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48172

EFFECT OF FROZEN STORAGE ON THE QUALITY ATTRIBUTES OF FRESH AND CONCENTRATE CUT-BACK STRAWBERRY JUICES

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Last updated: 04 Jan 2025

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Abstract

The present study was aimed to evaluate the effect of frozen storage at -18°C for 6 months on the quality attributes of the fresh and the concentrate Cut-back strawberry juices. The obtained results showed that the concentrate Cut-back strawberry juice was more acceptable by panelists. A significant decline in titratable acidity after freezing was observed in both types of strawberry juices; it decreased from 0.85 to 0.41 and from 0.98 to 0.49% for fresh strawberry juice and concentrate Cut-back juice, respectively. After 6 months of frozen storage similar tendency was observed for their vitamin C content having 9.45 and 29.23 mg/100ml for fresh and concentrate Cut-back strawberry juice, respectively. The pH increased from 3.805 to 4.340 and from 3.604 to 4.252 for fresh strawberry juice and concentrate Cut-back juice, respectively. The concentrated Cut-back strawberry juice prior to freezing was found to be rich in ferulic acid, resorcinol and quercetin being 10.09, 0.24 and 731.98 ppm which were by respectively compared to fresh strawberry juice. Quercetin was the dominant compound, it was the only one that found in the two juices after 6 months of frozen storage. While, kaempherol was appeared after freezing for the two types of juices and showed gradual increase  by increasing the duration of frozen storage. The Cut-back strawberry juice showed higher antioxidant activity and viscosity than fresh juice. A slight decrease in viscosity was observed for the two types of juice after storage at -18°C for 6 months. The colour was not stable during the frozen storage at -18°C, The colour values increased in fresh strawberry juice for L*,a*and b* from 12.73, 21.00 and 7.77 to 16.89, 25.94 and 9.91, respectively, but in Cut-back strawberry juice the value of  L* was only increased from 13.23 to13.55 while, a* and b* values decreased  from 25.75 and 8.11 to 22.68 and 7.00, respectively. From results, it could be concluded that the Cut-back strawberry juice had the best quality after 6 months of frozen storage.

DOI

10.21608/zjar.2019.48172

Keywords

Strawberry juice, Cut-back, freezing, vitamin c, Antioxidant activity, colour, viscosity

Authors

First Name

Fathi

Last Name

Fathi

MiddleName

M.M.

Affiliation

Food Sci. Dept., Fac. Agric., Zagazig Univ., Egypt

Email

eng.fathibekhat2010@yahoo.com

City

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Orcid

-

First Name

M.

Last Name

Ragab

MiddleName

-

Affiliation

Food Sci. Dept., Fac. Agric., Zagazig Univ., Egypt

Email

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City

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Orcid

-

First Name

H.

Last Name

Siliha

MiddleName

A.I.

Affiliation

Food Sci. Dept., Fac. Agric., Zagazig Univ., Egypt

Email

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City

-

Orcid

-

First Name

A.

Last Name

Sulieman

MiddleName

M.

Affiliation

Food Sci. Dept., Fac. Agric., Zagazig Univ., Egypt

Email

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City

-

Orcid

-

Volume

46

Article Issue

5

Related Issue

7446

Issue Date

2019-09-01

Receive Date

2019-07-10

Publish Date

2019-09-30

Page Start

1,553

Page End

1,562

Print ISSN

1110-0338

Link

https://zjar.journals.ekb.eg/article_48172.html

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https://zjar.journals.ekb.eg/service?article_code=48172

Order

16

Type

Original Article

Type Code

842

Publication Type

Journal

Publication Title

Zagazig Journal of Agricultural Research

Publication Link

https://zjar.journals.ekb.eg/

MainTitle

EFFECT OF FROZEN STORAGE ON THE QUALITY ATTRIBUTES OF FRESH AND CONCENTRATE CUT-BACK STRAWBERRY JUICES

Details

Type

Article

Created At

22 Jan 2023