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In this study, microparticles of vegetable ivory, a porous and hygroscopic material obtained from Amazonian palm seeds, were treated by an air plasma jet while immersed in silicone oil. As a result, coatings were formed on their surface and a reduction in water vapor sorption was obtained. The reduction in water sorption was enhanced by mixing silicone oil with copaiba oil?resin, which acted as an interfacial agent between silicone oil and the particles during the in?liquid plasma treatment.Aiming to enhance the potential applications of bioproducts, we developed an innovative approach for their hydrophobization using plasma activation of liquids. In this study, microparticles of vegetable ivory, a porous hygroscopic material, were treated by an air plasma jet while immersed in silicone oil. The in?liquid plasma treatment formed coatings that reduced particle water vapor sorption. Pore surface coverage and sorption reduction were enhanced by mixing silicone oil with copaiba oil?resin (Copaifera spp.). Mulateiro extract (Calycophyllum spruceanum) was not as effective, owing to a lower affinity with silicone oil. For the first time, we demonstrate the plasma?induced coating formation on particles immersed in liquid mixtures, a process in which liquid–liquid interfacial properties play a fundamental role.