Curcumin as a natural compound in the synthesis of rigid polyurethane foams with enhanced mechanical, antibacterial and anti-ageing properties

Publication date: Available online 16 August 2019Source: Polymer TestingAuthor(s): Natalia Sienkiewicz, Sylwia CzłonkaAbstractThis paper presents the effect of natural compound (E,E)-1,7-bis(4-Hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (curcumin) on the antibacterial, anti-aging, mechanical and morphological properties of polyurethane (PU) rigid foams. Concentrations of 1 wt%, 2 wt% and 5 wt% of antibacterial compound was used, and the infection reduction capacity was evaluated for different types of bacteria (Escherichia coli (G-) and Staphylococcus aureus (G+). In order to determine all assumed properties the synthesized PU foams were characterized by analytical (Fourier Transform Infrared Spectroscopy, FTR), morphological (Scanning Electron Microscopy, SEM), bactericidal effects (Disc Diffusion Method), thermal characteristic (Thermogravimetric Analysis, TGA), mechanical techniques (three-point bending test and compressive test) and physical properties (apparent density, dimensional stability, contact angle, water uptake, color characteristics). Compared to the reference foam, compositions modified with 1 and 2 wt% of the curcumin showed greater compressive strength (increase of 10 and 7%, respectively), higher flexural strength (increase of 17 and 7%, respectively), less water uptake (decrease by 12 and 10%, respectively), as well as, better thermal properties. On the other hand, it has been shown, that in all cases, curcumin can be used as a natural anti-...
Source: Polymer Testing - Category: Chemistry Source Type: research

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Platelets are anucleate cells produced by megakaryocytes. In recent years, a robust body of literature supports the evolving role of platelets as key sentinel and effector cells in infectious diseases, especially critical in bridging hemostatic, inflammatory, and immune continuums. Upon intravascular pathogen invasion, platelets can directly sense viral, parasitic, and bacterial infections through pattern recognition receptors and integrin receptors or pathogen: immunoglobulin complexes through Fc and complement receptors—although our understanding of these interactions remains incomplete. Constantly scanning for are...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
utarowska Studies on the functionalization of materials used for the construction of filtering facepiece respirators (FFRs) relate to endowing fibers with biocidal properties. There is also a real need for reducing moisture content accumulating in such materials during FFR use, as it would lead to decreased microorganism survival. Thus, in our study, we propose the use of superabsorbent polymers (SAPs), together with a biocidal agent (biohalloysite), as additives in the manufacturing of polypropylene/polyester (PP/PET) multifunctional filtering material (MFM). The aim of this study was to evaluate the MFM for stability...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
Abstract Benign polymeric and textile based materials having multifaceted features such as antibacterial performance, hydrophobic property and photocatalytic activity are highly interesting from the both human health and environment observations. Herein, a cytocompatible polyester fiber composite incorporated via photocatalytic nano copper ferrite/myristic-lauric fatty acids coating with antibacterial and hydrophobic performances was prepared through one-pot facile fabrication route. X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, mapping images, Field-emission scanning electron microscope and Fo...
Source: Appl Human Sci - Category: Physiology Authors: Tags: Mater Sci Eng C Mater Biol Appl Source Type: research
Abstract Metal-organic framework (MOF) based graphene oxide (GO) recently merits of attention because of the relative correspondence of GO with metal ions and organic binding linkers. Furthermore, introducing the GO to the Co-MOF to make a new nanoporous hybrid have are improved the selectivity and stability of the Co-MOF. Here the graphene oxide/cobalt metal organic framework (GO/Co-MOF) was synthesized by a solvothermal process using cobalt salt and terephthalic acid and used for biocidal activity, against the growth of the Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria. X-ray di...
