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selenium nanoparticle

Karsten Klauke, Dzmitry H Zaitsau, Mark Bülow, Li He, Maximilian Klopotowski, Tim-Oliver Knedel, Juri Barthel, Christoph Held, Sergey P Verevkin, Christoph Janiak
Three selenoether-functionalized ionic liquids (ILs) of N-[(phenylseleno)methylene]pyridinium (1), N-(methyl)- (2) and N-(butyl)-N'-[(phenylseleno)methylene]imidazolium (3) with bis(trifluoromethanesulfonyl)imide anions ([NTf2]) were prepared from pyridine, N-methylimidazole and N-butylimidazole with in situ obtained phenylselenomethyl chloride, followed by ion exchange to give the desired compounds. The crystal structures of the bromide and tetraphenylborate salts of the above cations (1-Br, 2-BPh4 and 3-BPh4) confirm the formation of the desired cations and indicate a multitude of different supramolecular interactions besides the dominating Coulomb interactions between the cations and anions...
March 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Ding Xu, Lichen Yang, Yu Wang, Gejiao Wang, Christopher Rensing, Shixue Zheng
Elemental selenium nanoparticles (SeNPs) are useful in medicine, environmental remediation and in material science. Biosynthesized SeNPs (BioSeNPs) by bacteria are cheap, eco-friendly and have a lower cytotoxicity in comparison with chemically synthesized ones. Organic matters were found to cap on the surface of BioSeNPs, but the functions were still not entirely clear. The purified BioSeNPs were coated in a thick layer of organic substrates observed by transmission electron microscopy (TEM). Fourier Transform Infrared (FT-IR) and quantitative detection of the coating agents showed that one gram of purified BioSeNPs bound 1069 mg proteins, 23 mg carbohydrates and only very limited amounts of lipids...
March 19, 2018: Scientific Reports
Mónica Álvarez-Pérez, Wesam Ali, Małgorzata Anna Marć, Jadwiga Handzlik, Enrique Domínguez-Álvarez
Selenium and selenocompounds have attracted the attention and the efforts of scientists worldwide due to their promising potential applications in cancer prevention and/or treatment. Different organic selenocompounds, with diverse functional groups that contain selenium, have been reported to exhibit anticancer and/or chemopreventive activity. Among them, selenocyanates, selenoureas, selenoesters, selenium-containing heterocycles, selenium nanoparticles, selenides and diselenides have been considered in the search for efficiency in prevention and treatment of cancer and other related diseases...
March 10, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jinghuan Luo, Hui Chen, Shihu Hu, Chen Cai, Zhiguo Yuan, Jianhua Guo
Anaerobic oxidation of methane (AOM) plays a crucial role in controlling the flux of methane from anoxic environments. Sulfate-, nitrite-, nitrate-, and iron-dependent methane oxidation processes have been considered to be responsible for the AOM activities in anoxic niches. Here, we report nitrate-reducing AOM microorganisms, enriched in a membrane biofilm bioreactor (MBfR), are able to couple selenate reduction to AOM. According to ion chromatography (IC), X-ray photoelectron spectroscopy (XPS) and long-term bioreactor performance, we reveal that soluble selenate was reduced to nanoparticle elemental selenium...
March 13, 2018: Environmental Science & Technology
Muhammad Saleem Asghar, Naureen Aziz Qureshi, Farhat Jabeen, Muhammad Saleem Khan, Muhammad Shakeel, Abdul Shakoor Chaudhry
Various applications of zinc oxide nanoparticles (ZnO NPs) can increase pollution in aquatic environments. Consequently, pollution can cause toxicity in fish as indicated by oxidative stress, hematotoxicity, and changes in gill and liver histology. Selenium is known for its antioxidant potential in scavenging the free radicals generated during ZnO NP-induced oxidative stress. This study tested the ameliorative role of selenium against ZnO NP-induced toxicity in freshwater fish Catla catla. Four groups of replicated fish, representing control, selenium-treated, ZnO NP-treated, and ZnO NPs+selenium-treated, were used in this study...
March 12, 2018: Biological Trace Element Research
Mengjuan Shi, Cunli Zhang, Ivan Fan Xia, Siu To Cheung, Kwong Sen Wong, Ka-Hing Wong, Doris W T Au, David E Hinton, Kevin W H Kwok
Selenium (Se) is an essential element and its biological activity is related to its speciation. It is also well-known that in excess it can cause teratogenesis in fish and birds. In this study we compared dietary toxicity of elemental selenium nanoparticles (SeNPs) with selenite and selenomethionine (Se-Met). Japanese medaka (Oryzias latipes) was used as a laboratory model to determine Se effects on adults and their offspring. Adult females were individually exposed using a dry diet fortified with 0, 10 or 20 µg/g of the three Se species for 7 days and then allowed to breed for 3 days...
