Internship Report

CHARACTERIZATION AND COMPARISON OF THE FREEZE-DRYING PROCESS AT PT. HIJAUKAN BUMI LESTARI AND i3L

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"Freeze-drying, also known as lyophilization, is a drying method that is superior to other
drying methods in that it retains aroma, flavor, aroma, and nutrition better while also extending the
overall shelf-life of fruits and vegetables. Freeze-drying follows 3 stages/phases, freezing, primary
drying, and secondary drying. Different machines have different freeze-drying settings where PT.
Hijaukan Bumi Lestari utilizes a temperature-sensitive probe and i3L follows coordinated time stages
to move the freeze-drying process of strawberry and dragonfruit. The study's goals were to compare
the efficiency of both machines using data recorded on the machines themselves. The freeze-drying
results based on temperature vs. time were also characterized in order to identify the three main
freeze-drying steps. The final objective was to see if there is a significant difference in freeze-drying
strawberry and dragonfruit based on the shelf and product temperature differences
(ΔT)
of both
machines. According to the results, PT. Hijaukan Bumi Lestari's freeze-drying process took a shorter
time than the i3L’s machine. To measure the efficiency of each machine, the temperature difference
(ΔT)
between the product and shelf was calculated where PT. Hijaukan Bumi Lestari has higher
temperature discrepancies compared to i3L’s machine which means that it requires more
considerable energy to undergo the freeze-drying process. Furthermore, the Mann-Whitney U test
was used to compare the differences between freeze-drying strawberry and dragonfruit based on the
ΔT where strawberry and dragonfruit were not significantly different when dried at PT. Hijaukan
Bumi Lestari's machine, but they were significantly different when dried at i3L's machine."

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Availability

Detail Information

Series Title

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Call Number

EP FT001

Publisher

i3L, Jakarta : i3L, Jakarta., 2023

Collation

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Language

English

ISBN/ISSN

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Classification

NONE

Content Type

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Media Type

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Carrier Type

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Edition

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Subject(s)

Efficiency optimization
freeze-drying
significant differences
machine

Specific Detail Info

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Statement of Responsibility

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Other version/related

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