DFT of 5-Fluoro-2-Oxo-1H-Pyrazine-3-Carboxamide (OPC) Adsorption, Spectroscopic, Solvent Effect, and SERS Analysis

DFT study of pure and Pt-decorated BN nanocone as a nanocarrier for nitrosourea anticancer drug

In this current study, the effectiveness of both the Pt-coated BN nanocone (BNC) and pristine in detecting and drug delivery of nitrosourea anticancer (NU) drugs were analyzed using periodic DFT. Research examines how the drug molecules adsorb and affect structural and electronic features of substrate. Analysis of interaction between NU and pure BNC surface, as suggested by the adsorption energy, reveals a relatively weak interaction. The adsorption energies in gas and water phases for the most stable NU@Pt-BNC complex are -1.88 eV and -2.89 eV, respectively. Study also investigated drug's ability to dissolve, along with that of surface and complexes, in an aqueous solvent. Additionally, simulations were conducted to model release of the drug from the substrate in close proximity to target cells within an acidic environment. A Pt-BNC substrate could be suggested as a promising carrier and sensor for NU anticancer medications.

Cheminformatics-based design and biomedical applications of a new Hydroxyphenylcalix[4] resorcinarene as anti-cancer agent

The distinct conformational characteristics, functionality, affordability, low toxicity, and usefulness make calixarene-based compounds a promising treatment option for cancer. The aim of the present study is to synthesize a new calixarene-based compound and assess of its anticancer potential on some human cancer cells. The synthesized C-4-Hydroxyphenylcalix[4] resorcinarene (HPCR) was characterized by several spectroscopic techniques such as 1HNMR, 13CNMR, and X-ray crystallographic analysis to confirm its purity and identity. IC50 values were identified for cancer cell lines (U-87, MCF-7, A549) and human dermal fibroblasts cell line (HDF) after treatment with HPCR and the standard drug Cisplatin. A significant selective growth inhibitory activity against U-87 and A549 cell lines was obtained at an HPCR concentration of 100 μM. The MOE docking module (version 2015) was utilized to assess the extent of inhibition for HPCR compound against four cancer-related proteins (3RJ3, 7AXD, 6DUK, and 1CGL).

SERS analysis, DFT, and solution effects regarding the structural and optical characteristics of folic acid biomolecule adsorbed on a Cu3 metal cluster

The optical characteristics of folic acid (ABP) and metal clusters of copper (Cu3) at various locations were investigated by means of density functional theory (DFT) computations. Mulliken charge analysis and molecular electrostatic potential (MEP) surface show how charge moves from Cu3 to ABP through the various groups. The peak in the UV-Vis spectra of ABP-Cu3 is caused by bonding and anti-bonding orbitals. In both vacuum and aqueous conditions, the polarizability values of ABP-Cu3 cluster are significantly higher than those of pure ABP, indicating a possible enhancement of the nonlinear optical (NLO) effect. Our research investigates the possibility of using ABP adsorbed metal clusters for NLO materials. Surface enhanced Raman scattering (SERS) in the ABP adsorbed metal clusters enhances the vibrational modes of ABP. Adsorption energies are found to be in the range -17.08 to -58.52 kcal/mol in vacuum and -53.34 to -93.44 kcal/mol in aqueous medium for the different configurations for ABP-Cu3. It indicates that metal clusters adsorbed by ABP are stable in the aqueous media. Experimental IR and UV-Vis of ABP is in agreement with theoretically predicted ones.

Molecular Docking Studies of Boron‐Containing Compounds as Dual Inhibitors of SARS‐Cov‐2 Spike Receptor Binding Domain/ACE2 Complex and Main Protease and ADMET Investigations

The severe acute respiratory syndrome SARS‐CoV‐2 is the causative agent of COVID‐19. Preventing binding of SARS‐CoV‐2 Spike glycoprotein to human ACE2 enzyme and inhibition of MPRO enzyme are still attractive drug targets for treatment of COVID‐19 infection. Boron atom‐containing compounds show anticancer, antibacterial, antiviral, antifungal, antiparasitic, anti‐inflammatory, antituberculosis, anti‐dermatophytic and anti‐fertility activities. In the current study, the ADMET properties of ligands were calculated by the aim of SwissADME and pkCSM pharmacokinetics web tools. The results revealed that the ligands meet drug‐likeness properties. Furthermore, we have performed molecular docking study of boron containing dioxaborepine and oxadiazaborole derivatives to investigate binding properties of ligands against SARS‐CoV‐2 Spike glycoprotein/ACE2 complex and inhibition of MPRO enzyme. Through the ligands a derivative of dioxaborepine showed best binding score against SARS‐CoV‐2 Spike glycoprotein/ACE2 complex with a binding score of −8.93 kcal/mol and a oxadiazaborole derivative exhibited a binding score value of −8.36 kcal which is the best binding ligand to the MPRO enzyme binding site. The analysis of binding poses of ligands and ligand‐residue interactions of the systems revealed that dioxaborepines and oxadiazaboroles could have block binding of Spike glycoprotein to human ACE2 enzyme and could have inhibition effects on MPRO enzyme.

DFT analysis on the adsorption of melamine in Ga12-N12/P12 nanocages: solvent effects, SERS analysis, reactivity properties

Due to its negative effects on people, melamine contamination in food products are detected and filtered. Amongst several sensory schemes for the screening of melamine poisoning, one of the most promising techniques is the use of nanomaterial based sensing for real time applicability in industries. In the current work, we have looked into the way melamine binds to Ga12-N12/P12 nanocages. Surface-enhanced Raman scattering (SERS), a successful spectroscopic technique is used to monitor melamine. Density functional theoretical (DFT) computations were used to study the sensing properties of melamine (Me) with Ga12-N12/P12 nanocages. Reactivity and Mulliken charge analyses show charge transfer from melamine to nanocage. Me-Ga12-N12 and Me-Ga12P12 clusters have adsorption energies of -47.54 and -33.12 kcal/mol, respectively. All nanocage-Me systems have a significant increase in polarizability. The electron densities revealed non-covalent interactions in the adsorbed systems. All adsorption energies in aqueous media are negative, indicating an attractive and exothermic reaction, with maximum value in water for Me-Ga12N12 and in acetone for Me-Ga12P12. Evidence of SERS is observed due to the enhancement of different vibrational modes.Communicated by Ramaswamy H. Sarma.