Embodiments of the present disclosure are directed to methods, systems and devices, for analyzing the molecules. For example, in some embodiments, a system is provided which includes a first volume of conducting fluid, a second volume of conducting fluid, an orifice in communication with the first and second volumes of fluid, and means for applying an electric potential difference between the first and second volumes of fluid. In some such embodiments, a conjugate product is provided which includes charged polymers each having attached thereto at least one first molecule for analysis, where the product carries a predetermined charge greater than the charge on the first molecule, and upon dissolving the product in the first volume of fluid, the product is directed into the orifice.