Report

The Effect of Ultra High Temperature (UHT) Processing towards pH and Total Soluble Solids Stability of Reconstituted Orange Juice, Jasmine Tea, and Vanilla Milk during Refrigerated, Ambient, and Incubated Storage.

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Ultra High Temperature treatment is a process of heating the product between 135 and 145
C for
around 1-10 seconds which resulted in an effectively sterile product with a shelf life that lasted
months at ambient temperature. The UHT system used in PT XYZ is an indirect small-scale process
plant initially and mainly used for clients to conduct trials for their products and application to test
whether there are sensory changes after heat treatment. To fully utilize the machine and ensure its
capability in maintaining product safety, a stability test focusing on the pH, brix content, and sensory
changes in various temperatures is conducted. The experiment utilized three different types of
beverages which were reconstituted orange juice, jasmine tea, and vanilla milk in which these
beverages were stored in three different storage temperatures (4
o
C, 25
o
C, 40
o
C) for four weeks and
observations were made in each week. pH of orange juice remained stable, while the brix value
generally decreased overtime and at higher storage temperatures. Jasmine tea was observed to have
a decrease and fluctuation in the pH measurements and stable brix value. Whereas both pH and brix
of vanilla milk were observed to have an extreme fluctuation and instability as well as major physical
changes. All the samples showed a flavor impartment throughout the storage duration especially in
higher temperatures. These changes and instability were affected by the chemical changes induced
by heat treatment, microbial spoilage, and storage temperature that affect the properties of the
beverages

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Detail Information

Series Title

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Call Number

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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)

pH
sensory analysis
Brix
Ultra High Temperature
orange juice
jasmine tea
vanilla milk

Specific Detail Info

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Statement of Responsibility

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Other version/related

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