Day: October 17, 2022

Zayed, Naiera; Boon, Nico; Bernaerts, Kristel; Chatzigiannidou, Ioanna; Van Holm, Wannes; Verspecht, Tim; Teughels, Wim published the artcile< Differences in chlorhexidine mouthrinses formulations influence the quantitative and qualitative changes in in-vitro oral biofilms>, Recommanded Product: 1-Hexadecylpyridin-1-ium chloride, the main research area is antimicrobial chlorhexidine mouthrinse oral biofilm; antimicrobials; chlorhexidine; mouthrinses; oral biofilms.

Chlorhexidine mouthrinses are marketed in different formulations. This study aimed at investigating qual. and quant. changes in in-vitro multispecies oral biofilms, induced by different chlorhexidine-containing mouthrinses. Earlier studies comparing chlorhexidine mouthrinses are either clin. studies or in-vitro studies assessing the antimicrobial efficacy of the mouthrinses. However, no clear investigations are available regarding ecol. impact of different chlorhexidine formulations on in-vitro multispecies oral biofilms after rinsing with different chlorhexidine formulations. Nine com. available chlorhexidine mouthrinses were selected. Multispecies oral communities (14 species) were grown for 48 h in a Biostat-B Twin bioreactor. After that, they were used to develop biofilms on the surface of hydroxyapatite disks in 24-well pates for 48 h. Biofilms were then rinsed once or multiple times with the corresponding mouthrinse. Biofilms were collected before starting the rinsing experiment and every 24 h for 3 days and vitality quant. PCR was performed. The experiment was repeated 3 independent times on 3 different days and the results were analyzed using a linear mixed model. The mouthrinses provoked different effects in terms of change in total viable bacterial load (VBL), ecol., and community structure of the multispecies biofilms. There was no relation between chlorhexidine concentrations, presence, or absence of cetylpyridinium chloride and/or alc., and the observed effects. Some tested chlorhexidine mouthrinses (MC, HG, HH, and HI) strongly lowered the total VBL (≈1007 Geq/mL), but disrupted biofilm symbiosis (≥40% of the biofilms communities are pathobionts). On the other hand, other tested chlorhexidine mouthrinses (MD, ME, and HF) had limited impact on total VBL (≥ 1010 Geq/mL), but improved the biofilm ecol. and community structure (≤ 10% of the biofilms communities are pathobionts). Not all chlorhexidine mouthrinses have the same effect on oral biofilms. Their effect seems to be strongly product dependent and vary according to their compositions and formulations.

Journal of Periodontal Research published new progress about Antimicrobial agents. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Recommanded Product: 1-Hexadecylpyridin-1-ium chloride.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Guanglong; Xiao, Keya; Shi, Man; Shuai, Jing; Xu, Zhiping; Li, Zhong; Cheng, Jiagao published the artcile< Study on 4-Oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-d]pyrimidine Derivatives: Design, Synthesis, Insecticidal Assay and Binding Mode Studies>, HPLC of Formula: 3731-53-1, the main research area is oxotetrahydro pyrazolopyrimidine preparation insecticide docking SAR; GABA receptor; fipronil; insecticidal activity; phenylpyrazole; scaffold hopping.

A series of 4-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-d]pyrimidine derivatives were designed and synthesized based on the fipronil low energy conformation by scaffold hopping strategy. Physicochem. properties calculation, insecticidal assay and binding mode studies were also performed. It was found that the target compounds displayed lower insecticidal activities than fipronil. The differences in binding modes between these compounds and fipronil may be the major reason for reduced insecticidal activities.

Chemistry & Biodiversity published new progress about Amines Role: RCT (Reactant), RACT (Reactant or Reagent). 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, HPLC of Formula: 3731-53-1.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Sasiadek, Wojciech; Bryndal, Iwona; Lis, Tadeusz; Wandas, Maria; Hanuza, Jerzy published the artcile< Synthesis and physicochemical properties of the methyl-nitro-pyridine-disulfide: X-ray, NMR, electron absorption and emission, IR and Raman studies and quantum chemical calculations>, Computed Properties of 19346-45-3, the main research area is methyl nitro pyridine disulfide preparation crystal structure IR NMR.

