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https://www.readbyqxmd.com/read/29334586/a-non-heme-iron-photocatalyst-for-light-driven-aerobic-oxidation-of-methanol
#1
Wesley Richard Browne, Juan Chen, Apparao Draksharapu, Maja Gruden, Stepan Stepanovic
The non-heme (L)FeIII and (L)FeIII-O-FeIII(L) complexes (L = 1,1-di(pyridin-2-yl)-N,N-bis(pyridin-2-ylmethyl)ethan-1-amine) undergoes reduction under irradiation to the FeII state with concomitant oxidation of methanol to methanal, without the need for a secondary photosensitizer. Spectroscopic and Density Functional Theory (DFT) studies support a mechanism in which irradiation results in charge transfer excitation of a FeIII--O-FeIII complex to generate [(L)FeIV=O]2+ (observed transiently during irradiation in acetonitrile), and an equivalent of LFeII...
January 15, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29334455/modulating-the-molybdenum-coordination-sphere-of-escherichia-coli-trimethylamine-n-oxide-reductase
#2
Paul Kaufmann, Benjamin R Duffus, Biljana Mitrova, Chantal Iobbi-Nivol, Christian Teutloff, Manfred Nimtz, Lothar Jänsch, Ulla Wollenberger, Silke Leimkühler
The well-studied enterobacterium Escherichia coli present in the human gut is able to reduce TMAO to trimethylamine (TMA) during anaerobic respiration. The TMAO reductase TorA is a monomeric, bis-molybdopterin guanine dinucleotide (bis-MGD) cofactor-containing enzyme belonging to the dimethylsulfoxide (DMSO) reductase family of molybdoenzymes. We report on a system for the in vitro reconstitution of TorA with molybdenum cofactors (Moco) from different sources. Higher TMAO reductase activities for TorA were obtained when using Moco-sources containing a sulfido ligand at the molybdenum atom...
January 15, 2018: Biochemistry
https://www.readbyqxmd.com/read/29334389/effect-of-coordination-geometry-on-the-magnetic-properties-of-a-series-of-ln2-and-ln4-hydroxo-clusters
#3
Amaleswari Rasamsetty, Chinmoy Das, E Carolina Sañudo, Maheswaran Shanmugam, Viswanathan Baskar
A series of three isostructural tetranuclear complexes with the general molecular formula [Ln4(μ3-OH)4(L)4(μ2-piv)4(MeOH)4] (Ln = Gd 1, Dy 2 and Ho 3; LH = [1,3-bis(o-methoxyphenyl)-propane-1,3-dione]) were isolated and unambiguously characterized by single crystal XRD. Under similar reaction conditions, simply changing the co-ligand from pivalate to 2,6-bis(hydroxymethyl)-p-cresol (LH'3) led to the isolation of dinuclear Ln(iii) complexes with the general molecular formula [Ln2(L)4(μ2-LH'2)2]·4DMF (Ln = Gd 4, Dy 5 and Ho 6)...
January 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29334109/a-multifunctional-supramolecular-hydrogel-preparation-properties-and-molecular-assembly
#4
Lin Wang, Xuefeng Shi, Yaqian Wu, Jian Zhang, Yuejun Zhu, Jinben Wang
A novel supramolecular hydrogel was designed and constructed by molecular self-assembly of a cationic gemini surfactant, 1,3-bis(N,N-dimethyl-N-cetylammonium)-2-propylacrylate dibromide (AGC16), and an anionic aromatic compound, trisodium 1,3,6-naphthalenetrisulfonate (NTS). Owing to its unique structure, the hydrogel (abbreviated as AGC16/NTS) has the potential to be used as a multifunctional drug delivery system. The structure and properties of AGC16/NTS were characterized by rheological measurements, differential scanning calorimetry, variable-temperature 1H nuclear magnetic resonance, ultraviolet-visible spectroscopy, variable-temperature fluorescence emission spectroscopy, cryogenic scanning electron microscopy, transmission electron microscopy and X-ray diffraction methods...
