PolymersPolymers as Bioactive Materials-I: Natural and Non-degradable Polymers

2017 ◽  
pp. 21-51
Author(s):  
Gurbinder Kaur
Keyword(s):  
Degradable Polymers ◽  
Bioactive Materials

scholarly journals (Bio)Degradable Polymeric Materials for Sustainable Future—Part 3: Degradation Studies of the PHA/Wood Flour-Based Composites and Preliminary Tests of Antimicrobial Activity

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2200
Author(s):  
Marta Musioł ◽  
Sebastian Jurczyk ◽  
Michał Sobota ◽  
Magdalena Klim ◽  
Wanda Sikorska ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Degradation Products ◽  
Wood Flour ◽  
Polymeric Materials ◽  
Wood Products ◽  
Ionization Mass ◽  
Degradable Polymers ◽  
Scanning Calorimetry ◽  
Bioactive Materials ◽  
Recycled Waste

The need for a cost reduction of the materials derived from (bio)degradable polymers forces research development into the formation of biocomposites with cheaper fillers. As additives can be made using the post-consumer wood, generated during wood products processing, re-use of recycled waste materials in the production of biocomposites can be an environmentally friendly way to minimalize and/or utilize the amount of the solid waste. Also, bioactive materials, which possess small amounts of antimicrobial additives belong to a very attractive packaging industry solution. This paper presents a study into the biodegradation, under laboratory composting conditions, of the composites that consist of poly[(R)-3-hydroxybutyrate-co-4-hydroxybutyrate)] and wood flour as a polymer matrix and natural filler, respectively. Thermogravimetric analysis, differential scanning calorimetry and scanning electron microscopy were used to evaluate the degradation progress of the obtained composites with different amounts of wood flour. The degradation products were characterized by multistage electrospray ionization mass spectrometry. Also, preliminary tests of the antimicrobial activity of selected materials with the addition of nisin were performed. The obtained results suggest that the different amount of filler has a significant influence on the degradation profile.

scholarly journals Enzymic Thin Film Coatings for Bioactive Materials

2008 ◽  
Vol 24 (3) ◽  
pp. 714-719 ◽  
Author(s):  
X. Tong ◽  
A. Trivedi ◽  
H. Jia ◽  
M. Zhang ◽  
P. Wang
Keyword(s):  
Thin Film ◽  
Bioactive Materials ◽  
Film Coatings ◽  
Thin Film Coatings

scholarly journals New approach in process intensification based on subcritical water, as green solvent, in propolis oil in water nanoemulsion preparation

2021 ◽  
Vol 10 (1) ◽  
pp. 208-218
Author(s):  
Fatemeh Ghavidel ◽  
Afshin Javadi ◽  
Navideh Anarjan ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Zeta Potential ◽  
Subcritical Water ◽  
Process Intensification ◽  
Processing Parameters ◽  
Bioactive Materials ◽  
Propolis Extract ◽  
High Antibacterial Activity ◽  
Oil In Water

Abstract Subcritical water was used to provide propolis oil in water (O/W) nanoemulsions. To monitor and detect the main bioactive compounds of the prepared propolis extract, gas chromatography demonstrated that there were 47 bioactive materials in the propolis extract, among which pinostrobin chalcone and pinocembrin were the two key components. Effectiveness of two processing parameters such as the amount of saponin (0.5–2.0 g) and propolis extract (0.1–0.6 g), on particle size, polydispersity index (PDI), zeta potential, and antioxidant activity of the provided nanoemulsions, was evaluated. Results demonstrated that more desirable propolis O/W nanoemulsion, with minimum particle size (144.06 nm) and PDI (0.286), and maximum zeta potential (−21.71 mV) and antioxidant activity (90.86%) were made using 0.50 g of saponin and 0.53 g of propolis extract. Further analysis revealed that the prepared nanoemulsion based on optimum processing conditions had spherical shaped propolis nanodroplets in the colloidal solution with turbidity and maximum broad absorption peak of 0.08 a.u. and 292 nm, respectively. The prepared nanoemulsion had high antibacterial activity against both selected bacteria strains namely, Staphylococcus aureus and Escherichia coli.

pH-Degradable Polymers as Impermanent Antimicrobial Agents for Environmental Sustainability

2021 ◽  
Vol 4 (2) ◽  
pp. 1544-1551
Author(s):  
Diane S. W. Lim ◽  
Yuan Yuan ◽  
Yugen Zhang
Keyword(s):  
Environmental Sustainability ◽  
Antimicrobial Agents ◽  
Degradable Polymers

Regeneration of pulp-dentin complex using human stem cells of the apical papilla: in vivo interaction with two bioactive materials

2021 ◽  
Author(s):  
Diana B. Sequeira ◽  
Ana Rafaela Oliveira ◽  
Catarina M. Seabra ◽  
Paulo J. Palma ◽  
Carlos Ramos ◽  
...  
Keyword(s):  
Stem Cells ◽  
Human Stem Cells ◽  
Bioactive Materials ◽  
Apical Papilla

scholarly journals Development of A Nano-Apatite Based Composite Sealer for Endodontic Root Canal Filling

2021 ◽  
Vol 5 (1) ◽  
pp. 30
Author(s):  
Angelica Bertacci ◽  
Daniele Moro ◽  
Gianfranco Ulian ◽  
Giovanni Valdrè
Keyword(s):  
Citric Acid ◽  
Liquid Phase ◽  
Calcium Phosphate ◽  
Root Canal ◽  
Acid Attack ◽  
Root Canal Filling ◽  
Bioactive Materials ◽  
Dentinal Tubules ◽  
Sealing Capacity ◽  
Endodontic Sealers

