Measuring Size-Dependent Enthalpy Alterations in Dry Milled White Rice via Bomb Calorimetry

Wang, William B.; Dezieck, Alex; Peng, Bai-Jing

doi:10.12691/jfnr-10-1-10

Cited by 3 publications

(4 citation statements)

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“…Due to its high oxidation potential, DMF has the capability of reducing metal salts and forming nanoparticles during colloidal solution formation [67]. When synthesized into nanomaterials via reduction and electrospinning, CuNPs undergo significant physiochemical changes that allows them to have better permeability in pathogens than their bulk counterparts due to their size-dependent crystalline structure and high surface area-tovolume ratio [68]. The electrostatic interactions between the positively charged copper ions and the negatively charged peptidoglycan-based bacteria cell wall ruptures the cell wall via depolarization and releases internal cell contents [62,69].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of Electrospun Polyacrylonitrile Copper Nanoparticle Nanofibers on Antibiotic Resistant Pathogens and Methicillin Resistant Staphylococcus aureus (MRSA)

Wang¹,

Clapper²

2022

Nanomaterials

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Bacteria induced diseases such as community-acquired pneumonia (CAP) are easily transmitted through respiratory droplets expelled from a person’s nose or mouth. It has become increasingly important for researchers to discover materials that can be implemented in in vitro surface contact settings which disrupt bacterial growth and transmission. Copper (Cu) is known to have antibacterial properties and have been used in medical applications. This study investigates the antibacterial properties of polyacrylonitrile (PAN) based nanofibers coated with different concentrations of copper nanoparticles (CuNPs). Different concentrations of copper sulfate (CuSO4) and polyacrylonitrile (PAN) were mixed with dimethylformamide (DMF) solution, an electrospinning solvent that also acts as a reducing agent for CuSO4, which forms CuNPs and Cu ions. The resulting colloidal solutions were electrospun into nanofibers, which were then characterized using various analysis techniques. Methicillin-Resistant isolates of Staphylococcus aureus, an infective strain that induces pneumonia, were incubated with cutouts of various nanocomposites using disk diffusion methods on Luria-Bertani (LB) agar to test for the polymers’ antibacterial properties. Herein, we disclose that PAN-CuNP nanofibers have successfully demonstrated antibacterial activity against bacteria that were otherwise resistant to highly effective antibiotics. Our findings reveal that PAN-CuNP nanofibers have the potential to be used on contact surfaces that are at risk of contracting bacterial infections, such as masks, in vivo implants, or surgical intubation.

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Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of Electrospun Polyacrylonitrile Copper Nanoparticle Nanofibers on Antibiotic Resistant Pathogens and Methicillin Resistant Staphylococcus aureus (MRSA)

Wang¹,

Clapper²

2022

Nanomaterials

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“…Throughout history, silver has been used as a form of wound dressing for burns and bacterial infections . When synthesized into silver nanoparticles (AgNPs), silver undergoes significant physiochemical changes, allowing it to obtain improved permeability in pathogens compared to its bulk counterparts due to an increased surface area-to-volume ratio. , As AgNPs come into contact with microbes, they can bind to their cell wall and cell membrane and begin inhibiting respiration . For instance, AgNPs can destroy the cell wall of C.…”

Section: Introductionmentioning

confidence: 99%

“… 23 When synthesized into silver nanoparticles (AgNPs), silver undergoes significant physiochemical changes, allowing it to obtain improved permeability in pathogens compared to its bulk counterparts due to an increased surface area-to-volume ratio. 24 , 25 As AgNPs come into contact with microbes, they can bind to their cell wall and cell membrane and begin inhibiting respiration. 26 For instance, AgNPs can destroy the cell wall of C. albicans by disrupting its β-glucan synthase, as β-glucan is the main constituent within the cell wall of C. albicans .…”

Section: Introductionmentioning

confidence: 99%

Electrospun Polyacrylonitrile Silver(I,III) Oxide Nanoparticle Nanocomposites as Alternative Antimicrobial Materials