January 15, 2018: Soft Matter
https://www.readbyqxmd.com/read/29333391/analysis-of-antioxidant-and-anti-inflammatory-activities-of-solvent-fractions-from-rhynchosia-nulubilis-cultivated-with-ganoderma-lucidum-mycelium
#5
Mihye Park, Meera Kim
In this study, the crude ethanol Rhynchosia nulubilis cultivated with Ganoderma lucidum mycelium (RNGM) extract was solvent fractionated with organic solvents such as n-hexane, chloroform, ethyl acetate, and water. The anticancer activities, anti-inflammatory activity total polyphenols, total flavonoids, isoflavones, and β-glucan of the solvent fractions of RNGM were studied. The ethyl acetate fraction showed the highest 2,2-diphenyl-1-picrylhydrazyl scavenging activity of 76.60% at 800 μg/mL. The ethyl acetate fraction also showed higher antioxidant activity in 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) and ferric reducing ability of plasma assays compared to the other fractions...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333390/physicochemical-and-consumer-acceptance-of-tofu-supplemented-with-licorice-powder
#6
Jun Ho Lee, Han San Jung
To develop functionally and nutritionally improved tofu, the effects of partial (0.2~0.8%) replacement with licorice powder (LP) on the quality characteristics of tofu were investigated. The pH and turbidity values decreased upon addition of increasing amounts of LP (P<0.05). The yield of LP-supplemented tofu was higher than that of the control tofu, and it increased as the concentration of LP increased (P<0.05). Substituting 0.6% and above of LP significantly hardened the texture of tofu (P<0.05) while control and 0...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333389/influence-of-cooking-methods-on-bioactive-compound-content-and-antioxidant-activity-of-brussels-sprouts
#7
Eun-Sun Hwang
The effects of different cooking methods on total bioactive compound content were determined, and in vitro antioxidant activity in 80% ethanolic extracts of Brussels sprouts was evaluated by spectrophotometric methods. Compared to uncooked, steamed, and microwaved Brussels sprouts extracted with 80% ethanol contained higher amounts of total polyphenols. Uncooked Brussels sprouts contained the highest amounts of total flavonoids. Microwaved Brussels sprouts contained the highest amounts of total carotenoids (0...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333384/antioxidant-and-cytoprotective-activities-of-enzymatic-extracts-from-rhizoid-of-laminaria-japonica
#8
Jae-Young Je, Soo Yeon Park, Chang-Bum Ahn
Rhizoid of Laminaria japonica was hydrolyzed with proteases and carbohydrases to obtain antioxidant materials. Oxygen radical absorbance capacity (ORAC) of the enzymatic extracts was evaluated and the Protamex extract (PE) exhibited the highest ORAC value. PE also potently scavenged 2,2-diphenyl-1-picrylhydrazyl radical, 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic) acid cation radical, and hydrogen peroxide (H2O2) and had good reducing power. PE inhibited hydroxyl radical-induced DNA scission by measuring the conversion of supercoiled pBR322 plasmid DNA to the open circular form...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333382/antioxidant-and-quinone-reductase-activity-of-soyasaponins-in-hepa1c1c7-mouse-hepatocarcinoma-cells
#9
Eun-Sun Hwang
Saponins have been reported to possess several health beneficial activities including hypocholesterolemic, immune-stimulatory, and anticarcinogenic. The objectives of this study were to determine if soysaponins are radical scavengers and inducers of quinone reductase (QR) activity in Hepa1c1c7 murine hepatoma cell line. The antioxidant capacity of soyasaponin was evaluated using the 1,1'-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging methods...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29333351/understanding-the-effect-of-the-dianhydride-structure-on-the-properties-of-semiaromatic-polyimides-containing-a-biobased-fatty-diamine
#10
Arijana Susa, Johan Bijleveld, Marianella Hernandez Santana, Santiago J Garcia
In this work we report the effect of the hard block dianhydride structure on the overall properties of partially biobased semiaromatic polyimides. For the study, four polyimides were synthesized using aliphatic fatty dimer diamine (DD1) as the soft block and four different commercially available aromatic dianhydrides as the hard block: 4,4'-(4,4'-isopropylidenediphenoxy) bis(phthalic anhydride) (BPADA), 4,4'-oxidiphthalic anhydride (ODPA), 4,4'-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA), and 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA)...
