Abstract: The invention relates to a method for isolating a biomolecule. A liquid sample comprising the biomolecule is contacted with an electrically conductive surface. The surface carries a chemical modification facilitating retention of said biomolecule, or an electrical retention potential is applied to said surface. The biomolecule is released by applying a voltage to the surface. The invention further relates to a device comprising a chamber configured for receiving a liquid sample, wherein a first surface of said chamber is a working electrode formed by a high-surface, electrochemically active material embedded in a non-electrically conductive polymer matrix. The device further comprises a counter electrode and connections to a voltage source. The invention further relates to a device and method for loading an extracellular vesicle with cargo molecules.

Abstract: Polymers useful for associating therewith oligonucleotides and for delivering the oligonucleotides into a cell, conjugates comprising these polymers and an oligonucleotide associated therewith, and compositions comprising same are provided. Also provided are uses of these conjugates in, for example, gene therapy, and particularly gene silencing. The disclosed polymers feature a PGA backbone, and amine-terminated pendant groups attached to at least 40% of the backbone units, and optionally further comprise alkyl pendant groups and/or other nitrogen-containing pendant groups attached to other one or more portions of the backbone units. The disclosed polymers can be cross-linked or can form a part of a block-copolymer.