A purely organic, crystalline matrix that can encapsulate, protect and preserve bio-molecules such as proteins, vaccines and enzymes.


Hydrogen-Bonded Organic Frameworks (HOFs) are a class of porous framework material made from organic components that are assembled into crystalline networks via intermolecular hydrogen bonding.

This invention specifically utilises a family of HOFs to encapsulate bio-molecules and to protect them from inhospitable conditions. The process is carried out in 'one-pot' by simply mixing the organic components and the bio-molecule. The HOF components spontaneously co-crystallise around the bio-molecule as observed in confocal laser scanning microscopy (CLSM) imaging.

Structural data shows the HOF and the bio-molecule-HOF structures are the same, indicating that the porous structure is retained. The crystalline HOF shell protects the encased biomolecule from unfavourable conditions including elevated
temperature, organic solvents and proteolytic agents that would normally lead to decomposition of the protein structure and loss of native activity.

This has been demonstrated for one model enzyme which is well understood by the team and additional work is underway to generalise the invention to other bio-molecules and other HOFs.


As this is a platform technology, multiple application areas are possible including the use of HOF technology as a system to enhance, protect or target bio-molecules to specific sites during drug delivery.

Further, the activity of vaccines may be preserved by the use of HOFs, particularly where the cold-chain cannot be maintained during logistics, transportation and storage. As these frameworks are metal-free, they have the potential to overcome the toxicity limitations of Metal Organic Frameworks (MOFs) for such uses, as well as other materials e.g. Zeolite imidazolate frames (ZIFs), of typically smaller pore sizes and currently being used extensively in gas storage applications.

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