there existed little difference in this slight harshness between the various homogenized samples in later tests using lower oil juice samples less harshness was noted thereby indicating that this increased oil dispersion would not be a bar to commercial practicality the shelf life of non homogenized unpasteurized juice stored at 40 u00b0 f control was about 10 days the shelf life of unpasteurized juice homogenized at 9500 psi was 20 days the shelf life of the unpasteurized juice was extended to 40 days when a homogenization pressure of 15 000 psi was used shelf life was determined by tasting the shelf life was ended when a significant amount of fermented flavor was detected or when the quality rating score had dropped significantly compared to day zero additional related experiments were carried out in an attempt to better understand this process example 1 table 2 it was found that pectinesterase activity peu was relatively unaffected by homogenization in either of the homogenizers at the pressures investigated similar reductions in microbial counts were noted in these experiments with the cd homogenizer design being more effective table 2______________________________________example 1pectinesterase microbiological activity in orange juiceas a function of homogenization pressurecomparison of homogenizers experiment no 1 2.