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Evaluation of probiotic attributes of Lactobacillus sp. isolated from cow and buffalo curd samples collected from Kandy

Authors:

M F F Shuhadha ,

Department of Animal and Food Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, LK
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G J Panagoda,

Department of Oral Medicine and Periodontology, Faculty of Dental Sciences, University of Peradeniya, LK
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T Madhujith,

Department of Food Science and Technology, Faculty of Agriculture, University of Peradeniya, Peradeniya, LK
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N W I A Jayawardana

Department of Animal and Food Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, LK
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Abstract

Introduction Curd is a potential source of probiotic Lactobacillus species.

 

Methods This study was carried out to isolate and characterize Lactobacillus species available in curd samples sold in the market. Nine curd samples prepared using cow or buffalo milk were obtained from a local market in the Kandy district.

 

Results Seven isolates (LB 1-7) were identified based on their colony morphology and biochemical characteristics and evaluated for probiotic attributes such as low pH tolerance, resistance to bile salts, antimicrobial activity against Escherichia coli and Pseudomonas aeruginosa, antibiotic activity against erythromycin, chloramphenicol and norfloxacin, haemolytic activity and DNase activity. All isolates were able to grow at low pH (pH=3.0) and were able to survive at 0.3% bile salt, however, the viability decreased with time. LB7 showed very low viability with bile salt compared to others. All isolates exhibited antimicrobial activity against the two pathogenic organisms tested. Two isolates (LB1 and LB2) showed maximum zone of inhibition (18±1.13mm) against E.coli and four isolates (LB1, LB2, LB6 and LB7) against P.aeruginosa. Only LB6 and LB7 exhibited resistance to all three antibiotics tested while the other isolates were sensitive. In general, a higher sensitivity was shown against erythromycin and chloramphenicol compared to norfloxacin. All isolates exhibited d-haemolysis (non-haemolysis) while none of the isolates showed any DNase activity.

 

Conclusions Tested isolates showed probiotic attributes such as resistance to low pH, tolerance to bile salt, antimicrobial resistance, antibiotic activity, non-haemolysis and no DNase activity.

How to Cite: Shuhadha, M.F.F. et al., (2017). Evaluation of probiotic attributes of Lactobacillus sp. isolated from cow and buffalo curd samples collected from Kandy. Ceylon Medical Journal. 62(3), pp.159–166. DOI: http://doi.org/10.4038/cmj.v62i3.8519
Published on 25 Sep 2017.
Peer Reviewed

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