Recently, endodontic sealers based on injectable bioactive materials were proposed to improve the filling of anatomical irregularities during root canal obturation. In this context, this preliminary work investigated the possibility of realizing a new calcium phosphate-based composite sealer for root canal filling with an optimized composition on setting kinetics and dentin tubules occlusion. Several calcium phosphate/liquid phase mixtures were initially evaluated for their workability, finding two suitable formulations. Both of them contained 66 wt.% of a nano-apatite-based cement (solid powdered phase). The liquid phase (34 wt.%) comprised 13.6% propanediol and 20.4% PEG 1000 (formulation 1), and formulation 2 comprised 27.2% glycerin and 6.8% PEG 200 (formulation 2). Then, these formulations were tested by means of permeability measurements and observation by scanning electron microscopy of treated model dentin samples. Both formulations succeeded in occluding dentinal tubules: the first one was able to create a full-bodied layer on dentin surface and, moreover, to resist, at least to a large extent, against citric acid attack. The second one showed a lower effectiveness after citric acid exposure. The composite compound that better satisfied the overall required characteristics of use, workability and sealing capacity was formulation 1.

scholarly journals A New Nanocomposite Packaging Based on LASiS-Generated AgNPs for the Preservation of Apple Juice

Antibiotics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 760
Author(s):  
Maria Chiara Sportelli ◽  
Antonio Ancona ◽  
Annalisa Volpe ◽  
Caterina Gaudiuso ◽  
Valentina Lavicita ◽  
...  
Keyword(s):  
Metal Ion ◽  
Chemical Characterization ◽  
Average Diameter ◽  
Biological Action ◽  
Metal Species ◽  
Ion Release ◽  
Bioactive Materials ◽  
Transmission Electron ◽  
Metal Ion Release ◽  
Bulk Chemical

Designing bioactive materials, with controlled metal ion release, exerting a significant biological action and associated to low toxicity for humans, is nowadays one of the most important challenges for our community. The most looked-for nanoantimicrobials are capable of releasing metal species with defined kinetic profiles, either by slowing down or inhibiting bacterial growth and pathogenic microorganism diffusion. In this study, laser ablation synthesis in solution (LASiS) has been used to produce bioactive Ag-based nanocolloids, in isopropyl alcohol, which can be used as water-insoluble nano-reservoirs in composite materials like poly(3-hydroxybutyrate-co-3-hydroxyvalerate). Infrared spectroscopy was used to evaluate the chemical state of pristine polymer and final composite material, thus providing useful information about synthesis processes, as well as storage and processing conditions. Transmission electron microscopy was exploited to study the morphology of nano-colloids, along with UV-Vis for bulk chemical characterization, highlighting the presence of spheroidal particles with average diameter around 12 nm. Electro-thermal atomic absorption spectroscopy was used to investigate metal ion release from Ag-modified products, showing a maximum release around 60 ppb, which ensures an efficient antimicrobial activity, being much lower than what recommended by health institutions. Analytical spectroscopy results were matched with bioactivity tests carried out on target microorganisms of food spoilage.

Coating of fertilizers by degradable polymers

2002 ◽  
Vol 242 (1-2) ◽  
pp. 399-404 ◽  
Author(s):  
M. Devassine ◽  
F. Henry ◽  
P. Guerin ◽  
X. Briand
Keyword(s):  
Degradable Polymers

scholarly journals Solid-state fermentation of soybean residues for bioflocculant production in a pilot-scale bioreactor system

2014 ◽  
Vol 70 (6) ◽  
pp. 1032-1039 ◽  
Author(s):  
Zufarzaana Zulkeflee ◽  
Antoni Sánchez
Keyword(s):  
Solid State ◽  
Solid State Fermentation ◽  
Microbial Growth ◽  
Future Prospect ◽  
Pilot Scale ◽  
Scale Level ◽  
Bioactive Materials ◽  
Current Dependence ◽  
Death Phase ◽  
Bioreactor System

An innovative approach using soybean residues for the production of bioflocculants through solid-state fermentation was carried out in 4.5 L near-to-adiabatic bioreactors at pilot-scale level. An added inoculum of the strain Bacillus subtilis UPMB13 was tested in comparison with control reactors without any inoculation after the thermophilic phase of the fermentation. The flocculating performances of the extracted bioflocculants were tested on kaolin suspensions, and crude bioflocculants were obtained from 20 g of fermented substrate through ethanol precipitation. The production of bioflocculants was observed to be higher during the death phase of microbial growth. The bioflocculants were observed to be granular in nature and consisted of hydroxyl, carboxyl and methoxyl groups that aid in their flocculating performance. The results show the vast potential of the idea of using wastes to produce bioactive materials that can replace the current dependence on chemicals, for future prospect in water treatment applications.

Facile Fabrication of Degradable Polyurethane Thermosets with High Mechanical Strength and Toughness via the Cross-linking of Triple Boron-Urethane Bonds

2021 ◽  
Author(s):  
Chunyang Bao ◽  
Xuhao Zhang ◽  
Pengdong Yu ◽  
Qingzhong Li ◽  
Yusheng Qin ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Cross Linking ◽  
Degradable Polymers ◽  
Sustainable Society ◽  
High Mechanical Strength ◽  
Facile Fabrication ◽  
The Cross ◽  
Strength And Toughness

Degradable polymers that play an increasingly important role in the development of sustainable society are highly demanded to feature not only high mechanical strength, but also exhibit superior toughness. Herein,...

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