Perspectives, Tendencies, and Guidelines in Affinity-Based Strategies for the Recovery and Purification of PEGylated Proteins

Abstract

In recent years, the effective purification of PEGylated therapeutic proteins from reaction media has received particular attention. Although several techniques have been used, affinity-based strategies have been scarcely explored despite the fact that, after PEGylation, marked changes in the molecular affinity parameters of the modified molecules are observed. With this in mind, future contributions in the bioseparation of these polymer-protein conjugates are expected to exploit affinity in chromatographic and nonchromatographic techniques which will surely derive in the integration of different operations. However, this will only occur as novel ligands which are simultaneously found. As it will be mentioned, these novel ligands may be screened or designed. In both cases, computer-aided tools will support their identification or development. Additionally, ligand discovery by high-throughput screening (HTS) is believed to become a fast, economic, and informative technology that will aid in the mass production of ligands along with genetic engineering and related technologies. Therefore, besides analyzing the state of the art in affinity separation strategies for PEGylated molecules, this review proposes a basic guideline for the selection of adequate ligands to provide information and prospective on the future of affinity operations in solving this particular bioengineering problem.

Advances in Material Modification with Smart Functional Polymers for Combating Biofilms in Biomedical Applications

“…Table 3 shows other research works regarding smart, functional polymers for the control/prevention of biofilm formation in biomedical materials. Polyethylene glycol (PEG) derivates and temperature-sensitive Poly-N-isopropyl acrylamide (PNIPAAm) have been employed as reactive for the bioseparations or purification processes such as membrane operations, affinity precipitation, aqueous two-phase systems, and thermosensitive chromatography [46,49,53]. The detection and quantification of biological analytes or biosensing also exploit the properties or stimuli response polymers, for example, poly-(N-isopropyl acrylamide)-co-methacrylic acid (pNIPAm-co-MAAc) combined with surface plasmon resonance (SPR) let to recognize antibodies, pNIPAm with Au nanoparticles indicate elevate temperatures, poly(N-(3-amidino)-aniline) (PAAN) covering Au nanoparticles sensed CO 2 concentrations and pNIPAm-co-acrylic acid served as lowtemperature indicator of water [54].…”