It is shown that by adding white wine to reach 50% (v/v) in the aqueous phase, the interfacial tension between this phase and grapeseed oil decreases to half the value of the reference interfacial tension between grapeseed oil and water, i.e. from 20.9 mN/m to 10.4 mN/m. Even though the interfacial tension of the two-phase system is much lower for high concentrations of white wine than for the corresponding ones of red wine, it is noteworthy that emulsions were successfully prepared only with red wine at such high percentages. This means that although these two-phase systems of grapeseed oil and 50% or 100% (v/v) white wine appear to be physicochemically favoured, their interaction with the emulsifier GMS could result in unfavourable synergy for the preparation of stable emulsions. Further investigation of which wine components (polyphenols, polysaccharides, organic acids etc.) interact with GMS could elucidate the cause of this effect and will be planned for a future study.