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Öğe A novel Lactiplantibacillus plantarum strain: probiotic properties and optimization of the growth conditions by response surface methodology(Springer, 2024) Gokmen, Goekhan Gurur; Sariyildiz, Seda; Cholakov, Remzi; Nalbantsoy, Ayse; Baler, Biray; Aslan, Emek; Kisla, DuyguThe objective of this study is to explore the probiotic properties and optimal growth conditions of Lactiplantibacillus plantarum BG24. L. plantarum BG24 exhibited a remarkable ability to utilize lactose, and to grow under acidic conditions and in the presence of high levels of bile salts. The strain showed the highest antibacterial activity against L. monocytogenes Scott A (zone of inhibition: 26 mm). L. plantarum BG24 was found to be resistant to 8 of the tested 19 antibiotics using the disc diffusion method.and its multiple antibiotic resistance (MAR) index was calculated as 0.421. The adhesion rate to human intestinal epithelial Caco-2 cells was determined as 37.51%. The enzyme profile of L. plantarum BG24 was investigated using API ZYM test kit and the highest enzymatic activities were found for Leucine arylamidase, beta-glucosidase, Valine arylamidase, beta-galactosidase and N-acetyl-beta-glucosaminidase. L. plantarum BG24 strain showed higher microbial growth under static conditions (6.60 OD600) compared to 100 rpm (5.73 OD600) and 200 rpm (5.02 OD600) shaking speed due to its facultative anaerobic characteristic. However, different inoculation rates and glucose addition did not make a statistically significant difference on biomass formation (p > 0.05). The specific growth rate of L. plantarum BG24 was 0.416 h(-1), the doubling time was 1.67 h, and the biomass productivity value was 0.14 gL(-1) h(-1) in the original MRS broth (pH 5.7) while higher values were found as 0.483 h(-1), 1.43 h and 0.17 gL(-1) h(-1), respectively, in MRS broth (pH 6.5) medium enriched with 5 g/L yeast extract. The stirred tank bioreactor was used to optimise the growth of BG24 strain. The process variables was optimized at 0.05 vvm of aeration rate, 479 rpm of agitation speed, 3% of inoculation rate and 18 h of incubation time. The maximum biomass (g/L) production was obtained as 3.84 g/L at the optimized conditions.Öğe Bioprocesses for Sustainable Bioeconomy: Fermentation, Benefits, and Constraints(Springer International Publishing, 2023) Aslan, Emek; Sargin, SayitThe bioeconomy concept is a path from a fossil-based system to a biobased one using renewable biological resources with a holistic approach. This concept aims for sustainable economic development by producing value-added products. The utilization of agro-industrial wastes for value-added end products focused on microbial fermentation. Industrial fermentation is the mass cultivation using cells in highly controlled, closed bioreactors. Although the basis of these bioprocesses depends on submerged fermentation (SMF), the solid-state fermentation (SSF) technique gained interest for producing several products in the last decades. The food and agricultural industries generate a considerable amount of agroindustrial wastes continuously which are rich in nutrients and have a high potential to be used as raw material. Food waste valorization is a potent tool for enabling the production of several products by benefiting the microorganisms and is a promising field from the bioeconomy perspective. Within the scope of this chapter, fermentation processes and applications, some of the value-added products related to the different biotechnology fields, and existing and potential integrated systems in terms of circular bioeconomy are examined by giving particular emphasis to SSF. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.Öğe Renewable Energy Through Achievements and Challenges(Springer Science+Business Media, 2025) Aslan, Emek; Yarkent, Çağla; Öncel, Suphi Şurişvan; Sargın, SaitIn the present era, fossil fuels constitute a substantial energy demand. These resources, including coal, natural gas, and petroleum, have been extensively utilized for energy production, and it is anticipated that they will continue until 2050. Using nonrenewable energy sources has the consequence of enhancing the ecological footprint. The most significant detrimental consequences of using fossil fuels include resource depletion, climate change, and global warming. The energy industry must assume a significant role in the reduction of emissions. The expedient adoption of clean energy technology can achieve this. Increasing research dedicated to developing innovative technologies for renewable energy sources to replace fossil fuels is a promising means of achieving this goal. Unquestionably, producing renewable energy is an absolute necessity for the continued existence of life on Earth. Renewable energy is generated from many sources, employing many natural resources. Implementing a conceptual approach to renewable energy can facilitate more significant comprehension of the subject matter among those interested in the field and those less well versed in the topic. Given the current global consensus on renewable energy, there is a pressing need to consolidate the underlying concepts for local governments, individuals employed in this field by private companies, and the public alike. Considering this, the “renewable energy concept” definition can significantly contribute to this endeavor. It is crucial to incorporate up-to-date technologies and artificial intelligence (AI) to achieve solutions to assist with the current energy requirement objectives. This approach can assist in evaluating the efficacy of previous strategy implementation across various domains, including agriculture, communications, environmental informatics, and economics. Several technical and social recommendations can be put forward to address some shortcomings. Should these recommendations be implemented, it would increase the utilization of existing renewable energy resources, which would have a greater capacity and a reduced environmental impact. © 2025 The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.Öğe Scale-up rules and reactor accessories(Elsevier, 2025) Aslan, Emek; Demirden, S. Furkan; Kimiz-Gebologlu, Ilgin; Sargın, Sait; Öncel, Suphi ŞurişvanThe scale-up has critical importance for the development of bioprocess from bench, pilot to industrial scales to fulfill the path of the laboratory to market. Different strategies are employed to sustain bioprocess yield and productivity in larger volumes. While these strategies are primarily based on geometric aspects of bioreactors, vital parameters such as agitation or aeration for the requirements of living systems are also essential. Therefore the scale-up must take into account as a whole not only classical parameters such as power input and tip speed but also the effects of environmental parameters including physiology. These features are specific to each production and related to the complex response of living systems to rapid changes in environmental conditions under heterogeneous growing conditions, which mostly depend on rheology. While successful scale-up is crucial, in terms of rapid time-to-market, it is also important for transferring the process between various production facilities where the type, size, or design of the bioreactor changes. This chapter aims to focus on the theory of scale-up, comprising its definition and basics, without underestimating the engineering background and novel perspectives highlighting bioreactors. © 2025 Elsevier Inc. All rights reserved.
