Thesis

Influence of Osmotic Dehydration Pretreatment on the Physicochemical Characteristics of Freeze-Dried Strawberries

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Strawberries are known for their vibrant color, juicy texture, and enticing sweetness, which may change
as they ripen. A freeze-drying (FD) process was used to alter the changes. However, because FD is a
time-consuming process, a pretreatment process is essential for accelerating the FD process. This
research aims to improve the FD process for strawberries by using osmotic dehydration (OD) as a
pretreatment strategy. Before freeze-drying, strawberries are immersed in a 63% sucrose solution for
varying lengths of time (1, 2, and 3 hours). The study compares the effect of OD pretreatment on the
physicochemical properties of FD strawberries, including MC, color, and sensory attributes, to a control
group. The results show that all FD strawberry samples had MC levels lower than the dried fruit's SNI
standard. The FD strawberries, on the other hand, did not meet the criteria outlined in a scientific article.
Color analysis revealed that OD pretreatment increased redness (a* value) while decreasing lightness (L*
value). According to sensory analysis, OD treatment improves color, taste, texture, and overall liking
while also increasing sweetness. However, no significant differences in MC were found between
treatments. These findings highlight the potential efficacy of OD as a valuable pretreatment technique
for optimizing the FD process for strawberries, thereby improving their color and sensory properties.
Further research should concentrate on refining the parameters of osmotic dehydration and improving
the process's energy efficiency and sustainability.

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Availability

Detail Information

Series Title

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Call Number

FT 23-013

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)

sensory analysis
freeze-drying
Osmotic Dehydration
Moisture Analysis (Oven Gravimetric Method)
Statistical Analysis

Specific Detail Info

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Statement of Responsibility

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