Synthesis, characterization, thermal stability, reactivity, and antimicrobial properties of some novel lanthanide(III) complexes of 2-(N-salicylideneamino)-3-carboxyethyl-4,5,6,7-tetrahydrobenzo[b]thiophene

2006 ◽  
Vol 32 (8) ◽  
pp. 600-609 ◽  
Author(s):  
K. Mohanan ◽  
S. N. Devi
Keyword(s):  
Thermal Stability ◽  
Antimicrobial Properties

scholarly journals Antimicrobial Properties of Chitosan-Alumina/f-MWCNT Nanocomposites

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Monaheng Masheane ◽  
Lebea Nthunya ◽  
Soraya Malinga ◽  
Edward Nxumalo ◽  
Tobias Barnard ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polymer Matrix ◽  
Antimicrobial Properties ◽  
Inversion Method ◽  
Bacterial Strains ◽  
Multiwalled Carbon ◽  
Simple Phase ◽  
Phase Inversion Method ◽  
Thermal Stability Of ◽  
Sem Analyses

Antimicrobial chitosan-alumina/functionalized-multiwalled carbon nanotube (f-MWCNT) nanocomposites were prepared by a simple phase inversion method. Scanning electron microscopy (SEM) analyses showed the change in the internal morphology of the composites and energy dispersive spectroscopy (EDS) confirmed the presence of alumina and f-MWCNTs in the chitosan polymer matrix. Fourier transform infrared (FTIR) spectroscopy showed the appearance of new functional groups from both alumina and f-MWCNTs, and thermogravimetric analysis (TGA) revealed that the addition of alumina and f-MWCNTs improved the thermal stability of the chitosan polymer. The presence of alumina and f-MWCNTs in the polymer matrix was found to improve the thermal stability and reduced the solubility of chitosan polymer. The prepared chitosan-alumina/f-MWCNT nanocomposites showed inhibition of twelve strains of bacterial strains that were tested. Thus, the nanocomposites show a potential for use as a biocide in water treatment for the removal of bacteria at different environmental conditions.

scholarly journals Synthesis, Characterization and Their Antimicrobial Activities of Boron Oxide/Poly(Acrylic Acid) Nanocomposites: Thermal and Antimicrobial Properties

2018 ◽  
Vol 18 (1) ◽  
pp. 28-36 ◽  
Author(s):  
P. T. Beyli ◽  
M. Doğan ◽  
Z. Gündüz ◽  
M. Alkan ◽  
Y. Turhan
Keyword(s):  
Thermal Stability ◽  
Acrylic Acid ◽  
Polymer Matrix ◽  
Boron Oxide ◽  
Antimicrobial Properties ◽  
Antimicrobial Activities ◽  
Dilution Method ◽  
Solution Intercalation ◽  
Thermal Stability Of ◽  
Poly Acrylic Acid

AbstractBoron oxide (B2O3)/Poly(acrylic acid) (PAA) nanocomposites were synthesized by solution intercalation method, and characterized by Fourier transform infrared spectroscopy (FTIR-ATR), transmission electron microscopy (TEM), X-ray diffraction and thermogravimetric analysis (DTA/TG). The effect of boron oxide amount on the thermal stability of nanocomposites was investigated. Moreover, the antimicrobial activities of them were also determined by the serial dilution method against E. coli and S. aureus. XRD analysis showed that boron oxide was homogenously dispersed in polymer matrix; FTIR-ATR that there was interaction between PAA and boron oxide; and TEM that boron oxide particles had spherical structure, and dispersed in nano size in polymer matrix; DTA/TG that the thermal stability of polymers increased with the adding of boron oxide into polymer matrix, and changed the decomposition mechanism of PAA. B2O3/PAA nanocomposites exhibited higher decomposition temperature. The decomposition mechanisms of PAA and its nanocomposites occurred through three decomposition steps; dehydration, decarboxylation and chain scission. B2O3/PAA nanocomposites showed greater antimicrobial activity with increasing B2O3 amount.

scholarly journals Characterization of Carboxymethyl Cellulose Films Incorporated with Chinese Fir Essential Oil and Their Application to Quality Improvement of Shine Muscat Grape

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 97
Author(s):  
Luyu Mei ◽  
Liuxin Shi ◽  
Xiuli Song ◽  
Su Liu ◽  
Qiang Cheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Essential Oil ◽  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Water Solubility ◽  
Composite Films ◽  
Antimicrobial Properties ◽  
Chinese Fir ◽  
Volatile Components ◽  
Scanning Calorimetry

In this study, carboxymethyl cellulose (CMC) films containing 1%, 2%, and 3% Chinese fir essential oil (CFEO) were prepared. The mechanical, optical, physical, microstructural, thermal stability and antimicrobial properties of the films were studied. A traditional steam distillation method was applied for CFEO extraction, in which 35 volatile components were identified. The research results showed that the CMC film mixed with 1% CFEO had the highest tensile strength (TS) and elongation at break (EB), whereas the flexibility was decreased under higher concentrations of CFEO. However, the film’s degree of transparency under controlled humidity did not decrease with an increase in CFEO concentration; thus, the sensory evaluation was not adversely effect. Furthermore, the thickness and the water solubility (WS) of film increased after the addition of CFEO. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) results indicated that the thermal stability of the CMC-CFEO films improved. Moreover, the composite films showed excellent inhibitory effects toward Gram-positive bacterias and Penicillium citrinum. The treatments of grapes with CMC + 1% CFEO resulted in the best properties during storage. CMC-CFEO film can be a candidate for food packaging due to its excellent performances.