January 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29332828/uplc-ms-ms-analysis-for-antioxidant-components-of-lycii-fructus-based-on-spectrum-effect-relationship
#11
Xian-Fei Zhang, Juan Chen, Jun-Li Yang, Yan-Ping Shi
Lycii Fructus is widely cultivated in the Northwest China. It is well-known for its antiaging effect in traditional Chinese medicines (TCMs), but the effective components are not clear. In this work, the ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) was used to study the antioxidant components of Lycii Fructus through analyzing the spectrum-effect relationship, and the positive correlation components with antioxidant activity were partially identified. The extractums of Lycii Fructus were adsorbed with macroporous resin, and then eluted with water and 30%, 60%, 90% ethanol in turn...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332595/new-bis-pyrazolones-as-potential-leads-for-ros-inhibition-environment-friendly-green-synthesis-structural-characterization-and-in-vitro-studies
#12
Sahar Yousuf, Khalid Mohammed Khan, Uzma Salar, Almas Jabeen, Shakil Ahmed, Munira Taj Muhammad, Aisha Faheem, Shahnaz Perveen
BACKGROUND: Pyrazolones have identified as significant antioxidant agents and many marketed and clinically prescribed NSAIDs have pyrazolone ring as main scaffold. METHOD: Keeping in consideration the antioxidant potential of pyrazolone scaffold, new bis-pyrazolones 3-30 were synthesized by a green and enviroment friendly reaction route, in which two equivalents of 1-(4-chlorophenyl)-3-methyl-1H-pyrazol-5-ol were treated with one equivalent of benzaldehyde derivatives without any catalyst...
January 12, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29332430/effect-of-creatine-phosphate-sodium-on-bispectral-index-and-recovery-quality-during-the-general-anaesthesia-emergence-period-in-elderly-patients-a-randomized-double-blind-placebo-controlled-trial
#13
Wei Wang, Wan-You Yu, Jie Lv, Lian-Hua Chen, Zhong Li
Objective To evaluate the effect of creatine phosphate sodium on bispectral index (BIS) and recovery quality during the general anaesthesia emergence period in elderly patients. Methods This randomized, double-blind, placebo-controlled study enrolled patients undergoing transabdominal cholecystectomy under general anaesthesia. Patients were randomly assigned to receive either creatine phosphate sodium (1.0 g/100 ml 0.9% saline; group P) or 100 ml 0.9% saline (group C) over 30 minutes during surgical incision...
January 1, 2018: Journal of International Medical Research
https://www.readbyqxmd.com/read/29331819/new-strategy-for-determination-of-anthocyanins-polyphenols-and-antioxidant-capacity-of-brassica-oleracea-liquid-extract-using-infrared-spectroscopies-and-multivariate-regression
#14
Isadora R N de Oliveira, Jussara V Roque, Mariza P Maia, Paulo C Stringheta, Reinaldo F Teófilo
A new method was developed to determine the antioxidant properties of red cabbage extract (Brassica oleracea) by mid (MID) and near (NIR) infrared spectroscopies and partial least squares (PLS) regression. A 70% (v/v) ethanolic extract of red cabbage was concentrated to 9° Brix and further diluted (12 to 100%) in water. The dilutions were used as external standards for the building of PLS models. For the first time, this strategy was applied for building multivariate regression models. Reference analyses and spectral data were obtained from diluted extracts...
January 4, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29330691/bis-guanylhydrazones-as-efficient-anti-candida-compounds-through-dna-interaction
#15
Jelena Lazić, Vladimir Ajdačić, Sandra Vojnovic, Mario Zlatović, Marina Pekmezovic, Selene Mogavero, Igor Opsenica, Jasmina Nikodinovic-Runic
Candida spp. are leading causes of opportunistic mycoses, including life-threatening hospital-borne infections, and novel antifungals, preferably aiming targets that have not been used before, are constantly needed. Hydrazone- and guanidine-containing molecules have shown a wide range of biological activities, including recently described excellent antifungal properties. In this study, four bis-guanylhydrazone derivatives (BG1-4) were generated following a previously developed synthetic route. Anti-Candida (two C...
January 12, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29329886/solid-phase-extraction-of-chlorophenols-in-seawater-using-a-magnetic-ionic-liquid-molecularly-imprinted-polymer-with-incorporated-silicon-dioxide-as-a-sorbent
#16
Wanwan Ma, Kyung Ho Row
A type of magnetic ionic liquid based molecularly imprinted polymer coated on SiO2 (Fe3O4@SiO2@IL-MIPs) was prepared with 1-vinyl-3-ethylimidazole ionic liquid as functional monomer, and 1,4-butane-3,3'-bis-1-ethylimidazole ionic liquid as cross linker, 4-Chlorophenol as template was successfully applied as a selective adsorbent for selective extraction of 5 chlorophenols in seawater samples by using the magnetic solid-phase extraction (MSPE) method. 11 types of Fe3O4@SiO2@IL-MIPs were synthesized and investigated for their different compositions of functional monomer (such as [C2min][Br], [C2min][BF4], [C2min][PF6], acrylamide, methacrylic acid and 4-vinyl pyridine) and cross-linker (such as [C4min2][Br], [C4min2][BF4], [C4min2][PF6], divinylbenzene, and ethylene glycol dimethacrylate), respectively...
