نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.
2 مرکز تحقیقات سلامت فراوردههای غذایی، دارویی و طبیعی، دانشگاه علوم پزشکی گلستان، گرگان، ایران.
3 دانشگاه علوم کشاورزی و منابع طبیعی گرگان
چکیده
ارزیابی خصوصیات ضدمیکروبی و پروبیوتیکی فلورمیکروبی جدا شده از شبه غلات تخمیرشده جهت تامین کشتهای میکروبی همراه و آغازگر از اهمیت بهسزایی برخوردار است. در این پژوهش، مخمر غالب از خمیرترش باکویت، جداسازی و با استفاده از PCR شناسایی گردید. سپس ویژگیهای پروبیوتیکی و همچنین اثر ضدقارچی این جدایه مخمری بر روی Aspergillus niger وAspergillus flavus مورد مطالعه قرارگرفت. توالییابی محصولات PCR منجر به شناسایی مخمر Pichia kudriavzevii بهعنوان جدایه مخمری خمیرترش باکویت شد. نرخ زندهمانی جدایه مذکور پس از تیمار متوالی اسید و صفرا در مقایسه با نمونه شاهد 26/79 درصد بود. همچنین اثر ضدباکتریایی آن در برابر Escherichia coli نسبت به سایر عوامل غذازاد مورد مطالعه به شکل معنیداری (05/0p<) بیشتر بود. با این حال، رشد Listeria monocytogenes در حضور جدایه مخمری 50/19 درصد کاهش یافت اما این جدایه، اثر بازدارندهای بر Salmonella entrica نداشت. قابلیتهای آبگریزی و خوداتصالی جدایه مذکور نیز بهترتیب، 07/64 و 40/67 درصد تعیین گردید. علاوه بر این، جدایه مخمری نسبت به تمامی آنتیبیوتیکهای مورد بررسی، مقاومت نشان داد اما در برابر آنتیمایکوتیکهای کتوکونازول و فلوکونازول، مقاوم و همچنین نسبت به ایتراکونازول دارای حساسیت نسبی بود. این جدایه مخمری، فاقد فعالیت همولیتیکی بود و اثر ضدقارچی آن در برابر A. niger و A. flavus نیز مورد تایید قرار گرفت. بر این اساس، جدایه P. kudriavzevii از قابلیت مناسبی برای استفاده بهعنوان کشت پروبیوتیک و یا محافظت کننده در صنایع تخمیری برخوردار میباشد.
کلیدواژهها
موضوعات
عنوان مقاله [English]
Evaluation of probiotic and antifungal properties of the yeast isolated from buckwheat sourdough
نویسندگان [English]
- Sara Shahryari 1
- Alireza Sadeghi 1
- Maryam Ebrahimi 2
- Alireza Sadeghi Mahoonak 1
- Ali Mayedi 3
1 Department of Food Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Gonrgan, Iran
2 Health Research Center of Food, Drug and Natural Products, Golestan University of Medical Science, Gonrgan, Iran.
3 Gorgan
چکیده [English]
[1]Introduction: Evaluation of antimicrobial and probiotic properties of the microbiota isolated from fermented pseudo-cereals is important in order to prepare adjunct and starter cultures. Probiotics are live and active microorganisms that, if used in sufficient numbers, help the microbial balance of the gastrointestinal tract and improve its function. Probiotics are also used as a substitute for antibiotics and synthetic preservatives in the prevention and treatment of complications of many infectious and pathogenic gastrointestinal pathogens. Probiotic microorganisms include lactic acid bacteria (LAB) and yeasts, and despite numerous reports on the probiotic properties of LAB, the probiotic properties of yeasts are less reported. Probiotic yeasts are organisms resistant to antibacterial compounds and effective against pathogens, which can rapidly increase their population in the gastrointestinal tract. These yeasts have several properties such as antimicrobial effects, resistance to acid and bile, binding to mucosal surfaces, inhibitory activity against pathogens and also the inability to transmit antibiotic resistance genes. In the present study, after isolation of the predominant yeast from buckwheat sourdough, the probiotic and antifungal properties of the isolate were investigated. Based on the literature review, no study has been presented to evaluate the probiotic and antifungal capabilities of yeasts isolated from buckwheat sourdough.
Materials and Methods: In the present study, predominant yeast was isolated from buckwheat sourdough, and then it was identified using PCR. Subsequently, probiotic properties of the isolate including survival in present of low pH and bile salt, antibacterial effect, antibiotic susceptibility assay, aggregation, hydrophobicity, haemolytic activity as well as its antifungal activity against Aspergillus niger and Aspergillus flavus were studied. After spontaneous fermentation of buckwheat, predominant yeast was isolated using ten-fold dilution of the sourdough sample and its spread plating. The predominant isolate was identified through PCR amplification of a 650 bp target sequence from its ribosomal gene and sequencing of the PCR product. Then, survival of the yeast was determined at pH=2 and 0.3% bile salt as simulated gastrointestinal conditions. Subsequently, simultaneous culture of the yeast with some food-borne indicator bacteria in chromogenic media was used to investigate the inhibitory activity of the isolate against the studied bacteria. After that, resistance of the yeast isolate against the common antibiotics and some antimycotic agents was evaluated using disc method. Co-aggregation ability and hydrophobicity capability of the isolate were also determined based on the absorbance tests. In vitro safety of the yeast isolate was checked through its cultivation on blood agar containing sheep blood. Next stage, overlay bioassay was conducted to investigate antifungal effect of the yeast on the selected fungi. Finally, one way analysis of variance (ANOVA) with the least significant differences (LSD) post hock at p<0.05 was used for statistical analysis of the data.
Results and Discussions: Sequencing results of the PCR products led to the identification of Pichia kudriavzevii as predominant yeast isolated from buckwheat sourdough. Survival rate of the isolate after treatment in simulated gastrointestinal conditions was 79.26% in comparison with the control. Antibacterial effect of the isolate on Escherichia coli was also significantly (P<0.05) higher than the other studied food-borne agents. Meanwhile, the growth of Listeria monocytogenes was decreased 19.50% in the present of the isolate. Whereas, the yeast isolate had no inhibitory effect on Salmonella enterica. Hydrophobicity and auto-aggregation capabilities of the isolate were also 64.07 and 67.40%, respectively. Furthermore, the isolate showed resistance towards all of the antibiotics tested, while it was resistant against ketoconazole and fluconazole, and the yeast was semi-sensitive towards itraconazole as antimycotic agents. The yeast isolate had no hemolytic activity, and its antifungal activity against A. niger and A. flavus was also verified. Accordingly, it is concluded that P. kudriavzevii isolate exhibits proper potential to be used as probiotic or protective culture in fermentation industries.
In accordance with the results, probiotic characteristics of P. kudriavzevii (as the predominant yeast isolated from buckwheat sourdough) were approved. Accordingly, the isolate can be used as a potential probiotic culture in food industries.
کلیدواژهها [English]
- Yeast isolate
- Buck wheat sourdough
- Probiotic properties
- Antifungal effect
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