The methyl-nitro-pyridine-disulfide derivative [2,2′-disulfanodiylbis(6-metyl-3-nitropyridine)] was synthesized and characterized by means of structural and spectroscopic measurements. On the basis of X-ray diffraction studies, it was found that the studied compound crystallizes in the centrosym. monoclinic space group P21/n (Z = 2). The disulfide C-S-S-C bridge links two identical fragments formed by pyridine rings substituted with Me and nitro groups. Such a structure was confirmed by 1H and 13C NMR studies as well as IR, Raman, UV-VIS and emission spectra. Quantum chem. DFT calculations were applied in the anal. of the obtained results. The vibrational characteristics were reported and dynamical properties of this moiety were discussed. A full set of the normal modes characteristic for the disulfide bridge was identified and assigned to the resp. IR and Raman bands. The results of structural and spectroscopic studies were used to find the dependence between the conformation of the Φ-S-S-Φ system and its optic properties. The exptl. electron and emission spectra were analyzed in terms of the calculated singlet and triplet states that allowed assigning the unique spectral pattern originating from the electrons of the C-S-S-C bridge system.

Journal of Molecular Structure published new progress about Aromatic compounds, disulfides Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 19346-45-3 belongs to class pyridine-derivatives, and the molecular formula is C6H5FN2O2, Computed Properties of 19346-45-3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Parada, Giovanny A.; Goldsmith, Zachary K.; Kolmar, Scott; Pettersson Rimgard, Belinda; Mercado, Brandon Q.; Hammarstroem, Leif; Hammes-Schiffer, Sharon; Mayer, James M. published the artcile< Concerted proton-electron transfer reactions in the Marcus inverted region>, Reference of 396092-82-3, the main research area is concerted proton electron transfer reaction Marcus inverted region.

One of the most counterintuitive features of electron transfer kinetics is the inverted region. As Marcus theory predicts and experiments have borne out, electron transfer slows down once the driving force for it becomes especially favorable. Parada et al. now offer evidence for such inverted behavior in proton-coupled electron transfer. Specifically, they examined a series of compounds with phenol bridging anthracene (electron acceptor) and pyridine (proton acceptor) derivatives Time-resolved spectroscopy and accompanying theory revealed slower rates at higher driving forces in the back reaction that follows light-induced intramol. proton and electron transfer.

Science (Washington, DC, United States) published new progress about Charge separation. 396092-82-3 belongs to class pyridine-derivatives, and the molecular formula is C7H9BrN2, Reference of 396092-82-3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Iwata, Takahiro; Hirose, Hisaaki; Sakamoto, Kentarou; Hirai, Yusuke; Arafiles, Jan Vincent V.; Akishiba, Misao; Imanishi, Miki; Futaki, Shiroh published the artcile< Liquid Droplet Formation and Facile Cytosolic Translocation of IgG in the Presence of Attenuated Cationic Amphiphilic Lytic Peptides>, Formula: C10H8N2S2, the main research area is cervical cancer Fc binding ACAL peptide L17E IgG; antibodies; intracellular delivery; liquid droplet; liquid-liquid phase separation (LLPS); peptides.

