:CH molar ratios ranging from 10:0 to 6:4. The total lipid concen
tration of liposomes and the dye concentration remain constant (1.25 m
mol and 1% owf, respectively). The physical stability of these systems
is assessed by measuring the mean vesicle size distribution of the ve
sicle suspensions after preparation and during the dyeing process. Kin
etic aspects involving dye adsorption and bonding on untreated wool sa
mples by means of these liposomes are also investigated. This process
leads to the controlled exhaustion of dye in wool samples, which depen
ds on the liposome lipid composition. Increasing amounts of CH in bila
yers result in a progressive rise in both dye exhaustion and total amo
unts of dye bonded to wool fibers. The diffusion properties of wool fi
bers as well as the smoothness of the dyed samples, given as a measure
of their handle, also improve.