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Harm-Anton Klok

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Related publications (193)

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Glucose Monitoring Using a Polymer Brush Modified Polypropylene Hollow Fiber-based Hydraulic Flow Sensor

Nicolas Fortin, Harm-Anton Klok

Tight regulation of blood glucose levels of diabetic patients requires durable and robust continuous glucose sensing schemes. This manuscript reports the fabrication of ultrathin, phenylboronic acid (PBA) functionalized polymer brushes that swell upon gluc ...

Amer Chemical Soc2015

Polymer Nanoparticle-Mediated Delivery of Oxidized Tumor Lysate-Based Cancer Vaccines

Harm-Anton Klok, Alice Boarino, Cristiana Berti

Cancer vaccination is a powerful strategy to combat cancer. A very attractive approach to prime the immune system against cancer cells involves the use of tumor lysate as antigen source. The immunogenicity of tumor lysate can be further enhanced by treatme ...

2021

Arginine-specific protein modification using alpha-oxo-aldehyde functional polymers prepared by atom transfer radical polymerization

Harm-Anton Klok, Frederik Roman Wurm, Maxime Ayer

The residue-specific modification of peptides and proteins is a powerful strategy for preparing biomolecular-synthetic polymer conjugates with advanced properties. This manuscript aims at expanding the present toolbox of residue-selective protein modificat ...

2011

Synthesis of Loop Poly(Methyl Methacrylate) Brushes via Chain-End Postpolymerization Modification

Harm-Anton Klok, Piotr Mocny

Polymer brushes are typically densely grafted assemblies of polymer chains that are tethered via one end group to a solid substrate. Anchoring linear polymer chains via both end groups to a surface results in loop-type polymer brushes. Although loop polyme ...

American Chemical Society2019

Peptide/protein – polymer conjugates: synthetic strategies and design concepts

Harm-Anton Klok

This feature article provides a compilation of tools available for preparing well-defined peptide/protein–polymer conjugates, which are defined as hybrid constructs combining (i) a defined number of peptide/protein segments with uniform chain lengths and d ...

Royal Society of Chemistry2008

The Structural Dispersity of Oligoethylene Glycol-Containing Polymer Brushes Determines Their Interfacial Properties

Harm-Anton Klok

Ought to their bioinert properties and facile synthesis, poly[(oligoethylene glycol)methacrylate]s (POEGMAs) have been raised as attractive alternatives to poly(ethylene glycols) (PEGs) in an array of (bio)material applications, especially when they are ap ...

Amer Chemical Soc2024

Poly(ethyleneimine)-Mediated Large-Scale Transient Gene Expression: Influence of Molecular Weight, Polydispersity and N-Propionyl Groups

Harm-Anton Klok, Florian Maria Wurm, David Hacker, Lucia Baldi Unser, Zuzana Kadlecova

Three synthesis lots of linear poly(ethyleneimine) (PEI) are compared to a fully hydrolyzed linear PEI (commercially available as PEI Max) regarding structure, polyplex formation with plasmid DNA, and transfection of suspension-adapted HEK-293E cells. PEI ...

Wiley-Blackwell2012

Thermotropic ionic liquid crystals via self-assembly of cationic hyperbranched polypeptides and anionic surfactants

Harm-Anton Klok, Markus Scholl

This work describes the dilute solution and solid-state structure of polyelectrolyte complexes generated from hyperbranched polylysine (HBPL) and various anionic, sodium alkyl sulfate surfactants. In dilute solution, the radius of gyration (Rg) of the HBPL ...

American Chemical Society2007

Squaric Acid Mediated Synthesis and Biological Activity of a Library of Linear and Hyperbranched Poly(Glycerol)-Protein Conjugates

Harm-Anton Klok, Frederik Roman Wurm

Polymer-protein conjugates generated from side chain functional synthetic polymers are attractive because they can be easily further modified with, for example, labeling groups or targeting ligands. The residue specific modification of proteins with side c ...

American Chemical Society2012

Complex coacervate core micelles with a lysozyme-modified corona

Harm-Anton Klok, Maarten Danial

This paper describes the preparation, characterization, and enzymatic activity of complex coacervate core micelles (C3Ms) composed of poly (acrylic acid) (PAA) and poly (N- methyl-2- vinyl pyridinium iodide)-b-poly (ethylene oxide) (PQ2VP-PEO) to which the ...

