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Isolation and characterization of compounds

Ben Ajmia Wafa, Mohamed Makni, Sonda Ammar, Lamia Khannous, Amal Ben Hassana, Mohamed Bouaziz, Nour Eddine Es-Safi, Radhouane Gdoura
Punica granatum L. is widely recognized for its potency against a broad spectrum of bacterial pathogens. The purpose of this study was to explore the inhibitory and the bactericidal activities of Punica granatum against Salmonella strains. The effect of extracts obtained from different parts (peels, seeds, juice and flowers) of pomegranate and using different solvents against Salmonella enterica serovars Kentucky and Enteritidis isolated from chicken meat was thus investigated. Salmonella strains were identified with the standard API-20E system and confirmed by real time PCR...
October 11, 2016: International Journal of Food Microbiology
Ellen Games, Marina Guerreiro, Fernanda R Santana, Nathalia M Pinheiro, Emerson A de Oliveira, Fernanda D T Q S Lopes, Clarice R Olivo, Iolanda F L C Tibério, Mílton A Martins, João Henrique G Lago, Carla M Prado
BACKGROUND: Chronic obstructive pulmonary disease (COPD) is characterized by irreversible airflow obstruction and inflammation. Natural products, such as monoterpenes, displayed anti-inflammatory and anti-oxidant activities and can be used as a source of new compounds to COPD treatment. Our aim was to evaluate, in an elastase-induced pulmonary emphysema in mice, the effects of and underlying mechanisms of three related natural monoterpenes (p-cymene, carvacrol and thymol) isolated from essential oil from leaves Lippia sidoides Cham...
October 20, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Akio Hayashi, Hiromi Ota, Xavier López, Norihito Hiyoshi, Nao Tsunoji, Tsuneji Sano, Masahiro Sadakane
Dipotassium cation (K(+))-encapsulated Preyssler-type phosphotungstate, [P5W30O110K2](13-), was prepared by heating monobismuth (Bi(3+))-encapsulated Preyssler-type phosphotungstate, [P5W30O110Bi(H2O)](12-), in acetate buffer in the presence of an excess amount of potassium cations. Characterization of the isolated potassium salt, K13[P5W30O110K2] (1a), and its acid form, H13[P5W30O110K2] (1b), by single crystal X-ray structure analysis, (31)P and (183)W nuclear magnetic resonance (NMR), Fourier transform infrared (FT-IR) spectroscopy, cyclic voltammetry (CV), high-resolution electrospray ionization mass spectroscopy (HR-ESI-MS), and elemental analysis revealed that two potassium cations are encapsulated in the Preyssler-type phosphotungstate molecule with formal D5h symmetry, which is the first example of a Preyssler-type compound with two encapsulated cations...
October 24, 2016: Inorganic Chemistry
Boris Pinchuk, Thorsten von Drathen, Viktoria Opel, Christian Peifer
Dabrafenib (Tafinlar) was approved in 2013 by the FDA as a selective single agent treatment for patients with BRAF(V600E) mutation-positive advanced melanoma. One year later, a combination of dabrafenib and trametinib was used for treatment of BRAF(V600E/K) mutant metastatic melanoma. In the present study, we report on hitherto not described photosensitivity of dabrafenib both in organic and aqueous media. The half-lives for dabrafenib degradation were determined. Moreover, we revealed photoinduced chemical conversion of dabrafenib to its planar fluorescent derivative dabrafenib_photo 2...
October 13, 2016: ACS Medicinal Chemistry Letters
Jonathan Boyd, Alice Han
Deguelin is one of four major naturally occurring rotenoids isolated from root extracts and is best recognized as a NADH: ubiquinone oxidoreductase (complex I) inhibitor, resulting in significant alterations in mitochondrial function. Deguelin has also been implicated as a regulator of apoptosis through signaling pathways, such as the (PI3K)/Akt pathway, as well as an initiator of cell cycle arrest. Consequently, this compound has accrued great interest as a potential chemopreventive and chemotherapeutic. Additionally, deguelin exposure has been linked to Parkinson's disease (PD)...
2016: Advances in Experimental Medicine and Biology
Guillaume Gillot, Jean-Luc Jany, Elisabeth Poirier, Marie-Bernadette Maillard, Stella Debaets, Anne Thierry, Emmanuel Coton, Monika Coton
Penicillium roqueforti is used as a ripening culture for blue cheeses and largely contributes to their organoleptic quality and typical characteristics. Different types of blue cheeses are manufactured and consumed worldwide and have distinct aspects, textures, flavors and colors. These features are well accepted to be due to the different manufacturing methods but also to the specific P. roqueforti strains used. Indeed, inoculated P. roqueforti strains, via their proteolytic and lipolytic activities, have an effect on both blue cheese texture and flavor...
October 4, 2016: International Journal of Food Microbiology
Aura Falco, Yusibeska Ramos, Esther Franco, Alegría Guzmán, Howard Takiff
BACKGROUND: Klebsiella pneumoniae is a bacterial pathogen that has developed resistance to multiple antibiotics and is a major cause of nosocomial infections worldwide. Carbapenemase-producing Klebsiella pneumoniae have been isolated in many hospitals in Venezuela, but they have not been well-studied. The aim of this study was to characterize carbapenem-resistant Klebsiella pneumoniae isolates from the pediatric service of a hospital located in Anzoategui State, in the eastern part of Venezuela...
