International Journal of Pharmaceutical Investigation, 2017, 7, 2, 77-81.
DOI: 10.4103/jphi.JPHI_9_17
Published: July 2017
Type: Original Article
Authors:
Sahar Karami
Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahwaz, Iran.
Mohammad Roayaei
Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahwaz, Iran.
Elnaz Zahedi
Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahwaz, Iran.
Mahmoud Bahmani
VDepartment of Pharmacology, Biotechnology and Medicinal Plants Research Center, Ilam University of Medical Sciences, Ilam, Iran.
Leila Mahmoodnia
Department of Internal Medicine, Shahrekord University of Medical Sciences, Shahrekord, Iran.
Hosna Hamzavi
Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahwaz, Iran.
Mahmoud Rafieian-Kopaei
Department of Pharmacology, Medical Plants Research Center, Basic Health Sciences Institute, Shahrekord, Iran.
ABSTRACT
Objective: The Lactobacillus is a genus of lactic acid bacteria which are regularly rod-shaped, nonspore, Gram-positive, heterogeneous and are found in a wide range of inhabitants such as dairy products, plants and gastrointestinal tract. A variety of antimicrobial compounds and molecules such as bacteriocin are produced by these useful bacteria to inhibit the growth of pathogenic microbes in the food products. This paper aims to examine the isolation of Lactobacillus from local dairies as well as to determine their inhibition effect against a number of pathogens, such as two fungi: Penicillium notatum and Aspergillus fulvous. Materials and Methods: Twelve Lactobacillus isolates from several local dairies. After initial dilution (10−1–10−3) and culture on the setting, de Man, Rogosa and Sharpe-agar, the isolates were recognized and separated by phenotypic characteristics and biochemical; then their antifungal effect was examined by two methods. Results: Having separated eight Lactobacillus isolates, about 70% of the isolates have shown the inhabiting areas of antifungus on the agar-based setting, but two species Lactobacillus alimentarius and Lactobacillus delbrueckii have indicated a significant antifungal effect against P. notatum and A. fulvous. Except bacteriocin, lactic acid and acetic acid, the inhibitor substance is produced by these bacteria. Conclusion: Given the vitality of Lactobacillus in human health, recognition and isolation of the species producing compound in antagonist to the pathogens existing in the food products can be a helpful and effective step toward maintaining the valuable native Lactobacillus and using them in the dairy industries.
Keywords: Antifungal effects, Bacteriocin, Dairy products, Lactobacillus .