We obtained 72 yeast strains able to ferment xylose
from the approximate 100 natural samples collected.
The ethanol production ability of each isolated strain
was determined using a rich medium with YPX medium
containing 4% xylose. Among the isolated strains, 16
Sample processing, yeast cultivation and isolation
Five grams of each soil sample was suspended in 5 ml
of sterile water by vigorous agitation on a vortex for
10 min. Following decantation of the coarse particulate
material, 200 μl of the suspension was seeded onto
plates containing YM medium (0.3% yeast extract,
0.3% malt extract, 0.5% peptone) supplemented with
2% glucose and 100 μg/ml chloramphenicol (YM-cm).
The plates were incubated at 4, 10, 15 and 22°C. Duplicate
of water sampling dishes were incubated at 4
and 10°C. The plates were incubated for 3 months and
periodically inspected for colony development. Once a
colony became visible, it was immediately transferred
to fresh YM-cm plates and incubated at the same
temperature as the source-plate. The procedure was
repeated for each soil sample to maximize the number
of isolates
We obtained 72 yeast strains able to ferment xylose
from the approximate 100 natural samples collected.
The ethanol production ability of each isolated strain
was determined using a rich medium with YPX medium
containing 4% xylose. Among the isolated strains, 16
Sample processing, yeast cultivation and isolation
Five grams of each soil sample was suspended in 5 ml
of sterile water by vigorous agitation on a vortex for
10 min. Following decantation of the coarse particulate
material, 200 μl of the suspension was seeded onto
plates containing YM medium (0.3% yeast extract,
0.3% malt extract, 0.5% peptone) supplemented with
2% glucose and 100 μg/ml chloramphenicol (YM-cm).
The plates were incubated at 4, 10, 15 and 22°C. Duplicate
of water sampling dishes were incubated at 4
and 10°C. The plates were incubated for 3 months and
periodically inspected for colony development. Once a
colony became visible, it was immediately transferred
to fresh YM-cm plates and incubated at the same
temperature as the source-plate. The procedure was
repeated for each soil sample to maximize the number
of isolates
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