SCREENING, ISOLATION, AND ANTIBACTERIAL ACTIVITY OF ANTIBIOTIC PRODUCING BACTERIA OBTAINED FROM SAPROPHYTIC SOIL SAMPLES


Kavitha Rajendran, Dhamodharan N, Dhivya C

Abstract


ABSTRACT
Objective: The aim of the study was conducted to screen and isolate potential antibiotic producing bacteria from saprophytic soils collected from
Potheri and Nandiambakkam.
Methods: Soil was collected aseptically and subjected to serial dilution. Crowded plate technique was used for the isolation of the colony. Totally
seven isolates were isolated and were screened for their antibacterial activity. The three isolates (S2A, S2B, and S3A) having better zone of inhibition
were selected for morphological, microscopical, and biochemical test to prove their validity. The selected isolates were partially purified. The partially
purified samples further screened for antibacterial activity, minimum inhibitory concentration (MIC) and the isolates, which shown good zone of
inhibition were subjected to 16S rRNA sequencing studies to determine the species.
Results: The isolates screened based on size of the zone formed. Best isolate selected by zone of inhibition was subjected to antibacterial activity,
morphological, microscopical, and biochemical test, partial purification of three isolates and further screened for antibacterial and MIC. The isolate
showed good zone of inhibition compared to others by MIC was selected for 16S rRNA sequencing studies. Genomic DNA extracted from isolate S2B
conforms it belongs to Pseudomonas species which is named as Pseudomonas putida 2435.
Conclusion: The research work revealed that the three isolates showed good antibacterial activity against Gram-positive and Gram-negative bacteria.
The S2B isolate was confirmed to P. putida 2435 by 16S rRNA studies.
Keywords: Isolation of soil microbes, Biochemical characterization, Antimicrobial activity, Minimum inhibitory concentration, 16S rRNA sequencing,
Pseudomonas putida.


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About this article

Title

SCREENING, ISOLATION, AND ANTIBACTERIAL ACTIVITY OF ANTIBIOTIC PRODUCING BACTERIA OBTAINED FROM SAPROPHYTIC SOIL SAMPLES

DOI

10.22159/ajpcr.2017.v10i3.14472

Date

01-03-2017

Additional Links

Manuscript Submission

Journal

Asian Journal of Pharmaceutical and Clinical Research
Vol 10 Issue 3 March 2017 Page: 92-96

Print ISSN

0974-2441

Online ISSN

2455-3891

Statistics

176 Views | 433 Downloads

Authors & Affiliations

Kavitha Rajendran
SRM University
India

Dhamodharan N

Dhivya C


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