Abstract
A fibre optic nephelometer was evaluated for use in measuring yeast cell numbers during the aerobic growth of yeast in grape juice. The response of the nephelometer to yeast cells in suspension decreased with increasing sugar concentration, and the decrease was dependent on the yeast population. Yeast cell number could be corrected from the observed nephelometer response with a calibration factor dependent on sugar concentration. Yeast populations as determined from the nephelometer response were compared to those determined by haemocytometer and optical density.
