یافته های نوین در علوم زیستی

سیمان سازی زیستی و رسوب کلسیت توسط عصاره درون سلولی باکتری اسپوروسارسینا پاستوری

نویسندگان

مصطفی حسین پور
محمد محمدی
غلامرضا قزلباش

گروه زیست شناسی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده
سیمان سازی زیستی فرایند جدیدی است که در آن باکتری های هیدرولیز کننده اوره و یا آنزیم اوره­آز آزاد با تجزیه اوره و افزایش pH محیط و فعل و انفعالات شیمیایی در حضور یون کلسیم موجب تشکیل کلسیت می­شوند. امروزه نانوکلسیت کاربرد فراوانی در زمینه مهندسی مانند افزایش مقاومت خاک و بتن و همچنین در پزشکی مانند حمل دارو و درمان سرطان دارد. هدف از این مطالعه، بررسی شرایط آزمایشگاهی تولید ذرات نانو کلسیت با کیفیت، اندازه مناسب و خالص توسط عصاره آنزیمی اسپوروسارسیناپاستوری برای استفاده در مطالعات پزشکی و مهندسی بود. برای این منظور باکتری اسپوروسارسینا پاستوری در محیط نوترینت براث حاوی اوره و نیکل کشت داده شد و با رسیدن به زمان مناسب سلول­ها جدا و شست و شو شدند. سپس به وسیله سونیکاسیون عصاره آنزیمی آن­ها استخراج شد و سپس تولید رسوب کلسیت در غلطت­های مختلف اوره و کلسیم کلراید و مقادیر مختلف آنزیم و دما مورد مطالعه قرار گرفت. کیفیت کریستال­های کلسیت تولید شده و نسبت آن در مقایسه با دیگر کریستال­ها توسط آنالیزXRD و SEM مورد بررسی قرار گرفت. با توجه به نتایج آنالیز XRD مشخص شد که در اوره 5/0 مولار و کلسیم کلراید 25/0 مولار بیشترین میزان کلسیت با 96 درصد و کمترین محصولات جانبی تولید می­شود. بررسی هیستوگرام اندازه ذرات در نمونه حاوی 5/0 مولار اوره و 25/0 مولار کلسیم کلراید مشخص کرد که طیف ذرات بین 50 تا 100 نانومتر است. ماهیت و جنس کریستال­ها توسط میکروسکوپ الکترونی مطالعه شد و آنالیزهای EDX حضور کلسیم، اکسیژن و کربن را نشان داد. طبق نتایج حاصل مشخص شد که با افزایش غلظت اوره و کلسیم، طیف اندازه ذرات بزرگتر شده و همچنین درصد کلسیت تولید شده در غلظت های پایین اوره و کلسیم، بیشتر از غلظت­های بالا است.


کلیدواژه‌ها

اسپوروسارسینا پاستوری
اوره‌آز
BEICP
XRD
SEM-EDX

عنوان مقاله English

Biocementation and calcite precipitation by intracellular extract of Sporosarcina pasteurii

نویسندگان English

Mostafa Hosseinpour
Mohammad Mohammadi
Gholam Reza Ghezelbash
Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده English

Biological cementation is a new process in which urea hydrolysis bacteria or free urease enzyme decompose urea and increases the pH of the environment and chemical interactions in the presence of calcium ions to form calcite. Nowadays, nano-calcite is widely used in engineering, such as increasing the strength of soil and concrete, as well as in medicine, such as drug delivery and cancer treatment. This study aimed to investigate the laboratory conditions for producing nano-calcite particles with appropriate quality, size and purity by Sporosarcina pasteurii enzyme extract for use in medical and engineering studies. This investigation aimed to make calcite by S. pasteurii enzyme extract and optimize influential factors in calcite production. For this purpose, the bacterium S. pasteurii was cultured in nutrient broth containing urea and nickel, and upon reaching the appropriate time, the cells were separated and washed. Then, their enzyme extract was prepared by sonication, and calcite precipitation was studied in different amounts of urea, calcium chloride, enzyme and temperature. The quality of produced calcite crystals and their ratio compared to other crystals were investigated by XRD and SEM analyses. According to the results of XRD analysis, it was found that in 0.5 M urea and 0.25 M calcium chloride, the highest amount of calcite is produced with 96%, and the least side products are produced. Examining the particle size histogram in the sample containing 0.5 M urea and 0.25 M calcium chloride revealed that the range of particles were between 50 and 100 nm. The nature and type of crystals were studied by electron microscopy, and EDX analysis showed the presence of calcium, oxygen, and carbon. According to the results, it was found that by the increase of the concentrations of urea and calcium, the range of particle size became larger. Also, the percentage of calcite produced in low urea and calcium chloride concentrations is higher than those in high concentrations.

کلیدواژه‌ها English

Sporosarcina pasteurii
Urease
BEICP
XRD
SEM-EDX
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  • تاریخ دریافت 18 خرداد 1405
  • تاریخ انتشار 18 خرداد 1405

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