Wang¹,

Pan

Huang

et al. 2022

ACS Omega

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Infectious microbial diseases can easily be transferred from person to person in the air or via high contact surfaces. As a result, researchers must aspire to create materials that can be implemented in surface contact applications to disrupt pathogen growth and transmission. This study examines the antimicrobial properties of polyacrylonitrile (PAN) nanofibers coated with silver nanoparticles (AgNPs) and silver(I,III) oxide. PAN was homogenized with varied weight concentrations of silver nitrate (AgNO3) in N,N-dimethylformamide solution, a common organic solvent that serves as both an electrospinning solvent and as a reducing agent that forms AgNPs. The subsequent colloids were electrospun into nanofibers, which were then characterized via various analysis techniques, including scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis, dynamic light scattering, and X-ray photoelectron spectroscopy. A total of 10 microbes, including 7 strains of Gram-positive bacteria, 2 strains of Gram-negative bacteria, and Candida albicans, were incubated with cutouts of various PAN-AgNP nanocomposites using disk diffusion methods to test for the nanocomposites’ antimicrobial efficiency. We report that our electrospun PAN-AgNP nanocomposites contain 100% AgO, a rare, mixed oxidation state of silver(I,III) oxide that is a better sterilizing agent than conventional nanosilver. PAN-AgNP nanocomposites also retain a certain degree of antimicrobial longevity; samples stored for approximately 90 days demonstrate a similar antimicrobial activity against Escherichia coli (E. coli) and Lactobacillus crispatus (L. crispatus) when compared to their newly electrospun counterparts. Moreover, our results indicate that PAN-AgNP nanocomposites successfully display antimicrobial activity against various bacteria and fungi strains regardless of their resistance to conventional antibiotics. Our study demonstrates that PAN-AgNP nanocomposites, a novel polymer material with long-term universal antimicrobial stability, can potentially be applied as a universal antimicrobial on surfaces at risk of contracting microbial infections and alleviate issues related to antibiotic overuse and microbial mutability.

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“…Throughout history, silver has been used as a form of wound dressing for burns and bacterial infections 23 . When synthesized into silver nanoparticles (AgNPs), silver undergoes significant physiochemical changes, allowing it to obtain improved permeability in pathogens compared to its bulk counterparts due to an increased surface area-to-volume ratio 24,25 . As AgNPs come into contact with microbes, they can bind to their cell wall and cell membrane and begin inhibiting respiration 26 .…”

Section: Introductionmentioning

confidence: 99%

Electrospun Polyacrylonitrile Silver Nanoparticle (PAN-AgNP) Nanocomposites as Alternative Antimicrobial Materials

Wang¹,

Pan

Huang

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Infectious microbial diseases can easily be transferred from person to person in the air or via high contact surfaces. As a result, researchers must aspire to create materials that can be implemented in surface contact applications to disrupt pathogen growth and transmission. Silver (Ag) is known to possess antimicrobial activity and has been used in the past in various pharmaceutical applications. Herein, we examine the antimicrobial properties of polyacrylonitrile (PAN) nanofibers coated with different concentrations of silver nanoparticles (AgNPs). Polyacrylonitrile (PAN) was homogenized with varied weight concentrations of silver nitrate (AgNO3) in N,N-Dimethylformamide (DMF) solution, a common organic solvent that serves as both an electrospinning solvent and as a reducing agent that forms AgNPs. The subsequent colloids were electrospun into nanofibers, which were then characterized via various analysis techniques, including Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray (EDX) Analysis, Dynamic Light Scattering (DLS), and X-Ray Photoelectron Spectroscopy (XPS). 10 microbes, including 7 strains of Gram-positive bacteria, 2 strains of Gram-negative bacteria, and Candida albicans were incubated with cutouts of various PAN-AgNP nanocomposites using disk diffusion methods to test for the nanocomposites’ antimicrobial efficiency. We report that PAN-AgNP nanocomposites retain a certain degree of antimicrobial longetivity; samples stored for approximately 90 days demonstrate similar antimicrobial activity against Escherichia coli (E. coli) and Lactobacillus crispatus (L. crispatus) when compared to their newly electrospun counterparts. Moreover, our results indicate that PAN-AgNP nanocomposites successfully display antimicrobial activity against various bacteria and fungi strains regardless of their resistance to conventional antibiotics. Our study demonstrates that PAN-AgNP nanocomposites can potentially be applied to surfaces at risk of contracting microbial infections.

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Measuring Size-Dependent Enthalpy Alterations in Dry Milled White Rice via Bomb Calorimetry

Cited by 3 publications

References 0 publications

Antibacterial Activity of Electrospun Polyacrylonitrile Copper Nanoparticle Nanofibers on Antibiotic Resistant Pathogens and Methicillin Resistant Staphylococcus aureus (MRSA)

Antibacterial Activity of Electrospun Polyacrylonitrile Copper Nanoparticle Nanofibers on Antibiotic Resistant Pathogens and Methicillin Resistant Staphylococcus aureus (MRSA)

Electrospun Polyacrylonitrile Silver(I,III) Oxide Nanoparticle Nanocomposites as Alternative Antimicrobial Materials

Electrospun Polyacrylonitrile Silver Nanoparticle (PAN-AgNP) Nanocomposites as Alternative Antimicrobial Materials

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