In this study, caustic treated waste cider yeast (S. cerevisiae) has
been successfully used as a biosorbing agent for removal of PAT
from apple juice. The Langmuir adsorption model and Freundlich
equation were used for the mathematical description of the biosorption
of PAT onto caustic treated yeast biomass. It was seen that
the adsorption equilibrium data conformed well by the Langmuir
model. Ca-alginate gels with and without biosorbent particles were
used as an immobilization matrix and it was found that Ca-alginate
gel was a good biosorbent for PAT biosorption. Immobilizing caustic
treated yeast biomass in Ca-alginate increased biosorption capacity.
It seems that the use of readily available waste cider yeast biomass
from fermentation industries offers an alternative for the removal
of PAT from apple juice.