Freezing and frozen storage of fresh Barhi fruits exhibited
clear effects on basic color values (L*, a* and b*) and their
derivative parameters. Freezing and freezing methods greatly
influenced the textural properties of the fruits. In general, textural
parameters decreased with storage time and were dependent
on freezing method. Analysis of basic sugars (fructose,
glucose, and sucrose) in the fruits showed a sharp increase in
fructose and glucose and a decrease in sucrose for fruits until
the end of the frozen storage period. The increase of enzymatic
activities of poly phenol oxidase and peroxidase led to a more
deterioration of fruit quality with storage time especially with
conventional slow freezing method. Temperature distribution
curves showed a high variation of freezing times of the three
examined systems. There was a large difference between the
times of freezing of the three methods in favor of cryogenic
freezing.