A Simple Method of Simultaneously Endowing Paper or Fluff Pulp With Both High Softness or Appropriate Fluffing Properties and Antimicrobial Properties

2021 ◽  
Author(s):  
Yongjian Xu ◽  
Yun Shi ◽  
Xuyong Chen ◽  
Fenfen Liu ◽  
Wei Zhao
Keyword(s):  
Microbial Contamination ◽  
Antibacterial Property ◽  
Antimicrobial Properties ◽  
Living Standard ◽  
Simple Method ◽  
Burst Strength ◽  
Alkyl Chains ◽  
Sanitary Products ◽  
Potential Applications ◽  
New Compounds

Abstract As the living standard improve, disposable sanitary and living paper requires not only softness or easy to fluff in a dry state, but also good antibacterial property. In this study, a series of alkyl quaternary ammonium salts (AQAS), a kinds of antibacterial-debonding agents, were synthesized by using a two-step process. The SN2 nucleophilic substitution reaction was designed between triethanolamine and sulfoxide chloride, and followed subsequent quaternization by tertiaryamines with different long alkyl chains. The obtained products can be used as an antibacterial and softening/debonding agent for improving the performance of paper or fluff pulp. The results showed that these new compounds can endow antibacterial function and high softness to paper or control appropriate burst strength to fluff pulp board. These AQAS products can be not only used in daily disposable sanitary products, but also have potential applications in other products such as glass spacer paper, advanced household paper, or antibacterial tissue products to prevent microbial contamination.

A New Reactive Ketenaminal: Synthesis, Coupling Reaction, Tautomeric Study, Docking and Antimicrobial Evaluation of the Products

2020 ◽  
Vol 16 (6) ◽  
pp. 761-773
Author(s):  
Huda K. Mahmoud ◽  
Hanadi A. Katouah ◽  
Marwa F. Harras ◽  
Thoraya A. Farghaly
Keyword(s):  
Binding Site ◽  
Antimicrobial Agents ◽  
Coupling Reaction ◽  
Docking Study ◽  
Binding Mode ◽  
Binding Energies ◽  
Simple Method ◽  
Antimicrobial Evaluation ◽  
New Compounds ◽  
Active Methylene

Background: One of the most successful reagents used in the synthesis of the reactive enaminone is DMF-DMA, but it is very expensive with harmful effects on the human health and reacts with special compounds to generate the enaminone such as active methylene centers. Aim: In this article, we synthesized a new ketenaminal by simple method with inexpensive reagents (through desulfurization in diphenylether). Methods: Thus, a novel reactive ketenaminal (enaminone) was synthesized from the desulfurization of 2-((2-(4-chlorophenyl)-2-oxoethyl)thio)-5,7-bis(4-methoxyphenyl)pyrido[2,3-d]pyrimidin- 4(3H)-one with diphenylether. The starting keteneaminal was coupled with diazotized anilines via the known coupling conditions to give a new series of 2-(4-chlorophenyl)-1-(2-(arylhydrazono)-2- oxoethyl)-5,7-bis(4-methoxy-phenyl)pyrido[2,3-d]pyrimidin-4(1H)-ones. Results: The structures of the new compounds were elucidated based on their IR, 1H-NMR, 13CNMR, and Mass spectra. Moreover, the potency of these compounds as antimicrobial agents has been evaluated. The results showed that some of the products have high activity nearly equal to that of the used standard antibiotic. Additionally, the docking study was done to get the binding mode of the synthesized compounds with the binding site of the DHFR enzyme. The results of molecular docking of the synthesized arylhydrazono compounds are able to fit in DHFR binding site with binding energies ranging from -4.989 to -8.178 Kcal/mol. Conclusion: Our goal was achieved in this context by the synthesis of new ketenaminal from inexpensive reagents, which was utilized in the preparation of bioactive arylhydrazone derivatives.

scholarly journals Recent Findings in Azaphilone Pigments

2021 ◽  
Vol 7 (7) ◽  
pp. 541
Author(s):  
Lúcia P. S. Pimenta ◽  
Dhionne C. Gomes ◽  
Patrícia G. Cardoso ◽  
Jacqueline A. Takahashi
Keyword(s):  
Water Solubility ◽  
Biological Activities ◽  
Low Cost ◽  
Scale Up ◽  
Structural Diversity ◽  
Downstream Processing ◽  
Global Market ◽  
Yield Improvement ◽  
Potential Applications ◽  
New Compounds

