Dielectric characterization of colloidal solutions of retinoic acid embedded in microspheres of polyvinyl alcohol

Tenorio, Alexandro C.; Lima, E.G. de; Melo, Celso P. de

doi:10.1016/j.colsurfa.2004.10.028

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…Further increase or decrease led to the decrease in the CNPs yield. Our findings are consistent with those of El-Naggar et al 2 who stated that the maximum CNPs biosynthetic yield, using P. graveolens leaves extract, was calculated to be 9.73 mg/mL after 57.53 min, while de Oliveira et al 87 reported that a 12-h incubation period was adequate for CNPs production. Sathiyabama and Parthasarathy 48 synthesized CNPs at with a shorter time of 30 min using magnetic stirring.…”

Section: Chitosan Nanoparticles Biosynthesis Valuesupporting

confidence: 92%

Artificial intelligence-based optimization for chitosan nanoparticles biosynthesis, characterization and in‑vitro assessment of its anti-biofilm potentiality

El‐Naggar

Dalal

Zweil

et al. 2023

Sci Rep

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Chitosan nanoparticles (CNPs) are promising biopolymeric nanoparticles with excellent physicochemical, antimicrobial, and biological properties. CNPs have a wide range of applications due to their unique characteristics, including plant growth promotion and protection, drug delivery, antimicrobials, and encapsulation. The current study describes an alternative, biologically-based strategy for CNPs biosynthesis using Oleaeuropaea leaves extract. Face centered central composite design (FCCCD), with 50 experiments was used for optimization of CNPs biosynthesis. The artificial neural network (ANN) was employed for analyzing, validating, and predicting CNPs biosynthesis using Oleaeuropaea leaves extract. Using the desirability function, the optimum conditions for maximum CNPs biosynthesis were determined theoretically and verified experimentally. The highest experimental yield of CNPs (21.15 mg CNPs/mL) was obtained using chitosan solution of 1%, leaves extract solution of 100%, initial pH 4.47, and incubation time of 60 min at 53.83°C. The SEM and TEM images revealed that CNPs had a spherical form and varied in size between 6.91 and 11.14 nm. X-ray diffraction demonstrates the crystalline nature of CNPs. The surface of the CNPs is positively charged, having a Zeta potential of 33.1 mV. FTIR analysis revealed various functional groups including C–H, C–O, CONH2, NH2, C–OH and C–O–C. The thermogravimetric investigation indicated that CNPs are thermally stable. The CNPs were able to suppress biofilm formation by P.aeruginosa,S.aureus and C.albicans at concentrations ranging from 10 to 1500 µg/mL in a dose-dependent manner. Inhibition of biofilm formation was associated with suppression of metabolic activity, protein/exopolysaccharide moieties, and hydrophobicity of biofilm encased cells (r ˃ 0.9, P = 0.00). Due to their small size, in the range of 6.91 to 11.14 nm, CNPs produced using Oleaeuropaea leaves extract are promising for applications in the medical and pharmaceutical industries, in addition to their potential application in controlling multidrug-resistant microorganisms, especially those associated with post COVID-19 pneumonia in immunosuppressed patients.

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Section: Chitosan Nanoparticles Biosynthesis Valuesupporting

confidence: 92%

Artificial intelligence-based optimization for chitosan nanoparticles biosynthesis, characterization and in‑vitro assessment of its anti-biofilm potentiality

El‐Naggar

Dalal

Zweil

et al. 2023

Sci Rep

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show abstract

“…The average size of the composite aggregates was determined by scanning electron microscopy and by light scattering experiments. By combining EDX and FTIR analysis of the samples, we have confirmed the possibility of control of the relative amount of Fe 3 O 4 and PPY present in the aggregates by appropriate changes in the preparation parameters, and therefore the properties of interest can be optimized by chemometric methods [47]. For instance, the electrical and magnetic characteristics of the resulting samples are suitable for adjusting by a proper fine-tuning of the relative concentrations of PPY and Fe 3 O 4 .…”

Section: Discussionmentioning

confidence: 77%

Electrical impedance spectroscopy investigation of surfactant–magnetite–polypyrrole particles

Oliveira

Andrade

Melo

2008

Journal of Colloid and Interface Science

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“…By applying an external electric field of varying frequency and using EIS techniques, we have been able to map the relaxation times τ rel characteristic of the electric dipoles present in the system and, in this manner, have obtained a better description of the processes of molecular reorientation [19,20] and of the corresponding evolution of the aggregate formation in the solution. Due to the initial polarization and subsequent reorientation of the polar groups in the medium, the reaction field induced in the sample will be out of phase relative to the excitation signal.…”

Section: Resultsmentioning

confidence: 99%

Aggregation of methyl orange probed by electrical impedance spectroscopy

Oliveira

Melo

2006

Journal of Colloid and Interface Science

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Dielectric characterization of colloidal solutions of retinoic acid embedded in microspheres of polyvinyl alcohol

Cited by 9 publications

References 5 publications

Artificial intelligence-based optimization for chitosan nanoparticles biosynthesis, characterization and in‑vitro assessment of its anti-biofilm potentiality

Artificial intelligence-based optimization for chitosan nanoparticles biosynthesis, characterization and in‑vitro assessment of its anti-biofilm potentiality

Electrical impedance spectroscopy investigation of surfactant–magnetite–polypyrrole particles

Aggregation of methyl orange probed by electrical impedance spectroscopy

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