March 8, 2018: Ecotoxicology and Environmental Safety
Małgorzata Kiełczykowska, Joanna Kocot, Marek Paździor, Irena Musik
Selenium is a trace element which fulfils important functions in the organism. Its deficit may cause acute disorders, but an overdose can also lead to severe consequences. The functions of selenium in the organism are mainly connected with its antioxidant properties, as it is an essential part of important antioxidant enzymes. Disturbances of oxidant balance have been found to be involved in the activity of numerous harmful factors as well as in the pathogenesis of diverse illnesses. Selenium administration has proved to be effective against the toxicity of many agents and the side effects of drugs...
February 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
Wenfei Cai, Ting Hu, Amr M Bakry, Zhaomin Zheng, Yidong Xiao, Qilin Huang
The differences between ultrasonic and non-ultrasonic approaches in synthesizing Lignosus rhinocerotis polysaccharide-selenium nanoparticles (LRP-SeNPs) were compared in terms of size, morphology, stability and antioxidant activity by UV-VIS, FT-IR, X-ray diffraction (XRD), dynamic light scattering (DLS), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX) with high resolution TEM. Results indicated that the SeNPs were associated with the LRP macromolecules in a physical adsorption pattern without breaking chemical bonds, and the ultrasonic treatment reduced the size of SeNPs, narrowed the size distribution as well as improved the stability...
April 2018: Ultrasonics Sonochemistry
Sweety A Wadhwani, Utkarsha U Shedbalkar, Richa Singh, Balu A Chopade
Synthesis of nanoparticles is an enzymatic reduction process in microorganisms. In the present study, a protein, lignin peroxidase has been purified by DEAE-Cellulose anion exchange chromatography and Biogel P-150 gel filtration chromatography from the cell suspension of Acinetobacter sp. SW30 responsible for the synthesis of gold nanoparticles (AuNP) and selenium nanoparticles (SeNP). The purified fraction has a specific activity of 29.4U/mg/min with 959 fold purification. Native and SDS PAGE confirmed that purified lignin peroxidase is monomeric enzyme with 97...
April 2018: Enzyme and Microbial Technology
Jie Liu, Xiaolei Cai, Han-Chi Pan, Aishwarya Bandla, Chan Kim Chuan, Shaowei Wang, Nitish Thakor, Lun-De Liao, Bin Liu
As conjugated polymer nanoparticles (CPNs) have attracted growing interest as photoacoustic (PA) imaging contrast agents, revelation of the relationship between the molecular structure of conjugated polymers and PA property is highly in demand. Here, three donor-acceptor-structured conjugated polymer analogs are designed, where only a single heteroatom of acceptor units changes from oxygen to sulfur to selenium, allowing for systematic investigation of the molecular structure-PA property relationship. The absorption and PA spectra of these CPNs can be facilely tuned by changing the heteroatoms of the acceptor units...
February 7, 2018: Small
Xueyang Fang, Chang'e Li, Lan Zheng, Fang Yang, Tianfeng Chen
A combination of chemotherapy and photothermal therapy has emerged as a promising tactic for cancer therapy. However, the intricacy of accurate delivery and the ability to initiate drug release in specific tumor sites remains a challenging puzzle. Hence, to assure the chemotherapeutic drug and photothermal agent to be synchronously delivered to a tumor area to give play to their synergistic effect, the dual-target (RC-12 and PG-6 peptides) functionalized selenium nanoparticles loaded with both doxorubicin (DOX) and indocyanine green (ICG) were designed and successfully synthesized...
February 3, 2018: Chemistry, An Asian Journal
Sharoon Griffin, Muhammad Sarfraz, Steffen F Hartmann, Shashank Reddy Pinnapireddy, Muhammad Jawad Nasim, Udo Bakowsky, Cornelia M Keck, Claus Jacob
Many organic sulfur, selenium and tellurium compounds show considerable activity against microorganisms, including bacteria and fungi. This pronounced activity is often due to the specific, oxidizing redox behavior of the chalcogen-chalcogen bond present in such molecules. Interestingly, similar chalcogen-chalcogen motifs are also found in the elemental forms of these elements, and while those materials are insoluble in aqueous media, it has recently been possible to unlock their biological activities using naturally produced or homogenized suspensions of respective chalcogen nanoparticles...
January 27, 2018: Antioxidants (Basel, Switzerland)
David Medina Cruz, Gujie Mi, Thomas J Webster
Antimicrobial resistance is a global concern that affects more than 2 million people each year. Therefore, new approaches to kill bacteria are needed. One of the most promising methodologies may come from metallic nanoparticles, since bacteria may not develop a resistance to these nanostructures as they do for antibiotics. While metallic nanoparticle synthesis methods have been well studied, they are often accompanied by significant drawbacks such as cost, extreme processing conditions and toxic waste production since they use harsh chemicals such as corrosive agents (hydrazine) or strong acids (hydrochloride acid)...
January 22, 2018: Journal of Biomedical Materials Research. Part A
Punnida Nonsuwan, Songchan Puthong, Tanapat Palaga, Nongnuj Muangsin
We proudly present the first organic/inorganic hybrid pullulan/SeNPs hybrid microflower material obtained using a simple and bio-inspired strategy. The chemical structures of pullulan, folic acid decorated cationic pullulan (FA-CP) were designed for stabilizing selenium nanoparticles (SeNPs). SeNPs stabilized by FA-CP hybrid microflowers were observed after the addition of a cysteine hydrochloride solution into the solution mixture of Na2SeO3 and FA-CP. We suggested that the concentrations of cysteine and FA-CP were the key factors for the formation of flower-like structure...
