Catalysts that mimic enzymes could revolutionise pharma manufacturing
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Organic catalysts are
essential for a number of industrial applications, but their inability to
work within the same system or in water means their efficiency is somewhat
limited. Researchers from the Eindhoven University of Technology believe they
may have solved this problem by taking a leaf out of the structure of
nature’s own catalysts – enzymes. This could help to make industrial
processes such as drug manufacturing both faster and cheaper.
Enzymes are highly selective
and effective. Their three-dimensional structures mean their active sites are
very specific for their particular substrates. A crucial characteristic is
their outsides are hydrophilic, allowing them to work in the watery
environment of the body, while the insides – where the active site is
situated – are hydrophobic.
Catalysts used in organic
chemistry, on the other hand, are quite different. They typically do not have
large three-dimensional structures, and tend to be much less selective.
However, often they can stimulate reactions that enzymes cannot.
Best of both
worlds
Is there a way to get the
best of both worlds? Dr. Anja Palmans of the Eindhoven University of
Technology thinks so. “We can mimic the three-dimensional structure of an
enzyme using polymer chains,” she explains. “Using what is known as a
supramolecular re-cognition unit, we can fold these chains into
compartmentalised architectures much similar to enzymes, which we can then
insert a catalytic core into. The folded polymer chain will have a
hydrophilic outer surface similar to an enzyme, allowing the catalyst to work
in water.”
The possibilities opened up
by this research are numerous. Enzyme-like activity in a completely synthetic
system could be used for reaction cascades in which multiple reactions are
occurring at once in the same environment. “When making drugs, for example,
the current process involves carrying out one reaction, isolating the product
and then purifying the product before moving on to the next reaction and
repeating the whole process,” explains Palmans. “This is because standard
organic catalysts tend to inhibit or alter each other’s activity and so
cannot be used within the same system.”
“However, with these synthetic
catalysts the active site is shielded and so they do not interfere with each
other. This allows one to have a system in which a number of reactions can be
happening simultaneously within a single procedure.”
The first experiments on
cascade catalytic systems are now running, but the next step will be to
relate the structure of the polymers back to the catalytic activity. It will
be another few years before the final results of this intriguing research are
published, and it could be that it helps to revolutionise the use of organic
catalysts.
CHWKLY140715
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Friday, July 18, 2014
TECH / PHARMA SPECIAL...................... Catalysts that mimic enzymes could revolutionise pharma manufacturing
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