October 22, 2016: BMC Infectious Diseases
Florian Graef, Branko Vukosavljevic, Jean-Philippe Michel, Marius Wirth, Oliver Ries, Chiara De Rossi, Maike Windbergs, Véronique Rosilio, Christian Ducho, Sarah Gordon, Claus-Michael Lehr
Gram-negative bacteria possess a unique and complex cell envelope, composed of an inner and outer membrane separated by an intermediate cell wall-containing periplasm. This tripartite structure acts intrinsically as a significant biological barrier, often limiting the permeation of anti-infectives, and so preventing such drugs from reaching their target. Furthermore, identification of the specific permeation-limiting envelope component proves difficult in the case of many anti-infectives, due to the challenges associated with isolation of individual cell envelope structures in bacterial culture...
October 18, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
Yanyan Zheng, Li Zhu, Lulu Fan, Wenna Zhao, Jianlong Wang, Xianxiao Hao, Yunhui Zhu, Xiufang Hu, Yaofeng Yuan, Jingwei Shao, Wenfeng Wang
Emodin, a natural anthraquinone derivative isolated from Rheum palmatum L., has been demonstrated to exhibit good anti-cancer effect. In this study, a series of novel quaternary ammonium salts of emodin, anthraquinone and anthrone were synthesized and their anticancer activities were tested in vitro. The effects of emodin quaternary ammonium salts on cell viability, apoptosis, intracellular ROS, and mitochondrial membrane potential were investigated in A375, BGC-823, HepG2 and HELF cells. The results demonstrated that compound 4a induced morphological changes and decreased cell viability...
October 7, 2016: European Journal of Medicinal Chemistry
Xiao-Feng Xiong, Hang Zhang, Christina R Underwood, Kasper Harpsøe, Thomas J Gardella, Mie F Wöldike, Michael Mannstadt, David E Gloriam, Hans Bräuner-Osborne, Kristian Strømgaard
G proteins are key mediators of G protein-coupled receptor signalling, which facilitates a plethora of important physiological processes. The cyclic depsipeptides YM-254890 and FR900359 are the only known specific inhibitors of the Gq subfamily of G proteins; however, no synthetic route has been reported previously for these complex natural products and they are not easily isolated from natural sources. Here we report the first total synthesis of YM-254890 and FR900359, as well as of two known analogues, YM-385780 and YM-385781...
November 2016: Nature Chemistry
Michael G Sommer, Yvonne Rechkemmer, Lisa Suntrup, Stephan Hohloch, Margarethe van der Meer, Joris van Slageren, Biprajit Sarkar
The azido ligand is widely used in coordination chemistry both as a ligand and as a metal-bound reactant. Its role as a bridge for magnetic exchange coupling has attracted a lot of attention in polynuclear metal complexes. However, only a very limited number of complexes are known in which a single azide anion, particularly in the μ1,1-mode, is the only unsupported connection between two metal centers. We present here a series of copper(ii)-azido complexes with amine anchored, triazole-based tripodal ligands containing varying substituents...
October 21, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Li Wang, Lei Liu, Dong Liu, Zhe Yin, Jiao Feng, Defu Zhang, Haihong Fang, Yefeng Qiu, Weijun Chen, Ruisheng Yang, Jinglin Wang, Yunzhi Fa, Dongsheng Zhou
The purpose of this study was to characterize mechanisms of plasmid-mediated antimicrobial resistance in Shigella boydii. S. boydii strain 2246 with resistance to ciprofloxacin, ceftriaxone and azithromycin was isolated from a human case of watery diarrhea in a Chinese public hospital. Resistance in strain 2246 to ceftriaxone and azithromycin was attributable to the presence of blaCTX-M-14, and erm(B) and mph(A), respectively, which were co-located on a multidrug-resistant (MDR) plasmid p2246-CTXM. p2246-CTXM represented a novel IncFII-type MDR plasmid with a very complex chimera structure...
2016: Frontiers in Microbiology
Ilhem Guesmi-Mzoughi, Antonio Archidona-Yuste, Carolina Cantalapiedra-Navarrete, Hajer Regaieg, Najet Horrigue-Raouani, Juan E Palomares-Rius, Pablo Castillo
Spiral nematode species of the genus Rotylenchus have been reported on olive (Olea europaea L.) in several Mediterranean countries (Castillo et al., 2010; Ali et al., 2014). Nematological surveys for plant-parasitic nematodes on olive trees were carried out in Tunisia between 2013 and 2014, and two nematode species of Rotylenchus were collected from the rhizosphere of olive cv. Chemlali in several localities of Tunisia (Tables 1,2 [Table: see text] [Table: see text] ). Twenty-two soil samples of 3 to 4 kg were collected with a shovel from the upper 50 cm of soil from arbitrarily chosen olive trees...