March 15, 2018: Carbohydrate Polymers
Neeraj Kumar, Kishore Kumar Krishnani, Narendra Pratap Singh
Recent studies have demonstrated that selenium (Se) and selenium nanoparticles (Se-NPs) exhibited toxicity at a higher concentration. The lethal concentration of Se and Se-NPs was estimated as 5.29 and 3.97 mg/L at 96 h in Pangasius hypophthalmus. However, the effect of different definite concentration of Se (4.5, 5.0, 5.5, and 6.0 mg/L) and Se-NPs (2.5, 3.0, 3.5, and 4.0 mg/L) was decided for acute experiment. Selenium and Se-NPs alter the biochemical attributes such as anti-oxidative status [catalase (CAT), superoxide dismutase (SOD), and glutathione-S-transferase (GST) activities], neurotransmitter enzyme, cellular metabolic enzymes, stress marker, and histopathology of P...
January 13, 2018: Environmental Science and Pollution Research International
Yu Xia, Tiantian Xu, Changbing Wang, Yinghua Li, Zhengfang Lin, Mingqi Zhao, Bing Zhu
Human homeobox protein (Nanog) is highly expressed in most cancer cells and has gradually emerged as an excellent target in cancer therapy, owing to its regulation of cancer cell proliferation, metastasis and apoptosis. In this study, we prepared tumor-targeting functionalized selenium nanoparticles (RGDfC-SeNPs) to load chemotherapeutic doxorubicin (DOX) and Nanog siRNA. Herein, RGDfC peptide was used as a tumor-targeting moiety which could specifically bind to αvβ3 integrins overexpressed on various cancer cells...
2018: International Journal of Nanomedicine
Sharoon Griffin, Muhammad Irfan Masood, Muhammad Jawad Nasim, Muhammad Sarfraz, Azubuike Peter Ebokaiwe, Karl-Herbert Schäfer, Cornelia M Keck, Claus Jacob
During the last couple of decades, the rapidly advancing field of nanotechnology has produced a wide palette of nanomaterials, most of which are considered as "synthetic" and, among the wider public, are often met with a certain suspicion. Despite the technological sophistication behind many of these materials, "nano" does not always equate with "artificial". Indeed, nature itself is an excellent nanotechnologist. It provides us with a range of fine particles, from inorganic ash, soot, sulfur and mineral particles found in the air or in wells, to sulfur and selenium nanoparticles produced by many bacteria and yeasts...
December 29, 2017: Antioxidants (Basel, Switzerland)
Xuming Yang, Jiaolong Zhang, Zhenguang Wang, Hongkang Wang, Chunyi Zhi, Denis Y W Yu, Andrey L Rogach
Carbon-supported nickel selenide (Ni0.85 Se/C) hollow nanowires are prepared from carbon-coated selenium nanowires via a self-templating hydrothermal method, by first dissolving selenium in the Se/C nanowires in hydrazine, allowing it to diffuse out of the carbon layer, and then reacting with nickel ions into Ni0.85 Se nanoplates on the outer surface of the carbon. Ni0.85 Se/C hollow nanowires are employed as anode materials for sodium-ion batteries, and their electrochemical performance is evaluated via the cyclic voltammetry and electrochemical impedance spectroscopy combined with ex situ X-ray photoelectron spectroscopy and X-ray diffraction measurements...
December 27, 2017: Small
Jingpeng Yang, Jing Wang, Kun Yang, Miaomiao Liu, Yiman Qi, Tingjing Zhang, Mingtao Fan, Xinyuan Wei
Selenium (Se) is an essential trace element for human health and animal nutrition. The aim of this study was to evaluate the inhibitory activities of Se-enriched lactic acid bacteria (LAB), Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus thermophilus, against pathogenic Salmonella typhimurium, Escherichia coli, Staphylococcus aureus, and Listeria monocytogenes in vitro. The results indicated that the accumulation amount of Se by Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus thermophilus reached 12...
December 20, 2017: Journal of Dairy Science
Sheeana Gangadoo, Ivan Dinev, James Chapman, Robert J Hughes, Thi Thu Hao Van, Robert J Moore, Dragana Stanley
The poultry industry aims to improve productivity while maintaining the health and welfare of flocks. Pathogen control has been achieved through biosecurity, vaccinations and the use of antibiotics. However, the emergence of antibiotic resistance, in animal and human pathogens, has prompted researchers and chicken growers alike to seek alternative approaches. The use of new and emerging approaches to combat pathogen activity including nanotechnology, in particular, silver nanoparticles (NPs), has been found to not only eradicate pathogenic bacteria but also include issues of toxicity and bioaccumulation effects...
December 17, 2017: Applied Microbiology and Biotechnology
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