Studies on The Development of Baker’s Yeast Using Cane Molasses
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Date
2008-01
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Addis Ababa University
Abstract
Three yeast strains were used for biomass production of baker’s yeast using wine,
brewer and baker’s yeast strains. The effect of growing yeast saccharomayces cerevisiae
on cane molasses with respect to baker’s yeast production was assayed. All yeast strains
were cultured in YPD microbiological media and cane molasses media; their growth
properties and biomass yield were examined using different substrate concentration of
cane molasses and different nitrogen source chemical compounds. The studies on the
feasibility of different types of yeast growth on cane molasses has been analyzed here. As
a result of the kinetics study of growth of three yeast strains shows that baker’s yeast
strain gives the best results to know a generation time reduced high growth rate and a
high quantity of biomass. The maximum biomass yield and protein concentration was
obtained with the 5 %(w/v) cane molasses of bakers` yeast; the effect of different
concentration of cane molasses (5%, 10% and 15% sugar concentration) on biomass yield
and protein concentration of bakers, wine and brewery yeast strains were studied.
Biomass and protein formation was affected by the type of nitrogen present in the
medium; high yield of protein being achieved in fermentation medium containing 2 %
(w/v) (NH4)2SO4. Conversely medium, containing potassium nitrate had suppressive
effect of protein production. Baker’s yeast production was industrialized using baker’s
yeast strain in 5%(w/v) cane molasses with addition of ammonium sulphate.The results
obtained on industrial scale feasibility study shows that the unit costs for the baker’s
yeast production are $2.4 per kilogram, while the local market price for the baker’s yeast
is $7.00/kg. It has good market demand and profitability analysis also provides positive
results.
Keywords: Baker’s yeast (saccharomayces cerevisiae), Biomass, molasses and
Single protein.
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Keywords
Baker’s Yeast (Saccharomayces Cerevisiae), Biomass, Molasses and Single Protein