Filamentous fungi are known to biosynthesize an extraordinary range of azaphilones pigments with structural diversity and advantages over vegetal-derived colored natural products such agile and simple cultivation in the lab, acceptance of low-cost substrates, speed yield improvement, and ease of downstream processing. Modern genetic engineering allows industrial production, providing pigments with higher thermostability, water-solubility, and promising bioactivities combined with ecological functions. This review, covering the literature from 2020 onwards, focuses on the state-of-the-art of azaphilone dyes, the global market scenario, new compounds isolated in the period with respective biological activities, and biosynthetic pathways. Furthermore, we discussed the innovations of azaphilone cultivation and extraction techniques, as well as in yield improvement and scale-up. Potential applications in the food, cosmetic, pharmaceutical, and textile industries were also explored.

Synthesis and QCM gas-sensing properties of 3,4-dialkoxyphenyl tosylamino-substituted phthalocyanines

2020 ◽  
Vol 24 (05n07) ◽  
pp. 830-839 ◽  
Author(s):  
Mika Harbeck ◽  
Zafer Şen ◽  
Dilek D. Erbahar ◽  
Esranur Fidan Çelik ◽  
Gülay Gümüş ◽  
...  
Keyword(s):  
Metal Ion ◽  
Gas Sensing ◽  
Metal Salt ◽  
Chemical Warfare Agent ◽  
Sensing Properties ◽  
Alkyl Chains ◽  
H Nmr ◽  
Gas Sensing Properties ◽  
Ft Ir ◽  
New Compounds

Octa-substituted metallophthalocyanines [M = Ni(II), Zn(II), Co(II), and Cu(II)] carrying 3,4-dialkoxyphenyl tosylamino groups at the peripheral positions have been synthesized from 1,2-dicyano-4,5-bis[(3,4-dialkoxyphenyl-tosylamino)methyl]benzene in the presence of the corresponding anhydrous metal salt. Next to the metal ion center, the length of the alkyl chains in the dialkoxyphenyl moiety ([Formula: see text], 5, 6, and 12) was varied. In total, sixteen soluble phthalocyanines have been characterized by elemental analysis, FT-IR and [Formula: see text]H-NMR spectroscopy as well as mass spectrometry. Furthermore, the gas sensing properties of these new compounds have been studied using quartz crystal microbalance transducers. The sensing properties are described on the basis of sensor responses to nine different test analytes comprising volatile organic compounds, toxic gases, and chemical warfare agent simulants. The influence of the metal ion center and substituents on sensor selectivity and sensitivity is discussed. The compounds show good performance in the gas-sensing experiments with diverse responses to the analytes. Phthalocyanine species with pronounced selectivity for polar analytes, hydrocarbons or amines have been identified among the set of sensors with the help of multivariate data exploration methods. The results reveal that quite a high diversity in terms of selectivity is introduced through the minute variations to the phthalocyanine structure.

Continuum Modeling and Analysis of the Frictional Interaction Between a CNT and a Substrate During Dragging

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
George G. Adams ◽  
Palaniappan Nagappan ◽  
Nicol E. McGruer
Keyword(s):  
Steady State ◽  
Partial Slip ◽  
Simple Method ◽  
Modeling And Analysis ◽  
Aspect Ratios ◽  
Atomic Force ◽  
Frictional Interaction ◽  
Potential Applications ◽  
The Relationship

A simple method to determine the frictional interaction between a carbon nanotube (CNT) and a substrate is analyzed for feasibility. In this technique an atomic force microscope (AFM) tip is used to drag a CNT along a substrate. Then the deformed shape of the CNT can be viewed either with the AFM or in a scanning electron microscope. An analysis of the steady-state deformed shape allows the determination of the frictional interactions, which occurred during dragging. It is important to quantify these interactions in a variety of potential applications of nanotechnology. In one such example, a CNT based nanoswitch consists of a CNT bridging over a trench. Actuation of the CNT causes it to stretch and can lead to partial slip at the interface. This slip causes hysteresis, which has been observed in the mechanical actuation of a CNT bridge. In this paper continuum level modeling of the frictional interaction is used to determine the relationship between the steady-state deformed shape of the CNT and the frictional interaction, which occurred between the CNT and substrate during dragging. The model and analysis indicate that this method should be feasible for CNTs with aspect ratios approximately in the 100–250 range.

