Turbidity of plasma after freeze-drying and rehydration.

Spectroscopic analysis of plasma turbidity (i.e. absorbance at 550 nm), both before and after freeze-drying of plasma without supplements (-) as well as supplemented with 2.5−10% glucose (GLU), sucrose (SUC) or trehalose (TRE). Plasma from six different donors was analyzed (L1−6), with performing three technical replicates each. Mean ± standard deviations are presented, while statistically significant (p<0.05) differences amongst the time point of analysis (i.e. pre versus post freeze-drying) are indicated with an asterisk, and those between different sugar concentrations used (post freeze-drying data only) are indicated with different superscript letters. Values between different donors were statistically significant for all cases.