The yeast inoculum was prepared as described by Scholar and
Benedikte (1999) and Suh et al. (2007). One gram of dry baker’s
yeast purchased from Kumasi central market was grown on Yeast
Peptone Dextrose (YPD) agar plate at 30
oC for 48 h to activate the
yeast and check for contaminates. A loopful of the yeast colony was
transferred from the agar plate into 100 ml of 5% YPD broth and
incubated at room temperature on a shaker at 130 rpm for 48 h.
Seven milliliters of the broth (from calculation) was centrifuged at
4500 rpm for 5 min. The supernatant was decanted, and the pellet
was resuspended in 10 ml of sterile distilled water twice, centrifuged
and the supernatant decanted. The pellet was resuspended in
1/10
th
of 50 mM citrate buffer of working for each flask and was
used as its inoculum.