Therefore, it is important
to know the collapse temperature so that the
drying proceeds without any loss of product quality. In
the freeze drying experiments of sugar solutions at various
solids concentration, Tsourous¯is et al. (1976)
showed that the collapse temperatures can be raised by
the addition of high molecular weight materials. It
should be noted here that the increase in collapse temperature
is directly related to the increase in glass transition
temperature as stated earlier.