Adsorption mechanisms of l-Glutathione on Au and controlled nano-patterning through Dip Pen Nanolithography

Calboréan, Adrian; Martin, Flavia; Marconi, Daniel; Turcu, Rodica; Kacsó, Irén; Buimaga-Iarinca, Luiza; Graur, Florin; Turcu, Ioan

doi:10.1016/j.msec.2015.07.042

Cited by 25 publications

(13 citation statements)

References 61 publications

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“…The N 1s peak was further fitted into three more components (Figure c); the peaks at 399.9, 400.43, and 401 eV were related to N–C, N–CO, and N–H, respectively, particularly positively charged nitrogen . The oxygen spectrum, as shown in Figure d, exhibited two components from OC at 530.56 eV and OC–N at 531.32 eV …”

Section: Resultsmentioning

confidence: 94%

Electrospun Zein Nanofiber as a Green and Recyclable Adsorbent for the Removal of Reactive Black 5 from the Aqueous Phase

Qureshi

Kim

Ahmed

et al. 2017

ACS Sustainable Chem. Eng.

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Zein polymer is drawing intense research interest because of its nontoxicity, biodegradability, and unique structural properties. Zein-based electrospun nanofibers are prepared from an 80% ethanolic solution and are used as a nanoadsorbent material for the confiscation of reactive black 5 (RB5) dye from aqueous solutions. The electrospun nanofibers possessed an extraordinarily high capacity for RB5 uptake compared to their powder and film analogues. Zein nanofibers exhibited exceptionally efficient performance in removing RB5 after contact for only 20 min at room temperature and a normal working pH. The mechanism of dye–zein interaction was chiefly controlled via hydrophobic, electrostatic forces and hydrogen bond interactions. Experimental data followed a pseudo-second-order model, and the Langmuir adsorption isotherm was the most appropriate mechanism governing RB5 adsorption. The dye-loaded zein nanofibers were directly re-electrospun to achieve a recyclable and green adsorbent, preventing the consumption of toxic and expensive reagents for elution of RB5.

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Section: Resultsmentioning

confidence: 94%

Electrospun Zein Nanofiber as a Green and Recyclable Adsorbent for the Removal of Reactive Black 5 from the Aqueous Phase

Qureshi

Kim

Ahmed

et al. 2017

ACS Sustainable Chem. Eng.

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“…Glutathione (GSH) is a tripeptide consisting of the three amino acids, glutamic acid, cysteine, and glycine. It can bind to gold via the thiol group of the central cysteine after reduction with the strong reducing agent NaBH 4 , which leads to ultrasmall gold nanoparticles [ 67 , 68 , 69 , 70 , 71 , 72 ]. The Au-GSH nanoparticles were characterized with respect to size and composition.…”

Section: Resultsmentioning

confidence: 99%

Pathways for Oral and Rectal Delivery of Gold Nanoparticles (1.7 nm) and Gold Nanoclusters into the Colon: Enteric-Coated Capsules and Suppositories

et al. 2021

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Two ways to deliver ultrasmall gold nanoparticles and gold-bovine serum albumin (BSA) nanoclusters to the colon were developed. First, oral administration is possible by incorporation into gelatin capsules that were coated with an enteric polymer. These permit the transfer across the stomach whose acidic environment damages many drugs. The enteric coating dissolves due to the neutral pH of the colon and releases the capsule’s cargo. Second, rectal administration is possible by incorporation into hard-fat suppositories that melt in the colon and then release the nanocarriers. The feasibility of the two concepts was demonstrated by in-vitro release studies and cell culture studies that showed the easy redispersibility after dissolution of the respective transport system. This clears a pathway for therapeutic applications of drug-loaded nanoparticles to address colon diseases, such as chronic inflammation and cancer.

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“…Finally, the incorporation of Fmoc–glycine on the surface of encapsulated TiO 2 @SiO 2 nanoparticles only slightly changed the chemistry, based on XPS analyses. Further decay in the O1s signal strength from titanium and silicon oxides was observed, except for the component located at 531.6 eV, which source next to SiO 2 is also C=O bonds in glycine [ 64 , 65 ]. Based on the XPS analyses of core level Si2p, O1s and N1s binding energy range ( Figure 6 a–c), the chemistry of SiO 2 and NH 2 species did not change significantly between TiO 2 @SiO 2 –(CH 2 ) 3 –NH 2 and TiO 2 @SiO 2 –(CH 2 ) 3 –NH–Gly–Fmoc nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Efficient Method for the Concentration Determination of Fmoc Groups Incorporated in the Core-Shell Materials by Fmoc–Glycine

et al. 2020

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In this paper, we described the synthesis procedure of TiO2@SiO2 core-shell modified with 3-(aminopropyl)trimethoxysilane (APTMS). The chemical attachment of Fmoc–glycine (Fmoc–Gly–OH) at the surface of the core-shell structure was performed to determine the amount of active amino groups on the basis of the amount of Fmoc group calculation. We characterized nanostructures using various methods: transmission electron microscope (TEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) to confirm the modification effectiveness. The ultraviolet-visible spectroscopy (UV-vis) measurement was adopted for the quantitative determination of amino groups present on the TiO2@SiO2 core-shell surface by determination of Fmoc substitution. The nanomaterials were functionalized by Fmoc–Gly–OH and then the fluorenylmethyloxycarbonyl (Fmoc) group was cleaved using 20% (v/v) solution of piperidine in DMF. This reaction led to the formation of a dibenzofulvene–piperidine adduct enabling the estimation of free Fmoc groups by measurement the maximum absorption at 289 and 301 nm using UV-vis spectroscopy. The calculations of Fmoc loading on core-shell materials was performed using different molar absorption coefficient: 5800 and 6089 dm3 × mol−1 × cm−1 for λ = 289 nm and both 7800 and 8021 dm3 × mol−1 × cm−1 for λ = 301 nm. The obtained results indicate that amount of Fmoc groups present on TiO2@SiO2–(CH2)3–NH2 was calculated at 6 to 9 µmol/g. Furthermore, all measurements were compared with Fmoc–Gly–OH used as the model sample.

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Adsorption mechanisms of l-Glutathione on Au and controlled nano-patterning through Dip Pen Nanolithography

Cited by 25 publications

References 61 publications

Electrospun Zein Nanofiber as a Green and Recyclable Adsorbent for the Removal of Reactive Black 5 from the Aqueous Phase

Electrospun Zein Nanofiber as a Green and Recyclable Adsorbent for the Removal of Reactive Black 5 from the Aqueous Phase

Pathways for Oral and Rectal Delivery of Gold Nanoparticles (1.7 nm) and Gold Nanoclusters into the Colon: Enteric-Coated Capsules and Suppositories

Efficient Method for the Concentration Determination of Fmoc Groups Incorporated in the Core-Shell Materials by Fmoc–Glycine

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