Development of a PCL-PEO double network colorimetric pH sensor using electrospun fibers containing Hibiscus rosa sinensis extract and silver nanoparticles for food monitoring

2021 ◽  
pp. 130813
Author(s):  
Lavernchy Jovanska ◽  
Chun-Hui Chiu ◽  
Yi-Cheun Yeh ◽  
Wen-Dee Chiang ◽  
Chang-Chi Hsieh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Ph Sensor ◽  
Electrospun Fibers ◽  
Double Network ◽  
Hibiscus Rosa Sinensis ◽  
Food Monitoring

Electrospun Antibacterial Chitosan/Poly (Vinyl Alcohol) Nanofibers Containing Silver Nanoparticles

2010 ◽  
Vol 152-153 ◽  
pp. 1333-1336 ◽  
Author(s):  
Xu Pin Zhuang ◽  
Zheng Li ◽  
Wei Min Kang ◽  
Bo Wen Cheng
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Electrospun Fibers ◽  
X Ray ◽  
High Antibacterial Activity ◽  
Transmission Electron ◽  
Scanning Electron

New chitosan/poly (vinyl alcohol) (PVA) nanofibers functionalized with silver nanoparticles were electrospun using solutions of PVA blended with silver nanoparticles-chitosan composites. The structure of the electrospun fibers were studied with the aid of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicated that the electrospun fibers smoothly with 220 to 650 nm diameter, and the silver nanoparticles were successfully embed into the fibers which show high antibacterial activity against E.coli.

scholarly journals Silver Nanoparticles Decorated with PEGylated Porphyrins as Potential Theranostic and Sensing Agents

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2764
Author(s):  
Angelo Nicosia ◽  
Antonio Abbadessa ◽  
Fabiana Vento ◽  
Antonino Mazzaglia ◽  
Placido Giuseppe Mineo
Keyword(s):  
Silver Nanoparticles ◽  
Thermal Analyses ◽  
Ph Sensor ◽  
Spectroscopic Properties ◽  
The Other ◽  
Porphyrin Derivatives ◽  
Vis Spectroscopy ◽  
Range Alignment ◽  
Biomedical Field ◽  
Biological Environment

Silver nanoparticles (AgNPs) stand out over other metal nanoparticles thanks to their peculiar bactericidal and spectroscopic properties. Tunability of the AgNPs chemical–physical properties could be provided through their organic covalent coating. On the other hand, PEGylated porphyrin derivatives are versatile heteromacrocycles investigated for uses in the biomedical field as cytotoxic and tracking agents, but also as sensors. In this work, an easy multi-step approach was employed to produce coated silver nanoparticles. Specifically, the AgNPs were functionalized with 5,10,15-[p-(ω-methoxy-polyethyleneoxy)phenyl]-20-(p-hydroxyphenyl)-porphyrin (P(PEG350)3), using chloropropanethiol as a coupling agent. The P(PEG350)3 was structurally characterized through MALDI-TOF mass spectrometry, NMR spectroscopy and thermal analyses. The functionalization of AgNPs was monitored step-by-step employing UV-Vis spectroscopy, dynamic light scattering and thermogravimetric techniques. HRTEM and STEM measurements were used to investigate the morphology and the composition of the resulting nanostructured system (AgNP@P(PEG350)3), observing a long-range alignment of the outer porphyrin layer. The AgNP@P(PEG350)3 combines the features of the P(PEG350)3 with those of AgNPs, producing a potential multifunctional theranostic tool. The nanosystem revealed itself suitable as a removable pH sensor in aqueous solutions and potentially feasible for biological environment applications.

scholarly journals Hydrogel Microdomain Encapsulation of Stable Functionalized Silver Nanoparticles for SERS pH and Urea Sensing

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3521 ◽  
Author(s):  
Alexander Quinn ◽  
Yil-Hwan You ◽  
Michael J. McShane
Keyword(s):  
Silver Nanoparticles ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Ph Sensor ◽  
Surface Enhanced Raman Spectroscopy ◽  
Enzymatic Reactions ◽  
Ph Sensing ◽  
Hydrogel Matrix ◽  
Wide Range