Fc region binding peptide conjugated with attenuated cationic amphiphilic lytic peptide L17E trimer [FcB(L17E)3] was designed for IgG (IgG) delivery into cells. Particle-like liquid droplets were generated by mixing Alexa Fluor 488 labeled IgG (Alexa488-IgG) with FcB(L17E)3. Droplet contact with the cellular membrane led to spontaneous influx and distribution of Alexa488-IgG throughout cells in serum containing medium. Involvement of cellular machinery accompanied by actin polymerization and membrane ruffling was suggested for the translocation. Alexa488-IgG neg. charges were crucial in liquid droplet formation with pos. charged FcB(L17E)3. Binding of IgG to FcB(L17E)3 may not be necessary. Successful intracellular delivery of Alexa Fluor 594-labeled anti-nuclear pore complex antibody and anti-mCherry-nanobody tagged with supernegatively charged green fluorescence protein allowed binding to cellular targets in the presence of FcB(L17E)3.

Angewandte Chemie, International Edition published new progress about Blood serum. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Formula: C10H8N2S2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Dai, Q.; Wang, H.; Wang, Y.; Xiao, M.; Jin, H.; Li, M.; Xia, T. published the artcile< Enhancing the sensory attributes and antioxidant properties of snus by mixing it with tea>, Safety of 3-(Methoxycarbonyl)pyridine, the main research area is tea beverage snus antioxidant sensory property.

In the present work, we investigated the chem. and volatile compositions of three tea-containing snus samples, after which their acceptability on the aromatic and taste coordination was evaluated by a professional panel. Results showed that the tea-containing snus samples exhibited better acceptability on the aroma and taste coordination profiles. Dahongpao tea (DT)-containing snus (DT-snus) exhibited the best acceptability of aromatic coordination, whereas the most favorable taste coordination was exhibited by Keemun black tea (KBT)-containing snus (KBT-snus). The antioxidant activity determined by the DPPH and ABTS assays revealed that Lu’an Guapian tea (LGT)-containing snus (LGT-snus) exhibited the highest free-radical scavenging ability. LGT-snus was also found to have the highest content of total polyphenols, amino acids, and caffeine. The highest levels of total flavonoids and soluble sugars were found in DT-snus and KBT-snus, resp. There were 88, 68, and 74 volatiles found in DT-snus, LGT-snus, and KBT-snus, resp., among which, nitrogenous compounds constituted the major category. High levels of nicotine, megastigmatrienone, neophytadiene, nicotyrine, and cotinine, which are the major volatiles in snus, were detected in the tea-containing snus samples. The mixing of tea introduced the flavor profiles of the volatiles present in the original tea into the tea-containing snus samples. Benzaldehyde, β-ionone, hexanoic acid, 3-(Z)-hexenyl ester, pyrazines, and nerolidol from LGT; furfural, benzeneethanol, nerolidol, linalool, and cedrol from DT; and nonanal, geraniol, cis-jasmone, benzenemethanol, and Me salicylate from KBT were found in high concentrations in the corresponding tea-containing snus samples.

International Food Research Journal published new progress about Acids Role: ANT (Analyte), FFD (Food or Feed Use), PRP (Properties), ANST (Analytical Study), BIOL (Biological Study), USES (Uses). 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Safety of 3-(Methoxycarbonyl)pyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Huang, Qi; Zard, Samir Z. published the artcile< Modular route to azaindanes>, Electric Literature of 131747-55-2, the main research area is xanthate ester radical cyclization; azaindane preparation.

A convergent radical based route to azaindanes, e.g., I, is described, relying on the degenerative addition transfer of various substituted S-(pyridylmethyl)-O-Et dithiocarbonates (xanthates) to functional alkenes followed by radical cyclization onto the pyridine ring activated by protonation with trifluoroacetic acid. In one case, a richly decorated cyclohepta[b]pyridine could be assembled swiftly by allowing the first adduct to N-phenylmaleimide to undergo addition to N-allylphthalimide prior to cyclization.

Organic Letters published new progress about Heterocyclic compounds Role: SPN (Synthetic Preparation), PREP (Preparation) (azaindanes). 131747-55-2 belongs to class pyridine-derivatives, and the molecular formula is C6H6FNO, Electric Literature of 131747-55-2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Tiecco, M.; Testaferri, L.; Tingoli, M.; Chianelli, D.; Montanucci, M. published the artcile< A convenient synthesis of bipyridines by nickel-phosphine complex-mediated homo coupling of halopyridines>, Category: pyridine-derivatives, the main research area is coupling halopyridine; bipyridine methoxy; pyridine halo coupling; nickel phosphine complex coupling catalyst.