scholarly journals Comprehensive Evaluation of the Antibacterial and Antifungal Activities of Carlina acaulis L. Essential Oil and Its Nanoemulsion

Antibiotics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1451
Author(s):  
Antonio Rosato ◽  
Alexia Barbarossa ◽  
Ahmed M. Mustafa ◽  
Giulia Bonacucina ◽  
Diego Romano Perinelli ◽  
...  
Keyword(s):  
Essential Oil ◽  
Comprehensive Evaluation ◽  
Antimicrobial Properties ◽  
Homogenization Method ◽  
Bacterial Strains ◽  
Antifungal Activities ◽  
Fungal Strains ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
New Compounds

Plants are considered to be an excellent source of new compounds with antibiotic activity. Carlina acaulis L. is a medicinal plant whose essential oil (EO) is mainly characterized by the polyacetylene carlina oxide, which has antimicrobial properties. The aim of this study was to evaluate the antimicrobial and antifungal activities of C. acaulis EO, carlina oxide, and nanoemulsion (NE) containing the EO. The EO was obtained through plant roots hydrodistillation, and carlina oxide was purified from it through silica gel column chromatography. The NE containing C. acaulis EO was prepared with the high-pressure homogenization method, and the minimum inhibitory concentration (MIC) was determined against several bacterial and fungal strains for all the C. acaulis-derived products. The latter resulted in activity active versus all the screened Gram-positive bacterial strains and also on all the fungal strains with low MIC values. For yeast, the EO and carlina oxide showed good MIC values. The EO-NE demonstrated a better activity than the pure EO on all the tested bacterial and fungal strains. The results suggest that C. acaulis-derived products could be potential candidates for the development of natural antibacterial and antifungal agents.

scholarly journals Hydrothermal synthesis of carbon nanodots from wine cork and biocompatible fluorescent probe

2021 ◽  
Author(s):  
Ngo Khoa Quang ◽  
Nguyen Ngoc Hieu ◽  
Vo Van Quoc Bao ◽  
Vo Thi Phuoc ◽  
Le Xuan Diem Ngoc ◽  
...  
Keyword(s):  
Stem Cells ◽  
Hydrothermal Synthesis ◽  
Low Cost ◽  
Average Diameter ◽  
Optical Measurements ◽  
Carbon Nanodots ◽  
Structural And Optical Properties ◽  
Simple Method ◽  
Fluorescent Image ◽  
Potential Applications

We presented a low-cost and simple method to synthesize carbon nanodots (CDs) from waste wine cork using hydrothermal synthesis.  The structural and optical properties of the CDs are characterized by TEM, FTIR, Raman, UV-Vis absorption, and photoluminescence (PL) spectra. The analysis results indicated the average diameter of CDs ⁓ 6.2 ± 2.7 nm. Optical measurements showed the phenomenon of excitation-dependent PL and the formation of functional groups on the surface of the particles. CDs with a quantum yield of 1.54% was calculated using quinine sulfate as reference. Furthermore, a probe of wine cork-derived CDs in bioimaging has been successfully applied in living mesenchymal stem cells (MSCs). After treatment with CDs, MSCs exhibited fluorescence including green, yellow, and red colors under the excitation wavelengths in the range 330–385 nm, 450–480 nm, and 510–550 nm, respectively. The achievement demonstrated potential applications of fluorescent CDs in the field of the fluorescent image.

scholarly journals Formation of Bifunctional Octasilsesquioxanes via Silylative Coupling and Cross-Metathesis Reaction

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3966
Author(s):  
Małgorzata Bołt ◽  
Patrycja Żak ◽  
Beata Dudziec ◽  
Anna Schulmann ◽  
Bogdan Marciniec
Keyword(s):  
Functional Materials ◽  
Metathesis Reaction ◽  
One Pot ◽  
Intermediate Products ◽  
Design And Synthesis ◽  
Cross Metathesis ◽  
Synthetic Procedure ◽  
Wide Range ◽  
Potential Applications ◽  
New Compounds

