Green Chemistry · Biocatalysis
An enzyme is a protein, and a protein that gets too hot unravels like a ball of yarn. That has kept enzymes out of hot chemistry for decades.
A German team just put one inside a porous cage and ran it at 100 degrees, twice as fast, twelve times over.
Researchers at Bielefeld University, led by Harald Gröger and Andreas Hütten, encapsulated a lipase enzyme in a porous organic polymer cage so it stays active at 100 degrees Celsius and above. The encapsulated enzyme worked about twice as fast at 100°C as at room temperature, and its performance stayed virtually unchanged over twelve reaction cycles, while the unprotected lipase largely lost its activity. The method allowed reactions at 110°C and, in further experiments, up to 120°C, using starting materials in molten form without organic solvents, with esters for cosmetics, fragrances, and plastics as a potential use. Published in Angewandte Chemie and honored with the Jörg Schwarzbich Inventor Award, it remains a laboratory result: long-term stability and industrial scale-up still need to be shown.
A porous polymer cage keeps the enzyme folded while letting reactants in and products out.
Giving Enzymes a Heat Shield
Researchers at Bielefeld University have found a way to use enzymes at 100 degrees Celsius and above, temperatures that normally destroy them.
Their approach is to encapsulate the enzyme in a protective porous structure. It keeps the enzyme working and lets it be reused multiple times.
The results are published in the journal Angewandte Chemie. The source text prints the journal name with an extra word attached, so this article uses the shorter name only.
The point is practical. Enzymes can make chemicals more sustainably, but some substances can only be processed hot, and enzymes usually cannot take the heat.
The work removes that restriction for at least one enzyme, in laboratory experiments, and the researchers are already talking with companies.
Why Industry Wants Enzymes — and Why Heat Defeats Them
Enzymes are the biocatalysts of living organisms. They enable and speed up chemical reactions and keep them under control.
That is attractive for the chemical industry. Compared with many conventional processes, enzyme-catalyzed reactions can often be run under milder conditions, which saves energy, uses raw materials more efficiently, and helps prevent waste.
The source compares it to a ball of yarn being pulled apart. The enzyme unfolds, and once it does, it loses its activity as a catalyst.
That is why high-temperature chemistry has stayed largely out of reach for enzymes, even when the products would be valuable.
The Cage Idea: Embedding Instead of Attaching
Professor Harald Gröger, from the Department of Chemistry, and Professor Andreas Hütten, from the Department of Physics, led the work with their teams.
Their idea was to embed the enzyme in a protective three-dimensional environment so it keeps its shape, and therefore its activity, even when hot.
They encapsulated the enzyme in a porous structure made of an organic polymer. The pores are large enough for the substances the enzyme needs to get in and for the products to get out.
Gröger sums up the decisive step: not attaching the enzyme to surfaces, but incorporating it into a three-dimensional cage.
Lipase at 100°C: Twice as Fast, Twelve Cycles
The team used a lipase, an enzyme often used in chemical synthesis but normally sensitive to heat.
| Test | Reported result |
|---|---|
| Encapsulated lipase at 100°C | Remained active |
| Speed at 100°C versus room temperature | About twice as fast |
| Reuse at 100°C | Performance virtually unchanged over twelve reaction cycles |
| Same lipase without protection | Largely loses its activity |
The comparison with the unprotected enzyme is what confirms the cage is doing the protecting.
Dr. Jianing Yang, the first author, says the research began with a basic question: which methods could stop enzymes from denaturing at high temperatures and under challenging reaction conditions. Building them into tailored cage compounds gave the desired properties.
Twelve cycles is a laboratory reusability test, not a long production run, and the source says long-term stability still needs study.
Solvent-Free Chemistry With Molten Ingredients
The benefit goes beyond the enzyme. Some starting materials are solid at room temperature and do not melt until 100 degrees Celsius or higher.
For enzymatic reactions, such substances often had to be mixed with a solvent first, which made the process more complex.
With the new method, the researchers can use these substances directly in molten form. They carried out a reaction at 110 degrees Celsius, and further experiments showed the approach works at up to 120 degrees.
One potential application is the production of esters, which are used in cosmetics, fragrances, and plastic products. Many starting materials for these have melting points above 100 degrees Celsius.
The source describes this as a potential application. It does not report an ester process running at industrial scale.
Looking Inside a Messy Material
Professor Hütten and his team studied the material's structure and how the enzyme sits inside it, using electron microscopy among other techniques.
They examined the porous polymer with a high-resolution transmission electron microscope, which let them see into its interior.
Hütten says this was a particular challenge because the material is not structured as regularly as a crystal.
The investigations were crucial for understanding how the porous structure is organized and how the enzyme is encapsulated.
The source does not give pore sizes, the polymer's identity, or how much enzyme is loaded, so those details are not claimed here.
From Award to Industry: What Is Still Unproven
The researchers have since held discussions with companies from various product sectors. The goal is to develop the process further and extend it to other enzymes and industrial processes.
The research received the Jörg Schwarzbich Inventor Award 2025 in early 2026. The prize, worth 40,000 euros, is given by the Bielefeld University Society and Bielefeld University for scientific inventions with high innovation and application potential.
An award recognizes potential, not a finished process. The source reports a single enzyme, a lipase, and laboratory experiments.
Gröger's stated next step is to develop the concept further and make it suitable for industrial applications.
Manohar Insight
The idea I like most is how little it changes about the enzyme itself. The team did not re-engineer the protein. They changed its surroundings, giving it a cage that keeps it from unraveling.
That framing is useful beyond this one case. If the shape of the home matters as much as the enzyme, then many sensitive biological catalysts might be protected the same way.
The numbers are encouraging but narrow. Twice as fast at 100°C and virtually unchanged over twelve cycles are good laboratory results for one lipase. They are not yet a production record.
The solvent-free angle may matter as much as the heat tolerance. Being able to use ingredients directly in molten form removes a step that made enzymatic routes more complicated.
The detail I would watch is long-term stability. Twelve cycles is a start, but an industrial process needs far more, and the researchers say so themselves.
The real story is not a hot enzyme. It is a protective cage that moves biocatalysis into temperatures and ingredients it could not use before, and the open question is whether it holds up at scale.
Join the Signal
If protecting a catalyst's surroundings works as well as redesigning the catalyst, which other fragile biological tools might deserve a cage? Share your take in the comments.
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