This report, prepared by the Materials Research and Characterization Unit (UICMA) at the University of Chile, presents a comparative morphological analysis of three sequential forms of grape pomace: M1 (grape skin and seed), M2 (vitreous biomaterial—produced through Powder House’s Vitreous Transformation Process applied to grape pomace from Biograpes SpA), and M3 (ultrafine powder derived from the vitreous biomaterial). Using field emission scanning electron microscopy (FE-SEM), progressive surface transformations were observed. M1 exhibited a smooth surface with spheroidal structures; M2 showed a rougher, more compact surface; and M3 consisted of amorphous, aggregated particles with surface roughness inherited from the vitreous biomaterial. Particle size distribution analysis of M3, based on 273 measurements, revealed a peak at 10 ± 0.4 μm, with 91% of particles under 30 μm—confirming the successful production of ultrafine powder. This progressive structural evolution demonstrates that the transformation process developed by Biograpes SpA—including the intermediate vitrification stage—not only deconstructs the vegetal matrix but also reconfigures its internal architecture to enhance particle size reduction and improve functional dispersibility.
