The regulation of growth and the production of flavor
compounds by Kluyveromyces
marxianus were accomplished
according to the nutritional requirements (yeast
extract, ammonium sulphate and glucose concentrations) by using
Response Surface Methodology experiments. Results proved that increasing both initial yeast extract (YE)
and glucose concentrations in the fermentation medium favored both the growth
and production of fusel alcohols. The major fusel alcohol (isoamyl alcohol) and
the acetate ester compound (ethyl acetate) produced in all flasks were
determined in the concentration range 1299-3996 µg L-1 and 1558 to
3122 µg L-1,
respectively. In a scale-up attempt, productions were
accomplished in a 5 L stirred tank bioreactor. The highest productivity
values for major volatile flavor compounds, i.e., ethyl acetate (fruity), isoamyl alcohol (banana), 2-phenylethyl
acetate (floral) were obtained during the exponential growth of the yeast in a 5 L
stirred tank bioreactor. Additionally, the descriptive sensory terms “sourdough”, “flower” and “sweet
aromatic” were characteristics for volatile compounds produced by K. marxianus. This work also demonstrated
high product losses due to the stripping effect when the production scaled up
from flasks to bioreactor.
Sensory evaluation Kluyveromyces marxianus Natural flavor compounds Optimization Bioreactor Sensory evaluation
Primary Language | English |
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Subjects | Food Engineering |
Journal Section | Articles |
Authors | |
Publication Date | January 22, 2018 |
Submission Date | May 30, 2017 |
Published in Issue | Year 2018Volume: 4 Issue: 2 |
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