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Probiotic Properties and Bile Salt Hydrolase Activity of Some Isolated Lactic Acid Bacteria

Article

Last updated: 22 Jan 2023

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Abstract

EIGHT lactic acid bacterial (LAB) isolates were obtained from food and non-food sources and identified by 16S rRNA gene sequence analysis. Based on the sequencing results, the isolates belong to two species of lactobacilli, Lactobacillus plantarum and L. rhamnosus. These strains were then compared with a reference strain, Lactobacillus casei, to assess various probiotic properties, such as haemolytic activity, histamine formation ability, stress tolerance under certain stress conditions, antibiotic susceptibility and in vitro adhesion ability. Moreover, bile salt hydrolase (BSH) activity was evaluated both qualitatively and quantitatively. The results showed that none of the isolates demonstrated any haemolytic activity or histamine formation. The isolated strains were also tolerant to acidic and alkaline conditions (pH 2.5, 3.5 and 9) for 3 and 6 h, as well as osmotic (3 M NaCl) and heat (55 and 70°C) stress, but were more responsive to oxidative and bile stress. The bacterial isolates also expressed high amounts of BSH, ranging from 90 to 142 U/mg in active cells, compared to L. casei (74 U/mg), which may be useful in cholesterol reduction. All bacterial isolates were resistant to vancomycin and susceptible to amoxicillin, cloxacillin and penicillin. All isolates were also highly hydrophobic (>70%), indicating that they are not easily flushed from the intestines.

DOI

10.21608/ejm.2017.1336.1025

Keywords

LAB, Probiotic properties, Stress tolerance, Bile salt hydrolase

Authors

First Name

Asmaa

Last Name

Negm El-Dein

MiddleName

-

Affiliation

Chemistry of Natural & Microbial Products Department, National Research Center, Giza, Egypt

Email

asmaanegm_084@yahoo.com

City

Giza

Orcid

-

First Name

Azza

Last Name

Noor El-Deen

MiddleName

-

Affiliation

Chemistry of Natural & Microbial Products Department, National Research Center, Giza, Egypt

Email

ranim94@yahoo.com

City

Cairo

Orcid

-

First Name

Sahar

Last Name

Tolba

MiddleName

-

Affiliation

Microbiology Department, Faculty of Science, Ain Shams University, Cairo, Egypt

Email

saharaak@hotmail.com

City

Cairo

Orcid

-

First Name

Einas

Last Name

El-Shatoury

MiddleName

-

Affiliation

Microbiology Department, Faculty of Science, Ain Shams University, Cairo, Egypt

Email

shatourye@hotmail.com

City

Cairo

Orcid

-

First Name

Ghada

Last Name

Awad

MiddleName

-

Affiliation

Chemistry of Natural & Microbial Products Department, National Research Center, Giza, Egypt

Email

ghadaawad18@yahoo.com

City

Cairo

Orcid

-

First Name

Mohamed

Last Name

Ibrahim

MiddleName

-

Affiliation

Microbiology Department, Faculty of Science, Ain Shams University, Cairo, Egypt

Email

kkkmohamed1@hotmail.com

City

Cairo

Orcid

-

First Name

Mohamed

Last Name

Farid

MiddleName

-

Affiliation

Chemistry of Natural & Microbial Products Department, National Research Center, Giza, Egypt

Email

nrcfarid@yahoo.com

City

Cairo

Orcid

-

Volume

52

Article Issue

1

Related Issue

826

Issue Date

2017-12-01

Receive Date

2017-07-18

Publish Date

2017-12-01

Page Start

87

Page End

100

Print ISSN

0022-2704

Online ISSN

2357-0881

Link

https://ejm.journals.ekb.eg/article_4715.html

Detail API

https://ejm.journals.ekb.eg/service?article_code=4715

Order

7

Type

Original Article

Type Code

121

Publication Type

Journal

Publication Title

Egyptian Journal of Microbiology

Publication Link

https://ejm.journals.ekb.eg/

MainTitle

-

Details

Type

Article

Created At

22 Jan 2023