Obstines

Obstines are a family of synthetic organic compounds developed for use as non-fouling surface coatings. The term was introduced by researchers at the Linnaeus Institute in 2015 to describe molecules that resist adsorption of proteins and microbes on contact with solids.

Chemical features: Obstines are amphiphilic, containing a hydrophobic alkyl tail linked to a polar functional head. They exist in several subtypes (obstines A, B, and C) with varying chain length and head-group chemistry, enabling tuning of surface affinity and thickness of the resulting film.

Synthesis: Obstines are typically prepared by a two-step sequence beginning with condensation of an amine with an aldehyde to form an imine, followed by reductive alkylation or hydrosilylation to install the hydrocarbon tail.

Properties: They readily form uniform self-assembled monolayers on oxide and some polymer surfaces, reduce protein adsorption, and show excellent chemical stability under physiological conditions. They are designed to be biocompatible but may require end-capping to prevent residual reactive groups.

Applications and research: In medicine, obstine coatings are investigated for catheters, orthopedic implants, and stents to reduce biofilm formation. In marine engineering, they are studied as antifouling coatings. Limitations include the need for controlled application methods and long-term biocompatibility data.

Regulatory and status: As with many advanced coatings, obstines are primarily in the research or early commercialization stages, with field trials and regulatory review ongoing.