MOF integrity was evaluated after carvacrol infiltration by means of XRPD analysis performed before and after the encapsulation process (Figure ), confirming that MIL-100(Fe) crystal structure is maintained after carvacrol loading. Then, to identify the porous nature of the composite material and therefore determine the external or internal association of the carvacrol molecules, N2 sorption studies were conducted before and after carvacrol impregnation (Figure ). A significant decrease (ca. 87%) in the porous surface was evidenced after carvacrol encapsulation (SBET = 1491 vs. 196 m 2 •g -1 , respectively for MIL-100(Fe) and carvacrol@MIL-100(Fe)), which is consistent with an effective carvacrol loading. (f) Selected infrared spectra region (1800-400 cm -1 ) of the composite as compared with MIL-100(Fe) and free carvacrol (red).