Conceptual and commercial examples of implantable sensors have been limited to a relatively small number of target analytes, with a strong focus on glucose monitoring. Recently, surface-enhanced Raman spectroscopy (SERS) pH sensors were demonstrated to track acid-producing enzymatic reactions targeting specific analytes. We show here that SERS pH tracking in the basic regime is also possible, and can be used to monitor urea concentration. To accomplish this, we developed a hydrogel consisting of polyelectrolyte multilayer microcapsules containing a SERS-sensitive pH reporter (4-mercapopyridine capped silver nanoparticles modified with bovine serum albumin). This pH sensing material exhibited a sensitive Raman scattering response to a wide range of pH from 6.5–9.7. By incorporating urease into the hydrogel matrix, the new sensor was capable of distinguishing urea concentrations of 0, 0.1, 1, and 10 mM. We also found that bovine serum albumin (BSA) prevented severe aggregation of the nanoparticle-based pH sensor, which improved sensing range and sensitivity. Furthermore, BSA safeguarded the pH sensor during the encapsulation procedure. Together, the combination of materials represents a novel approach to enabling optical sensing of reactions that generate pH changes in the basic range.

Preparation of Ultrafine Poly(ε-Caprolactone) Fibers Containing Silver Nanoparticles via Electrospinning Method

2011 ◽  
Vol 332-334 ◽  
pp. 1235-1238 ◽  
Author(s):  
Yong Tang Jia ◽  
Qing Qing Liu ◽  
Xiang Ying Zhu
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Average Diameter ◽  
Contact Angles ◽  
Electrospun Fibers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrospinning Method ◽  
Scanning Electron

Electrospun poly(ε-caprolactone) (PCL) fibers containing silver nanoparticles were successfully prepared from PCL solutions added silver collide. The silver collide were obtained by N, N-dimethylformamide (DMF) reducing silver nitrate (AgNO3). The effects of PCL concentration and the content of silver nanoparticles on composite fibers morphology were characterized by field-emission scanning electron microscopy (FESEM). The existence of Ag nanoparticles on the electrospun fibers was approved by X-Ray diffraction (XRD). Simultaneously, the contact angles of fiber membranes were measured. The results indicated that uniform fibers were obtained when PCL concentration was 9wt%, the average diameter of fiber was significantly decreased as increasing the amount of silver collide, and Ag nanoparticles were successfully incorporated into the PCL fibers.

Can natural fibers be a silver bullet? Antibacterial cellulose fibers through the covalent bonding of silver nanoparticles to electrospun fibers

2016 ◽  
Vol 27 (5) ◽  
pp. 055102 ◽  
Author(s):  
Yingying Zheng ◽  
Chao Cai ◽  
Fuming Zhang ◽  
Jonathan Monty ◽  
Robert J Linhardt ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Natural Fibers ◽  
Cellulose Fibers ◽  
Covalent Bonding ◽  
Electrospun Fibers ◽  
Silver Bullet

Comparison studies on catalytic properties of silver nanoparticles biosynthesized via aqueous leaves extract of Hibiscus rosa sinensis and Imperata cylindrica

2018 ◽  
Author(s):  
Afiza Ahmad Fairuzi ◽  
Noor Najmi Bonnia ◽  
Rabiatuladawiyah Md. Akhir ◽  
Hazizan Md Akil ◽  
Sabrina M. Yahya ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Properties ◽  
Imperata Cylindrica ◽  
Hibiscus Rosa Sinensis

scholarly journals PLA Electrospun Fibers Reinforced with Organic and Inorganic Nanoparticles: A Comparative Study

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4925
Author(s):  
Adrián Leonés ◽  
Valentina Salaris ◽  
Alicia Mujica-Garcia ◽  
Marina P. Arrieta ◽  
Daniel Lopez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Point Of View ◽  
Inorganic Nanoparticles ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Electrospun Fibers ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
Grafting From

In this work, different poly (lactic acid) (PLA)-based nanocomposite electrospun fibers, reinforced with both organic and inorganic nanoparticles, were obtained. As organic fibers, cellulose nanocrystals, CNC, both neat and functionalized by “grafting from” reaction, chitosan and graphene were used; meanwhile, hydroxyapatite and silver nanoparticles were used as inorganic fibers. All of the nanoparticles were added at 1 wt% with respect to the PLA matrix in order to be able to compare their effect. The main aim of this work was to study the morphological, thermal and mechanical properties of the different systems, looking for differences between the effects of the addition of organic or inorganic nanoparticles. No differences were found in either the glass transition temperature or the melting temperature between the different electrospun systems. However, systems reinforced with both neat and functionalized CNC exhibited an enhanced degree of crystallinity of the electrospun fibers, by up to 12.3%. From a mechanical point of view, both organic and inorganic nanoparticles exhibited a decreased elastic modulus and tensile strength in comparison to neat electrospun PLA fibers, improving their elongation at break. Furthermore, all of the organic and inorganic reinforced systems disintegrated under composting conditions after 35 days.

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