Bifunctional silsesquioxanes create an attractive group of compounds with a wide range of potential applications, and recently they have gained much interest. They are known to be obtained mainly via hydrosilylation, but we disclose novel synthetic protocols based on different but complementary reactions, i.e., cross-metathesis (CM) and silylative coupling (SC). A series of cubic T8 type silsesquioxane derivatives with a broad scope of styryl substituents were synthesized in a one-pot procedure and characterized by spectroscopic and spectrometric methods. All of the new compounds can be obtained in a one-pot manner, which has an attractive impact on the synthetic procedure, as it is economic in terms of the isolation of intermediate products. Additionally, the methodology disclosed here enables the (E)-stereoselective introduction of styrenes derivative to the cubic T8 type core. The presented compounds can be interesting precursors for a further functionalization that may significantly increase the possibility of their application in the design and synthesis of new functional materials.

Synthesis, Characterization and Evaluation of Antimicrobial Properties of (R)-(-)-4-Phenyl-2 Oxazolidinone Based Azetidinones

2018 ◽  
Vol 16 (2) ◽  
pp. 104-113 ◽  
Author(s):  
Shyamal Baruah ◽  
Amrit Puzari ◽  
Farhana Sultana ◽  
Jayanta Barman
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Acetic Acid ◽  
Bacillus Subtilis ◽  
Antibacterial Property ◽  
Antimicrobial Properties ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
E Coli ◽  
Aromatic Imines

Introduction: A series of (R)-(-)-4-Phenyl-2 oxazolidinone based azetidinones (4a-i) were synthesized from the reaction of (2-Oxo-4-phenyl-oxazolidin-3-yl) acetic acid with aromatic imines (3a-i) in the presence of Thionyl chloride and Triethylamine as a base. Methods: The transformation proceeds through the formation of acid chloride to ketene which finally forms the azetidinones through [2+2] cycloaddition with aromatic imines. Products obtained were screened to evaluate their antibacterial activity with respect to known bacteria like Escherichia Coli (E. Coli) and Bacillus subtilis. Results and Conclusion: In most of the cases, azetidinones were found to exhibit superior antimicrobial properties than oxazolidinones. They were found to be a good inhibitor of gram-positive and gramnegative bacteria. Enhancement of antibacterial property can be attributed to the presence of azetidinone ring and hydrophobic alkyl side chain in the scaffolds.

scholarly journals Synthesis and Spectral Studies of Copper (II) and Manganese (II) Complexes Using 2-Hydroxybenzyl-(pyridine-2-carbo)Iminohydrazone and 2-Furyl(pyridine-2-carbo)Iminohydrazone: Evaluation of Their Magnetic, and Antimicrobial Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jagvir Singh ◽  
Anu ◽  
NetraPal Singh
Keyword(s):  
Antimicrobial Properties ◽  
Coordination Complexes ◽  
Mass Spectrometric ◽  
Spectral Studies ◽  
Pyridine Moiety ◽  
Antimicrobial Studies ◽  
Mononuclear Complexes ◽  
Physicochemical Studies ◽  
New Compounds ◽  
C Nmr

Three new coordination complexes [Cu(HPBH)2]Cl2(1), [Cu(FPFH)2]Cl2(2), and [Mn(HPBH)2] Cl2(3) (where HPBH=2-Hydroxybenzyl(pyridine-2-carbo)iminohydrazone, and FPFH=2-furyl(pyridine-2-carbo)iminohydrazone) have been synthesized using two different tridentate hydrazones ligand. The ligands were prepared by condensation of Pyridine-2-acetylchloride, 2-Hydroxybenzaldehyde and Furan-2-carbaldehyde with hydrazine, respectively, in spite of varying the carbonyl functionality attached to the pyridine moiety present in the hydrazones ligand. In both the Schiff bases, we obtained three mononuclear complexes 1, 2, and 3 which were clearly characterized from physicochemical studies. Spectroscopic investigations like1H and13C NMR, mass spectrometric, FTIR, and UV/Vis have been carried out for new compounds. For complexes 2 cyclic voltammetry, magnetic and EPR properties have also been recorded. Antimicrobial studies have also been performed for these compounds with different antimicrobial species.

Sign in / Sign up

Export Citation Format

Share Document