flavanoids, natural colourants such as anthocyanins and natural
aroma compounds such as terpenes and esters [1,2]. Grape seed
oil on the other hand is considered to be a dietary oil of high quality with a high concentration of unsaturated linoleic acid, vitamin
E and phytosterols [3,4]. In this study, an attempt was made to
prepare oil-in-water cosmetic emulsions by adding white or red
wine in the aqueous phase and using grape seed oil as the oil phase
in order to examine their stability with time and exploit their beneficial constituents. The study was complemented by using the
natural resin from the mastic tree of Pistacia lentiscus var. Chia as
additive to examine its impact on the organoleptic and rheological
characteristics of the emulsions. The mastic resin was chosen as amonitored surface tension decreased with time while the plate
remained into position. The analysis ceased when the surface
tension value was stabilized. Prior to each analysis, the surface
tension of deionised water was measured as control.
(b) Interfacial tension measurements of the two-phase system
using a K6 tensiometer (Krüss, Germany) at 25 ◦C. The Du Nouy
ring method was employed. A platinum ring was used first to
zero the indicator with grapeseed oil and then to measure the
interfacial tension between grapeseed oil and each aqueous
phase. Deionised water was used first as the aqueous phase for
the reference measurement. Then followed the other aqueous
phases which contained wine, measured from the most diluted
one (5%, v/v wine) to the least diluted (100%, v/v wine). The
interfacial tension of each system was measured at the point
where the ring broke away from the interfacial layer of the two
phases.
natural additive of Hellenic origin with healing and antibacterial
properties [5–9].