September 2016: Journal of Nematology
Xin-Long Wang, Feng-Jiao Zhou, Man Dou, Yong-Ming Yan, Shu-Mei Wang, Lei Di, Yong-Xian Cheng
Ganoderma mushrooms are of great nutritious and medicinal values. This study was designed to characterize compounds from the fruiting bodies of Ganoderma cochlear and investigate their protective effects against kidney disorders. Six novel meroterpenoids cochlearoids F-K (1-6) were isolated by utilizing phytochemical approaches. Their structures were identified on the basis of extensive spectroscopic data and calculation methods. Biological evaluation shows that compounds 1-4 and 6 exhibit potent inhibitory activity on fibronectin overproduction in TGF-β1-induced HKC-8 cells...
October 7, 2016: Bioorganic & Medicinal Chemistry Letters
Divya Arora, Nisha Sharma, Venugopal Singamaneni, Vishal Sharma, Manoj Kushwaha, Vidushi Abrol, Santosh Guru, Sonia Sharma, Ajai Prakash Gupta, Shashi Bhushan, Sundeep Jaglan, Prasoon Gupta
BACKGROUND: The genus Xylaria has been reported as a rich source of biologically active secondary metabolites. In the present study, an endophytic fungus Xylaria psidii has been isolated from the leaf sample of Aegle marmelos (L.) Corr., characterized on the basis of its morphological features and sequence data for the ITS region (KU291350) of the nuclear ribosomal DNA. Biological screening of ethyl acetate extract of Xylaria psidii displayed a potential therapeutic effect on pancreatic cancer cells...
November 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Simona Arena, Giovanni Renzone, Chiara D'Ambrosio, Anna Maria Salzano, Andrea Scaloni
Heating of milk and dairy products is done using various technological processes with the aim of preserving microbiological safety and extending shelf-life. These treatments result in chemical modifications in milk proteins, mainly generated as a result of the Maillard reaction. Recently, different bottom-up proteomic methods have been applied to characterize the nature of these structural changes and the modified amino acids in model protein systems and/or isolated components from thermally-treated milk samples...
March 15, 2017: Food Chemistry
Reyna Del C Lara-Severino, Miguel A Camacho-López, Edgar Casanova-González, Leobardo M Gómez-Oliván, Ángel H Sandoval-Trujillo, Keila Isaac-Olivé, Ninfa Ramírez-Durán
The use of native strains of microorganisms from soils is an excellent option for bioremediation. To our knowledge, until now there has been no other group working on the isolation of Actinobacteria from contaminated soils in Mexico. In this study, samples of soils close to areas with oil activity in the State of Veracruz, Mexico, were inoculated for the isolation of Actinobacteria. The strains isolated were characterized morphologically, and the concentrations of NaCl and pH were determined for optimal growth...
March 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
Sonia Fieulaine, Rodolphe Alves de Sousa, Laure Maigre, Karim Hamiche, Mickael Alimi, Jean-Michel Bolla, Abbass Taleb, Alexis Denis, Jean-Marie Pagès, Isabelle Artaud, Thierry Meinnel, Carmela Giglione
Peptide deformylase (PDF) is considered an excellent target to develop antibiotics. We have performed an extensive characterization of a new PDF from the pathogen Streptococcus agalactiae, showing properties similar to other known PDFs. S. agalactiae PDF could be used as PDF prototype as it allowed to get complete sets of 3-dimensional, biophysical and kinetic data with virtually any inhibitor compound. Structure-activity relationship analysis with this single reference system allowed us to reveal distinct binding modes for different PDF inhibitors and the key role of a hydrogen bond in potentiating the interaction between ligand and target...
October 20, 2016: Scientific Reports
Nathan D Crosby, John J Janik, Warren M Grill
Kilohertz-frequency spinal cord stimulation (KHF-SCS) is a potential paresthesia-free treatment for chronic pain. However, the effects of KHF-SCS on spinal dorsal column (DC) axons and its mechanisms of action remain unknown. The objectives of this study were to quantify activation and conduction block of DC axons by KHF-SCS across a range of kHz frequencies (1, 5, 10, or 20 kHz) and waveforms (biphasic pulses or sinusoids). Custom platinum electrodes delivered SCS to the T10/T11 DCs of anesthetized male Sprague-Dawley rats...
October 19, 2016: Journal of Neurophysiology
Qian-Qian Meng, Xing-Rong Peng, Shuang-Yang Lu, Luo-Sheng Wan, Xia Wang, Jin-Run Dong, Rui Chu, Lin Zhou, Xiao-Nian Li, Ming-Hua Qiu
Three new limonoid-type triterpenoids, namely toonasins A-C (1-3) with a rare lactam E ring, along with six known compounds (4-9) were isolated from the barks of Toona sinensis. The structures of new compounds were elucidated by interpretation of spectroscopic data, and the relative configuration of compound 1 was further characterized by X-ray crystallographic analyses. The isolated compounds were evaluated for their cytotoxic activities against five human tumor cell lines (HL-60, SMMC-7721, A-549, MCF-7 and SW480), and compounds 3 and 5 showed weak cytotoxicities...
October 18, 2016: Natural Products and Bioprospecting
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