formate buffer and the base are added in the vial and the reaction mixture is heated for a short time the acid eluate is normally constituted by an aqueous solution of a strong acid as for example hcl while the base is an aqueous solution of a strong base as for example naoh on the whole the use of formate buffer guarantees a suitable ph even if variations in the eluate acidity occur and in this way reduces the amount of not complexed ga 68 due to a too low or a too high ph resulting in high content of free 68 ga 3 or 68 ga hydroxides respectively moreover the addition of a sequestering agent allows to bring down the amount of chelator functionalized molecule needed to obtain a complete ga 68 complexation these two aspects enabled the applicant to achieve a suitable degree of complexation advantageously at least 92 95 and 97 and consequently a sufficient purity at least 92 95 and 97 without any kind of pre or final purification since the results obtained confirm the feasibility of a direct ga 68 labeling that doesn 39 t require manipulation or purification the formulation can be applied to the production of a specific kit therefore according to a particular embodiment the invention relates also to a kit comprising a siliconized vial containing the chelator functionalized molecule and the selected sequestering agent a siliconized vial or a syringe containing a suitable ultra pure formic acid sodium formate mixture moreover the invention relates also to a single vial containing the.