scholarly journals Effect of Silver Nanopowder on Mechanical, Thermal and Antimicrobial Properties of Kenaf/HDPE Composites

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3928
Author(s):  
Vikneswari Sanmuham ◽  
Mohamed Thariq Hameed Sultan ◽  
A. M. Radzi ◽  
Ahmad Adlie Shamsuri ◽  
Ain Umaira Md Shah ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Antimicrobial Activity ◽  
Antimicrobial Properties ◽  
Tensile Modulus ◽  
Inhibitory Effects ◽  
Elongation At Break ◽  
Improved Stability ◽  
Mechanical Tensile ◽  
Internal Mixer ◽  
Tga And Dsc

This study aims to investigate the effect of AgNPs on the mechanical, thermal and antimicrobial activity of kenaf/HDPE composites. AgNP material was prepared at different contents, from 0, 2, 4, 6, 8 to 10 wt%, by an internal mixer and hot compression at a temperature of 150 °C. Mechanical (tensile, modulus and elongation at break), thermal (TGA and DSC) and antimicrobial tests were performed to analyze behavior and inhibitory effects. The obtained results indicate that the effect of AgNP content displays improved tensile and modulus properties, as well as thermal and antimicrobial properties. The highest tensile stress is 5.07 MPa and was obtained at 10wt, TGA showed 10 wt% and had improved thermal stability and DSC showed improved stability with increased AgNP content. The findings of this study show the potential of incorporating AgNP concentrations as a secondary substitute to improve the performance in terms of mechanical, thermal and antimicrobial properties without treatment. The addition of AgNP content in polymer composite can be used as a secondary filler to improve the properties.

scholarly journals Biodegradable Rice Starch/Carboxymethyl Chitosan Films with Added Propolis Extract for Potential Use as Active Food Packaging

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 954 ◽  
Author(s):  
Rungsiri Suriyatem ◽  
Rafael Auras ◽  
Chitsiri Rachtanapun ◽  
Pornchai Rachtanapun
Keyword(s):  
Thermal Stability ◽  
Food Packaging ◽  
Radical Scavenging ◽  
Antimicrobial Properties ◽  
Carboxymethyl Chitosan ◽  
Rice Starch ◽  
Propolis Extract ◽  
Gram Positive Bacteria ◽  
Active Food Packaging ◽  
Potential Use

Active films from rice starch/carboxymethyl chitosan (RS/CMCh) incorporated with propolis extract (ppl) were developed and characterized. The effect of the ppl content (0–10% w/w based on RS/CMCh) on the developed films’ properties were determined by measuring the optical, mechanical, thermal, swelling, barrier, antimicrobial, and antioxidant attributes. The thermal stability and biodegradability of the films were also investigated. As the ppl content increased, free radical scavenging and a* and b* color values increased, whereas luminosity (L*) and swellability of the films decreased. The active films with 5–10% ppl possessed antimicrobial ability against Gram-positive bacteria (Staphylococcus aureus and Bacillus cereus). The active film with 10% ppl displayed increased flexibility and thermal stability, without a change in oxygen permeability. The results indicated that incorporation of ppl into RS/CMCh film could enhance the films’ antioxidant and antimicrobial properties.

Antimicrobial properties and thermal stability of polycarbonate modified with 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids

2013 ◽  
Vol 131 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sergiy Rogalsky ◽  
Kateryna Fatyeyeva ◽  
Lyudmila Lyoshina ◽  
Oksana Tarasyuk ◽  
Olga Bulko ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Antimicrobial Properties ◽  
Thermal Stability Of

Study of the Encapsulations of the Eugenol in β-Cyclodextrin in Low Concentrations Conditions

2017 ◽  
Vol 899 ◽  
pp. 54-59 ◽  
Author(s):  
Raquel Piletti ◽  
A.M. Bugiereck ◽  
A. Pereira ◽  
J.M.M. Mello ◽  
F. Dalcanton ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Controlled Release ◽  
Environmental Factors ◽  
Essential Oils ◽  
Oxidative Stability ◽  
Thermal Processing ◽  
Food Industry ◽  
Antimicrobial Properties ◽  
Thermal And Oxidative Stability ◽  
Low Concentrations

Essential oils, their antimicrobial properties due to arouse interest in the food industry for use as antimicrobial additives. However, due to their low thermal and oxidative stability its application is limited. Among the essential oils, eugenol is a compound already used studied due to their numerous properties. To minimize the degradative effects resulting from environmental factors or thermal processing, one possibility is the formation of inclusion complexes with β-CD in order to increase their thermal stability and provide controlled release. The objective of this study was to obtain and characterize β-CD-eugenol microcapsules obtained in solutions containing low concentrations of Eugenol compound. The result showed the formation of the microcapsules but with low antibacterial actions due the low concentration of Eugenol in the complexes. The encapsulations constant (Kc) determined is 27.62 M-1 and the FTIR spectra indicated the microencapsulation.

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