January 6, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29329229/chemical-composition-and-evaluation-of-the-biological-properties-of-the-essential-oil-of-the-dietary-phytochemical-lippia-citriodora
#17
Eleni Fitsiou, Gregoria Mitropoulou, Katerina Spyridopoulou, Manolis Vamvakias, Haido Bardouki, Alex Galanis, Katerina Chlichlia, Yiannis Kourkoutas, Mihalis Ι Panayiotidis, Aglaia Pappa
The aim of the study was to characterize the chemical composition and biological properties of the essential oil from the plant Lippia citriodora grown in Greece. The essential oil volatiles were analyzed by gas chromatography-mass spectrometry GC-MS indicating citral as the major component. Τhe antimicrobial properties were assayed using the disk diffusion method and the minimum inhibitory and non-inhibitory concentration values were determined. Listeria monocytogenes, Staphylococcus epidermidis, Staphylococcus aureus, Saccharomyces cerevisiae, and Aspergillus niger were sensitive to Lippia citriodora oil, but not Escherichia coli, Salmonella Enteritidis, Salmonella typhimurium, and Pseudomonas fragi...
January 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29329097/sources-and-transformation-pathways-for-dichlorodiphenyltrichloroethane-ddt-and-metabolites-in-soils-from-northwest-fujian-china
#18
Huanfang Huang, Yuan Zhang, Wei Chen, Wenwen Chen, Dave A Yuen, Yang Ding, Yingjie Chen, Yao Mao, Shihua Qi
Dicofol (2,2,2-trichloro-1,1-bis-(p-chlorophenyl)ethanol) found in the environment is not only a miticide originated from commercial use, but also a metabolite of dichlorodiphenyltrichloroethane (DDT), which is often overlooked. To verify the sources and transformation pathways of DDT and related metabolites in soils, we measured p,p'-(dicofol + DBP) (sum of p,p'-dicofol and 4,4'-dichlorobenzophenone), DDT and six metabolites in soils from Northwest Fujian, China. The ratios of 1,1,1-trichloro-2-(o-chlorophenyl)-2-(p-chlorophenyl)ethane (o,p'-DDT)/1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane (p,p'-DDT) and the mass balance demonstrated that p,p'-(dicofol + DBP) predominantly originated from p,p'-DDT transformation rather than from actual dicofol application...
January 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29328671/dimethylcalcium
#19
Benjamin M Wolf, Christoph Stuhl, Cäcilia Maichle-Mössmer, Reiner Anwander
The salt metathesis reaction between homoleptic calcium bis(trimethylsilyl)amide [Ca{N(SiMe3)2}2]2 and "halide-free" methyllithium MeLi allowed for the isolation of X-ray amorphous dimethylcalcium [CaMe2]n in good yields and purities. The formation of [CaMe2]n was proven by microanalysis and NMR/FTIR spectroscopic methods as well as a series of derivatization reactions. Although slowly decomposing thf, [CaMe2]n could be crystallized from chilled thf solutions as the heptametallic adduct [(thf)10Ca7Me14]. Reaction of [CaMe2]n with CaI2 in thf led to the dimeric complex [(thf)3Ca(Me)(I)]2 whereas in tetrahydropyran (thp) the trinuclear complex [(thp)5Ca3(Me)5(I)] was obtained, both representing the first crystallographically characterized heavy-Grignard compounds with methyl groups as the hydrocarbyl ligand...
January 12, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29328668/bis-dinitrogen-cobalt-i-complexes-with-nhc-ligation-synthesis-characterization-and-their-dinitrogen-functionalization-reactions-affording-side-on-bound-diazene-complexes
#20
Yafei Gao, Guangyu Li, Liang Deng
Late transition-metal-based catalysts are widely used in N2 fixation reactions, but the reactivity of late transition-metal N2 complexes, besides of iron N2 complexes, remained poorly understood as their N2 complexes were thought labile and hard to be functionalized. By employing a monodentate N-heterocyclic carbene (NHC), 1,3-dicyclohexyl-imidazol-2-ylidene (ICy) as ligand, the cobalt(0)- and cobalt(-1)-N2 complexes, [(ICy)3Co(N2)] (1) and [(ICy)2Co(N2)2M]n (M = K, 2a; Rb, 2b; Cs, 2c), respectively, were synthesized from the stepwise reduction of (ICy)3CoCl by the corresponding alkaline metals under a N2 atmosphere...
January 12, 2018: Journal of the American Chemical Society
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