Corinna Dawid, left, says that knowing the cause of the bitter off-taste of rapeseed has opened the doors for process and breeding strategies.
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accompanying substances
contained in rapeseed strongly
impair the taste of the obtained
protein isolates. These substances
include, for example, very
bitter-tasting secondary plant
constituents. Hofmann and his
team therefore looked into the
issue of which bitter substances
cause the rapeseed protein’s
unpleasant bad taste.
The key substance
that makes rapeseed
protein taste bitter
The researchers investigated three
different protein isolates using mass
spectrometric analysis methods and
taste tests. The first isolate was an
extract of all the proteins contained
in rapeseed meal. The second
isolate predominantly contained
cruciferin and the third napin,
which are the rapeseed’s two main
storage proteins. All three isolates
had a protein content of 80 to 90
percent.
As the investigations show for
the first time, a compound called
kaempferol 3-O-(2‘‘‘-O-sinapoyl-ßsophoroside)
is the key substance
that makes protein extracts from
rapeseed inedible. The cruciferin
isolate in particular contained
a large amount of this bitter
substance with 390 milligrams per
kilogramme. The rapeseed meal
and napin isolate had less than a
tenth of the quantity, but still tasted
bitter in the sensory test.
Starting point for
new processes
“Since we now know the cause of
the bitter off-taste, it is much easier
to develop suitable technological
processes or breeding strategies
that can be used to produce tasty,
protein-rich foods from rapeseed,”
says co-author Corinna Dawid,
who heads the Phytometabolomics
research group at TUM.
Rapeseed may provide a
future protein source.
www.foodtechnology.co.nz 23
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