مطالعه سینتیک رشد و تولید کمپلکس کیتین- گلوکان در کشت غوطه ور قارچ دارویی گنودرما لوسیدوم

نوع مقاله : پژوهشی اصیل

نویسندگان

1 گروه مهندسی علوم زیستی، دانشکده علوم و فنون نوین، دانشگاه تهران،

2 گروه مهندسی شیمی، دانشکده مهندسی نفت و پتروشیمی، دانشگاه حکیم سبزواری

چکیده
گنودرما لوسیدوم یکی از شناخته شده‌ترین قارچ‌های دارویی جهان است. این قارچ حاوی مقادیر قابل توجهی از متابولیت‌های ثانویه و پلی‌ساکاریدهای خارج و داخل سلولی می‌باشد که هریک از آن‌ها مصرف دارویی و پزشکی بخصوصی دارند. کمپلکس کیتین گلوکان (CGC) از پلی‌ساکاریدهای مهم این قارچ محسوب می شود. از بین ده محیط کشت متفاوت که مورد آزمایش قرار گرفت، محیط کشت دارای مقدار 24 گرم در لیتر PDB و 1 گرم در لیتر پپتون با میزان وزن خشک سلولی برابر 6/11 گرم در لیتر، مقدار CGC تولیدی برابر 2/3 گرم در لیتر و 6/27 درصد CGC در وزن خشک سلولی، به‌عنوان محیط کشت مناسب انتخاب شد. برای مشخصه یابی CGC تولید شده آنالیز FTIR و بررسی خاصیت ضدباکتریایی انجام شد. پروفایل زمانی رشد و تولید CGC به مدت 20 روز به دست آمد و با استفاده از مدل رشد لجستیک و لودکینگ- پایرت، ضریب ویژه رشد قارچ گنودرما لوسیدوم (mµ) و نرخ بهره‌وری حجمی تولید محصول به ترتیب 1- day5274/ و0 g CGC L -1 day-1 85/2 محاسبه شد. نتایج نشان داد که انطباق خوبی بین دادهای تجربی رشد سلولی با مدل لجستیک (9679/0 R2 =) و داده های تجربی تولید CGC با مدل لودکینگ-پایرت (9901/0 R2 =) وجود دارد. مدل سینتیکی ارائه شده می‌تواند راهنمایی موثر برای کنترل فرآیند تخمیر در تولید صنعتی پلیمر ارزشمند CGC باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

A Study of growth and chitin-Glucan complex production kinetics in submerged culture of medicinal fungus Ganoderma lucidum

چکیده English

Ganoderma lucidum is one of the best-known medicinal mushrooms in the world. It contains substantial amounts of intra- and extracellular secondary metabolites and polysaccharides each with its own specific medicinal and medical uses. The chitin-glucan complex (CGC) is considered one of the important polysaccharides of this fungus. Among the 10 various culture media that were studied, the one containing PDB at 24g/l, peptone at 1g/l, and with the dry weight of cells of 11.6 g/l, the produced CGC of 3.2g/l, and with 27.6 percent CGC in the dry weight of the cells was selected as the suitable culture medium. FTIR analysis was performed for characterization of the produced CGC and its antibacterial properties were studied. The obtained time profile for CGC growth and production was 20 days and, using the logistic growth model and the Lodding-Pipet equation, the calculated specific growth rate of Ganoderma lucidum (μm) and the volumetric productivity for the product were 2.85 g CGC L-1day-and 0.5274 day-1, respectively. The calculations indicated there were high degrees of conformance between the model and the laboratory data related to kinetic characteristics of cell growth (R2= 0.9679) and to CGC production (R2=0.9901). Therefore, the introduced kinetic model can serve as an effective guide to control the fermentation process in industrial production of the valuable CGC polymer.

کلیدواژه‌ها English

Ganoderma lucidum
Chitin-glucan polysaccharide
submerged culture
Kinetic model
Medicinal mushroom
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