For total carbohydrates a quite similar pattern can be observed.
Again, for the lower temperature curves (60 C and 100 C), no
influence of te can be observed, since carbohydrate concentration
(wGLU) remains constant after 5 min of extraction. Oppositely a
higher yield of total carbohydrates can be observed at TeP100 C,
which indicates a higher carbohydrate solubility at higher temperatures.
At 130 C wGLU starts to decrease with te and the decrease is
the highest at 160 C. This decrease of wGLU not only indicates a
decrease of carbohydrates in the sample but also a decrease of
present furfurals. Furfurals are namely the main constituents
formed in the phenol/sulfuric acid colorimetric method applied
for determination of total carbohydrates. Therefore it can be presumed
that products other than furfurals have formed during
extraction.