Coupling of 2-bromopyridine in DMF in the presence of Ni(PPh3)4, prepared in situ from NiCl2, PPh3, and Zn, gave 68% 2,2′-bipyridine. Among the 10 other compounds similarly prepared were: 4,4′-biquinoline and 2,2′-dimethoxy-3,3′-bipyridine.

Synthesis published new progress about Coupling reaction. 13472-84-9 belongs to class pyridine-derivatives, and the molecular formula is C6H6ClNO, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Obradors, Carla; List, Benjamin published the artcile< Azine Activation via Silylium Catalysis>, Synthetic Route of 3796-23-4, the main research area is heteroarene silyl ketene acetal silylium phosphoramidimidate catalyst regioselective addition; silyl alkyl heteroarene preparation oxidation; alkyl heteroarene preparation.

A direct, catalytic and selective functionalization of azines via silylium activation was described. The catalyst design enabled mild conditions and a remarkable functional group tolerance in a one-pot setup.

Journal of the American Chemical Society published new progress about Acetals, ketene, silyl Role: RCT (Reactant), RACT (Reactant or Reagent). 3796-23-4 belongs to class pyridine-derivatives, and the molecular formula is C6H4F3N, Synthetic Route of 3796-23-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Tan, Yee Seng; Tiekink, Edward R. T. published the artcile< Crystal structure of catena-poly{(μ2-N1,N2-bis[(pyridin-4-yl)methyl]ethanediamide-κ2N:N′)-bis(O,O′-di-isopropyldithiophosphato-κ1S)zinc(II)} - acetonitrile (1/1), C26H42N4O6P2S4Zn[n.8901]C2H3N>, Related Products of 3731-53-1, the main research area is crystal structure catenapolypyridinmethylethanediamideisopropyldithiophosphatoacetonitrile.

C28H45N5O6P2S4Zn, monoclinic, P21/c (number 14), a = 7.73670(10) Å, b = 21.56370(10) Å, c = 23.1184(2) Å, β = 99.121(1)°, V = 3808.12(6) Å3, Z = 4, Rgt(F) = 0.0210, wRref(F2) = 0.0580, T = 100(2) K. CCDC number: 1959644. The Zn[S2P(O-iPr)2]2precursor was prepared in high yield from the in situ reaction of Zn(NO3)2·6 H2O (Alfa Aesar; 14.87 g, 0.05 mol), iPrOH (Merck; 16.05 mL, 0.21 mol), P2S5(Sigma-Aldrich; 11.11 g, 0.05 mol) and 50% weight/weight NaOH solution (Merck; 8.80 mL, 0.11 mol). N, N-Bis(pyridin-4-ylmethyl) ethanediamide (4LH2) was prepared in high yield from the 2:1 reaction (reflux) of 4-picolylamine (Aldrich; 2.03 mL, 0.02 mol) and di-Et oxalate (Aldrich; 1.36 mL, 0.01 mol) in ethanol solution (Merck; 5 mL). The title compound was obtained by mixing a suspension of Zn[S2P(O-iPr)2]2(0.50 g, 1.02 mmol) and N,N-bis(pyridin-4-ylmethyl)ethanediamide (0.28 g, 1.04 mmol) in DMF (Merck; 5 mL), followed by stirring for 30 min at 373 K. The solution was filtered, the filtrate taken in acetonitrile (Merck; 1 mL) and transferred to a vial for crystallization Yellow crystals formed after one day.

Zeitschrift fuer Kristallographie – New Crystal Structures published new progress about Crystal structure. 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Related Products of 3731-53-1.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem