Effect of Hot-Water Blanching Pretreatment on Drying Characteristics and Product Qualities for the Novel Integrated Freeze-Drying of Apple Slices

Table 1

Color difference of freeze-dried and rehydrated samples in 3 freeze-drying methods.

Fresh sample
Freeze-dried sample
VF-FD
HWB-VF-FD
HWB-PF-FD
Rehydrated sample
VF-FD
HWB-VF-FD
HWB-PF-FD

VF-FD: apple samples without hot-water pretreatment were performed with vacuum freezing treatment and freeze-drying process; HWB-VF-FD: apple samples with hot-water pretreatment were performed with vacuum freezing treatment and freeze-drying process; HWB-PF-FD: apple samples with hot-water pretreatment were performed with plate freezing treatment and freeze-drying process. Note. Different letters on the same columns indicate significant differences at by Tukey’s HSD test.