Unnatural Amino Acid: 4-Aminopyrazolonyl Amino Acid Comprising Tri-Peptides Forms Organogel With Co-Solvent (EtOAc:Hexane)

Bollu, Amarnath; Giri, Prajnanandan; Dalabehera, Nihar Ranjan; Asmi, Asmita Rani; Sharma, Nagendra K.

doi:10.3389/fchem.2022.821971

Cited by 3 publications

(4 citation statements)

References 49 publications

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“…On the other hand, the peaks at ∼2θ = 18.54 and 18.7° reveal the interstrand and intersheet distance between two β-sheets (Figure b) . Additionally, the peaks at ∼2θ = 20.67° (with a d -spacing of 4.29 Å) and ∼2θ = 20.37° (with a d -spacing of 4.35 Å) for PBFY and Ni-PBFY-3, respectively, indicate the presence of hydrogen bonding between β-strands . The mechanical properties and viscoelastic behavior of the self-assembled boladipeptide were investigated by using rheological analysis.…”

Section: Resultsmentioning

confidence: 99%

“…30 Additionally, the peaks at ∼2θ = 20.67°(with a d-spacing of 4.29 Å) and ∼2θ = 20.37°(with a d-spacing of 4.35 Å) for PBFY and Ni-PBFY-3, respectively, indicate the presence of hydrogen bonding between β-strands. 31 The mechanical properties and viscoelastic behavior of the selfassembled boladipeptide were investigated by using rheological analysis. A frequency of 10 rad s −1 was used for the amplitude sweep assessment, and the strain was varied from 0.1 to 100%.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Sonication-Induced Boladipeptide-Based Metallogel as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Wagh,

Singh,

Kumar

et al. 2024

ACS Appl. Mater. Interfaces

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Bioinspired, self-assembled hybrid materials show great potential in the field of energy conversion. Here, we have prepared a sonication-induced boladipeptide (HO-YF-AA-FY-OH (PBFY); AA = Adipic acid, F = l-phenylalanine, and Y = l-tyrosine) and an anchored, self-assembled nickel-based coordinated polymeric nanohybrid hydrogel (Ni-PBFY). The morphological studies of hydrogels PBFY and Ni-PBFY exhibit nanofibrillar network structures. XPS analysis has been used to study the self-assembled coordinated polymeric hydrogel Ni-PBFY-3, with the aim of identifying its chemical makeup and electronic state. XANES and EXAFS analyses have been used to examine the local electronic structure and coordination environment of Ni-PBFY-3. The xerogel of Ni-PBFY was used to fabricate the electrodes and is utilized in the OER (oxygen evolution reaction). The native hydrogel (PBFY) contains a gelator boladipeptide of 15.33 mg (20 mmol L–1) in a final volume of 1 mL. The metallo-hydrogel (Ni-PBFY-3) is prepared by combining 15.33 mg (20 mmol L–1) of boladipeptide (PBFY) with 3 mg (13 mmol L–1) of NiCl2·6H2O metal in a final volume of 1 mL. It displays an ultralow Tafel slope of 74 mV dec–1 and a lower overpotential of 164 mV at a 10 mA cm–2 current density in a 1 M KOH electrolyte, compared to other electrocatalysts under the same experimental conditions. Furthermore, the Ni-PBFY-3 electrocatalyst has been witnessed to be highly stable during 100 h of chronopotentiometry performance. To explore the OER mechanism in an alkaline medium, a theoretical calculation was carried out by employing the first-principles-based density functional theory (DFT) method. The computed results obtained by the DFT method further confirm that the Ni-PBFY-3 electrocatalyst has a high intrinsic activity toward the OER, and the value of overpotential obtained from the present experiment agrees well with the computed value of the overpotential. The biomolecule-assisted electrocatalytic results provide a new approach for designing efficient electrocatalysts, which could have significant implications in the field of green energy conversion.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Sonication-Induced Boladipeptide-Based Metallogel as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Wagh,

Singh,

Kumar

et al. 2024

ACS Appl. Mater. Interfaces

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“…The presence of a peak at 4.2 Å is attributed to π-π stacking. The reflection peaks at 4.6 Å and 5.1 Å which appear in the XRD diffractogram of the M2 gelator correspond to hydrogen bonding between β-strands [29]. The XRD diffractograms of M3 and M4 show similar packing with slight differences.…”

