نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار،گروه علوم زیستی، دانشکده علوم پایه، دانشگاه کردستان، سنندج، ایران

2 کارشناسی ارشد بیوشیمی، گروه علوم زیستی، دانشکده علوم پایه، دانشگاه کردستان، سنندج، ایران

3 دانشیار،گروه علوم زیستی، دانشکده علوم پایه، دانشگاه کردستان، سنندج، ایران

چکیده

مقدمه: شناسایی و معرفی ترکیبات جدید طبیعی ضد میکروبی در برابر عوامل بیماریزای انسانی و گیاهی مورد توجه پژوهشگران می باشد. مطالعه حاضر با هدف مقایسه ترکیبات شیمیایی، اثرات ضد میکروبی و آنتی اکسیدانی چای سیاه و چای سبز انجام گرفت. روشها: عصاره آبی و متانولی برگ چای سیاه و چای سبز تهیه و ترکیبات عصاره های متانولی با GC- Mass شناسایی، اثرات ضد باکتری با روش انتشار دیسک و حداقل غلظت مهارکنندگی (MIC) و ویژگی آنتی اکسیدانی به روش DPPH اندازه گیری گردید. نتایج و بحث: کافئین ترکیب اصلی تشکیل دهنده عصاره چای سبز و چای سیاه است که مقدار آن به ترتیب در این دو عصاره 97/82، و 25/86 درصد می‌باشد. حداقل غلظت مهارکنندگی عصاره چای سبز در برابر اشرشیاکلی، استافیلوکوکوس اورئوس، سودوموناس سیرینگه بطور معنی دار سه برابر بیشتر از مهارکنندگی عصاره چای سیاه می باشد. مهار-کنندگی عصاره چای سبز در برابر زانتوموناس کمپستریس مهار کنندگی عصاره چای سیاه در برابر سودوموناس سیرینگه بطور معنی دار بیشتر از سه باکتری دیگر است. بسیاری از اثرات درمانی و پیشگیری مرتبط با مصرف چای سبز و چای سیاه را می‌توان مرتبط با ظرفیت نسبتا بالای مهار رادیکالهای آزاد در نظر گرفت. ظرفیت مهار رادیکالهای آزاد و آنتی‌اکسیدانی چای سبز بطور معنی دار یک و نیم برابر چای سیاه می باشد. توانایی مهار‌کنندگی هر دو عصاره در برابر پاتوژن‌های گیاهی بطور نسبی و معنی-دار بیشتر از پاتوژن‌های انسانی است. از فراورده های مختلف و شاید پسماند چای سیاه و چای سبز برای کنترل میکروارگانیزم‌های آسیب‌رسان می‌توان استفاده کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of chemical compounds, antioxidant and antimicrobial effects of Camellia sinensis black tea and green tea leaf extract on plant pathogenic bacteria (Xanthomonas campestris and Pseudomonas syringae) and human pathogenic b

نویسندگان [English]

  • Masoud Haidarizadeh 1
  • Fatemeh Alijani 2
  • Morahem Ashengroph 3
  • sajjadd atashi 2

1 Corresponding Author. Assistant Professor of Plant Physiology, Department of Biological Science, Faculty of Science, University of Kurdistan, Sanandaj, Iran

2 M.Sc in Cellular and Molecular Biology, Department of Biological Science, Faculty of Science, University of Kurdistan, Sanandaj, Iran

3 Associated Professor of Microbiology, Department of Biological Science, Faculty of Science, University of Kurdistan, Sanandaj, Iran

چکیده [English]

Introduction: Identifying and introducing new natural antimicrobial compounds against pathogenic agents is of concern to researchers. The present study was conducted with the aim of comparing the chemical compounds, antimicrobial and antioxidant effects of black and green tea. Methods: Aqueous and methanolic extracts of black and green tea leaves were prepared and the compounds of the methanolic extracts were identified by GC-Mass, antibacterial effects were measured by the disk diffusion method, the minimum inhibitory concentration (MIC) the antioxidant property by the DPPH method. Results and discussion: Caffeine is the main component of green and black tea extracts, and its amount is 82.97% and 86.25% in these extracts, respectively. The minimum inhibitory concentration of green tea extract against Escherichia coli, Staphylococcus aureus, and Pseudomonas syringae is significantly three times higher than that of black tea extract. The inhibitory capacity of green tea extract against Xanthomonas campestris and the inhibitory capacity of black tea extract against Pseudomonas syringae is significantly higher than the other bacteria. Many of the effects related to green and black tea can be considered related to the relatively high capacity of inhibiting free radicals. The results of this research showed that the free radical and antioxidant capacity of green tea is significantly one and a half times higher than black tea. The inhibitory ability of the extract against plant pathogens is relatively and significantly higher than human pathogens. Different products and perhaps the waste of black tea and green tea can be used to control harmful microorganisms.

کلیدواژه‌ها [English]

  • " antioxidant
  • " antibacterial
  • "
  • "Minimum Inhibitory Concentration
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