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利用哈密瓜汁生产细菌纳米纤维素:统计优化与特性研究。

Bacterial nanocellulose production using Cantaloupe juice, statistical optimization and characterization.

机构信息

Department of Bioprocess Development, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Alexandria, 21934, Egypt.

Microbial Biotechnology Department, Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat City, Egypt.

出版信息

Sci Rep. 2023 Jan 2;13(1):51. doi: 10.1038/s41598-022-26642-9.

Abstract

The bacterial nanocellulose has been used in a wide range of biomedical applications including carriers for drug delivery, blood vessels, artificial skin and wound dressing. The total of ten morphologically different bacterial strains were screened for their potential to produce bacterial nanocellulose (BNC). Among these isolates, Bacillus sp. strain SEE-3 exhibited potent ability to produce the bacterial nanocellulose. The crystallinity, particle size and morphology of the purified biosynthesized nanocellulose were characterized. The cellulose nanofibers possess a negatively charged surface of - 14.7 mV. The SEM images of the bacterial nanocellulose confirms the formation of fiber-shaped particles with diameters of 20.12‒47.36 nm. The TEM images show needle-shaped particles with diameters of 30‒40 nm and lengths of 560‒1400 nm. X-ray diffraction show that the obtained bacterial nanocellulose has crystallinity degree value of 79.58%. FTIR spectra revealed the characteristic bands of the cellulose crystalline structure. The thermogravimetric analysis revealed high thermal stability. Optimization of the bacterial nanocellulose production was achieved using Plackett-Burman and face centered central composite designs. Using the desirability function, the optimum conditions for maximum bacterial nanocellulose production was determined theoretically and verified experimentally. Maximum BNC production (20.31 g/L) by Bacillus sp. strain SEE-3 was obtained using medium volume; 100 mL/250 mL conical flask, inoculum size; 5%, v/v, citric acid; 1.5 g/L, yeast extract; 5 g/L, temperature; 37 °C, NaHPO; 3 g/L, an initial pH level of 5, Cantaloupe juice concentration of 81.27 percent and peptone 11.22 g/L.

摘要

细菌纳米纤维素已被广泛应用于生物医药领域,包括药物载体、血管、人工皮肤和伤口敷料。从十种形态不同的细菌菌株中筛选出具有生产细菌纳米纤维素(BNC)潜力的菌株。在这些分离物中,芽孢杆菌 SEE-3 菌株表现出产生细菌纳米纤维素的强大能力。对纯化生物合成纳米纤维素的结晶度、粒径和形态进行了表征。纤维素纳米纤维具有-14.7 mV 的带负电荷表面。细菌纳米纤维素的 SEM 图像证实了纤维状颗粒的形成,其直径为 20.12-47.36nm。TEM 图像显示针状颗粒,直径为 30-40nm,长度为 560-1400nm。X 射线衍射表明,所得到的细菌纳米纤维素具有 79.58%的结晶度值。FTIR 光谱显示出纤维素结晶结构的特征谱带。热重分析显示出较高的热稳定性。使用 Plackett-Burman 和中心复合设计对细菌纳米纤维素的生产进行了优化。使用适宜性函数,从理论上确定并通过实验验证了获得最大细菌纳米纤维素产量的最佳条件。芽孢杆菌 SEE-3 的最大 BNC 产量(20.31g/L)是在培养基体积为 100mL/250mL 锥形瓶、接种量为 5%(v/v)、柠檬酸为 1.5g/L、酵母提取物为 5g/L、温度为 37°C、NaHPO 为 3g/L、初始 pH 值为 5、甜瓜汁浓度为 81.27%和蛋白胨 11.22g/L 的条件下获得的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a835/9807561/c8b99cc09199/41598_2022_26642_Fig6_HTML.jpg

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