Section: X-ray Powder Diffraction (Xrd)mentioning

confidence: 89%

“…The XRD diffractogram of the M1 self-assembled system shows a broad zone of different peak intensities with their d-spacing values between 2-6 Å associated with an amorphous phase [28]. Furthermore, the peaks of d-spacing at 4.9 Å and 10.54 Å are attributed to the inter-sheet distance or to antiparallel β-strands spacing [29]. The presence of a peak at 4.2 Å is attributed to π-π stacking.…”

Section: X-ray Powder Diffraction (Xrd)mentioning

confidence: 98%

Morphological Evaluation of Supramolecular Soft Materials Obtained through Co-Assembly Processes

Croitoriu,

Chiriac,

Rusu

et al. 2023

Gels

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Low-molecular-weight gelators (LMWGs) are compounds with an intrinsic tendency to self-assemble forming various supramolecular architectures via non-covalent interactions. Considering that the development of supramolecular assemblies through the synergy of molecules is not entirely understood at the molecular level, this study introduced a Fmoc-short peptide and four Fmoc-amino acids as building blocks for the self-assembly/co-assembly process. Hence, we investigated the formation of supramolecular gels starting from the molecular aggregation following two triggering approaches: solvent/co-solvent method and pH switch. The complex morphological analysis (POM, AFM, and STEM) offered an insight into the spontaneous formation of well-ordered nanoaggregates. Briefly, POM and AFM images demonstrated that self-assembled gels present various morphologies like dendrimer, spherulite, and vesicle, whereas all co-assembled supramolecular systems exhibit fibrillar morphologies as a result of the interaction between co-partners of each system. STEM study has confirmed that the molecules interact and join together, finally forming a fibrous network, an aspect seen in both self-assembled and co-assembled gels. XRD allowed the determination of the molecular arrangement. The study emphasized that the Fmoc motif protected the amino groups and facilitated gelation through additional π-π interactions.

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Effects of Counter-Anions for the Engineering of Metallo-Hydrogels for Electrocatalytic Hydrogen and Oxygen Evolution Reactions

Wagh,

Singh,

Das

2024

ACS Appl. Eng. Mater.

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. The metallo-hydrogels are prepared using a constant concentration of FF-AdiA-FF 18.37 mg (25 mM) with 3 mg of metal salt in a final volume of 1 mL. The outcomes of the hydrogen evolution reaction reveal that the gel-based FF-AdiA-FF-1 and FF-AdiA-FF-2 exhibit ultralow overpotentials of 110 and 118 mV to gain −10 mA cm −2 benchmarking current density in 0.5 M H 2 SO 4 compared to nongel electrocatalysts. Moreover, oxygen evolution reaction measurements exhibit that the FF-AdiA-FF-1 and FF-AdiA-FF-2 show very low overpotential, specifically 151 and 159 mV, respectively, to attain 10 mA cm −2 current density compared to nongel electrocatalysts in 1 M KOH. Furthermore, the chronopotentiometry results demonstrate that the gel-based electrocatalysts remain stable for up to 50 h. The higher-order self-assembled structures of the metallo-hydrogels offer a large surface area and more electrochemically active sites, which facilitate the smooth transport and intercalation/deintercalation of electrolyte ions. Ultimately, this work demonstrates a simple method for the fabrication of efficient bifunctional electrocatalysts based on supramolecular metallo-hydrogels these can be easily processed and functionalized using nonprecious transition metals.

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Unnatural Amino Acid: 4-Aminopyrazolonyl Amino Acid Comprising Tri-Peptides Forms Organogel With Co-Solvent (EtOAc:Hexane)

Cited by 3 publications

References 49 publications

Sonication-Induced Boladipeptide-Based Metallogel as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Sonication-Induced Boladipeptide-Based Metallogel as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Morphological Evaluation of Supramolecular Soft Materials Obtained through Co-Assembly Processes

Effects of Counter-Anions for the Engineering of Metallo-Hydrogels for Electrocatalytic Hydrogen and Oxygen Evolution Reactions

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