2007

Swelling Behavior and Nanomechanical Properties of (Peptide-Modified) Poly(2-hydroxyethyl methacrylate) and Poly(poly(ethylene glycol) methacrylate) Brushes

Harm-Anton Klok, Kislon Voitchovsky, Solenne Desseaux, Nicolas Bertrand Schüwer

Poly(2-hydroxyethyl methacrylate) (PHEMA) and poly(poly(ethylene glycol) methacrylate) (PPEGMA) brushes represent a class of thin, surface-tethered polymer films that have been extensively used e.g. to generate non-biofouling surfaces or as model systems t ...

American Chemical Society2016

Size- and Coating-Dependent Uptake of Polymer-Coated Gold Nanoparticles in Primary Human Dermal Microvascular Endothelial Cells

Harm-Anton Klok

A library-orientated approach is used to gain understanding of the interactions of well-defined nanoparticles with primary human endothelial cells, which are a key component of the vasculature. Fifteen sequentially modified gold nanoparticles (AuNPs) based ...

American Chemical Society2012

Opportunities and Challenges for Lignin Valorization in Food Packaging, Antimicrobial, and Agricultural Applications

Harm-Anton Klok, Alice Boarino

The exploration of renewable resources is essential to help transition toward a more sustainable materials economy. The valorization of lignin can be a key component of this transition. Lignin is an aromatic polymer that constitutes approximately one-third ...

American Chemical Society2023

RGD-Functionalized polymer brushes as substrates for the integrin specific adhesion of human umbilical vein endothelial cells

Nikolaos Stergiopoulos, Harm-Anton Klok, Stefano Tugulu, Paolo Silacci

This report demonstrates the feasibility of surface-initiated atom transfer radical polymerization to prepare thin polymer layers ("brushes") that can be functionalized with short peptide ligands and which may be of use as coatings to promote endothelializ ...

2007

A Post-Modification Strategy for the Synthesis of Uniform, Hydrophilic/Hydrophobic Patterned α-Hydroxy Acid Oligomers

Harm-Anton Klok, Laure Menin, Nadja Franz

Hydrophilic/hydrophobic patterning is a well-established design strategy to guide secondary structure formation of both natural as well as non-natural oligomers and polymers. This contribution explores the feasibility of a new approach for the synthesis of ...

2009

Chemically Recyclable, Hydroxycinnamic Acid‐Derived Semi‐Aromatic Polycarbonates

Harm-Anton Klok, Pascal Alexander Schouwink, Ghezae Tekleab

Polycarbonate polymers find widespread use for a variety of applications. Driven by the need to transition away from fossil‐based resources, there is increasing interest in exploring bio‐based monomers for the synthesis of polycarbonates. One interesting c ...

Wiley2025

Synthesis of Functional Polydepsipeptides via Direct Ring-Opening Polymerization and Post-Polymerization Modification

Harm-Anton Klok, Nadja Franz

This contribution explores different strategies for the synthesis of side chain functional polydepsipeptides. First, the ring-opening polymerization of side chain functional morpholine-2,5-diones is revisited and the optimized reaction conditions used for ...

2010

PEG-based hybrid block copolymers containing α-helical coiled coil peptide sequences: Control of self-assembly and preliminary biological evaluation

Harm-Anton Klok

This study investigates the structure and organization of a series of hybrid diblock copolymers based on polyethylene glycol) (PEG) and peptide sequences inspired by the coiled coil protein folding motif. Circular dichroism spectroscopy and analytical ultr ...

American Chemical Society2005

Cell Uptake and Trafficking Behavior of Non-covalent, Coiled-coil Based Polymer-Drug Conjugates

Harm-Anton Klok, Bojana Portmann

This paper reports on the cell uptake and trafficking properties of a series of non-covalent polymer-drug conjugates. These nanomedicines are composed of a poly(N-(2-hydroxypropyl)methacrylamide) backbone functionalized with multiple copies of a drug. The ...

Wiley-Blackwell2011

Degradable Polymer Brushes Prepared via Surface-Initiated Controlled Radical Polymerization

Harm-Anton Klok, Nicolas Bertrand Schüwer

Hydrolytically degradable polymer brushes would represent an interesting platform for the development of functional coatings for various biomaterials applications In this manuscript, the surface- initiated atom transfer radical copolymerization of 5.6-benz ...

American Chemical Society2009