Abstract: The present invention relates to a method for synthesising nanoparticles consisting of or comprising at least one zeolite nanocrystal according to which a first composition/solution 1 containing an aluminium source and a source of an ion of an alkali metal M, in particular Na, is prepared and a second composition/solution 2 comprising a silicon source and a source of an ion of an alkali metal M, in particular Na, is prepared. The solutions 1 and 2 being free of any organic structuring agent. The two compositions/solutions 1 and 2 are mixed, and the mixture is crystallised, The nanoparticles thus formed are optionally separated. According to the invention, said first composition/solution 1 and the second composition/solution 2 both consist of the source and of an alkaline phosphate buffer (PBS). The present invention also relates to the nanoparticles obtained and compositions containing them.

Abstract: The present invention relates to a method for the preparation of a colloidal aqueous suspension of stable zeolite nanocrystals having framework structures comprising at least one cation selected from Gd, Fe, Cu and Ce, said structures being loaded with a gas selected from O2, CO2 and mixtures thereof, to the colloidal aqueous suspension of zeolite nanocrystals obtained by such a process, and to the use of said suspension in therapy, more particularly in cancer therapy and hypoxia-related diseases and/or in diagnosis.

Abstract: The present invention relates to a method for the preparation of a colloidal aqueous suspension of stable zeolite nanocrystals having framework structures comprising at least one cation selected from Gd, Fe, Cu and Ce, said structures being loaded with a gas selected from O2, CO2 and mixtures thereof, to the colloidal aqueous suspension of zeolite nanocrystals obtained by such a process, and to the use of said suspension in therapy, more particularly in cancer therapy and hypoxia-related diseases and/or in diagnosis.