Source: Appl Human Sci - Category: Physiology Authors: Tags: Mater Sci Eng C Mater Biol Appl Source Type: research
Abstract A novel Z-scheme AgBr/Ag2MoO4@ZnO photocatalyst was fabricated via a hydrothermal process and in situ growth method. X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy were used to determine the structure of the photocatalyst. The results showed that the composites were tightly connected by the (101) lattice plane of ZnO, the (222) plane of Ag2MoO4 and the (200) lattice plane of AgBr. Because of the strong redox activity and good separability of photoelectrons and holes induced by the Z-scheme structure, the photodegradation rate for ciprofloxacin (CIP) solution wa...
Source: Biofouling - Category: Molecular Biology Authors: Tags: Biofouling Source Type: research
Publication date: Available online 6 September 2019Source: Journal of Microbiological MethodsAuthor(s): Tijo Cherian, Khursheed Ali, Saher Fatima, Quaiser Saquib, Sabiha M. Ansari, Hend A. Alwathnani, Abdulaziz A. Al-Khedhairy, Majed Al-Shaeri, Javed MusarratAbstractWe provide a novel one-step/one-pot bio-inspired method of synthesis for Myristica fragrans leaf ester (MFLE) capped‑zinc oxide nanoparticles (MFLE-ZnONPs). Antibacterial and antbiofilm efficacies of MFLE-ZnONPs were tested against the multi-drug resistant (MDR) Escherichia coli (E. coli-336), methicillin-resistant Staphylococcus aureus (MRSA-1) and methicill...
Source: Journal of Microbiological Methods - Category: Microbiology Source Type: research
Publication date: 1 January 2020Source: Materials Chemistry and Physics, Volume 239Author(s): Humaira Rani, Satarudra Prakash Singh, Thakur Prasad Yadav, Mohd Sajid Khan, Mohammad Israil Ansari, Akhilesh Kumar SinghAbstractA simple green chemistry route has been developed for the synthesis of copper (Cu) quantum dots (QDs) from copper sulfate using leaf extract of Mangifera indica (L.) with assessment of their catalytic, antibacterial and antioxidant activities. The impact of quantities of leaf extract, concentrations of copper sulfate, incubation temperature, pH and reaction time were investigated so as to attain regulati...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
Publication date: December 2019Source: Food Packaging and Shelf Life, Volume 22Author(s): Samira Dehghani, Seyed Hadi Peighambardoust, Seyed Jamaleddin Peighambardoust, Seyed Vali Hosseini, Joe M. RegensteinAbstractThis work dealt with antibacterial nanoparticles of silver (Ag), copper oxide (CuO), and zinc oxide (ZnO) and incorporated their combination at a reduced concentration to low-density polyethylene (LDPE) to prepare active packaging films. SEM (scanning electron microscopy) and SEM-energy dispersive X-ray (EDAX) observations showed a relatively homogenous distribution of nanoparticles on the fracture surfaces of t...
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research
Publication date: Available online 19 August 2019Source: Microbial PathogenesisAuthor(s): Baifen Song, Jianxin Zhang, Jinzhu Ma, Zhenyue Feng, Liquan Yu, Yongzhong Yu, Yudong CuiAbstractThe purpose of this investigation was to construct a recombinant Escherichia coli strain displaying the Staphylococcus aureus target of RNAIII activating protein (TRAP) on its surface, and to investigate the strain for its immunogenicity. The lpp'ompA and lpp'ompA-TRAP genes were fused by the overlap polymerase chain reaction and then ligated into expression plasmid pQE30 producing pLO and pLO-TRAP. These two recombinant plasmids were trans...
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
ConclusionThe microfractionation protocol developed in this study enabled time-efficient screening of many plants species, using a small quantity of sample material. In addition, microfractionation served as a guiding tool for identifying individual antimicrobial compounds. Through this process, flavonoids were isolated from Derris scandens, out of which dalpanithin and vicenin-3 showed activity in the low micromolar range. The high hit rate for in vitro antibacterial properties from this ethnopharmacologically guided sample collection gives credence to the Sri Lankan traditional herbal medicine as a source for drug discov...
Source: Journal of Ethnopharmacology - Category: Drugs & Pharmacology Source Type: research
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