Rajeev Kumar's research while affiliated with Panjab University and other places

Publications (20)

Article
A convenient methodology, which efficiently promoted one-pot synthesis of 3-pyridylchalcogen (Se, Te) compounds, has been developed. Under non-cryogenic conditions, 3,3'-dipyridyl diselenide/ditelluride and other unsymmetrical derivatives were prepared by the reaction of 3-bromopyridine with the isopropyl magnesium chloride (i-PrMgCl) followed by t...
Article
This review summarizes advancement in the field of pyridyl-based organochalcogen ligands in terms of their coordination behavior and biological applications. Pyridylchalcogen chemistry is well researched with reference to various technological applications but the targeted biological applications of this class of high utility ligands have not been...
Chapter
Monoaromatic hydrocarbons, polyaromatic hydrocarbons, volatile organic compounds (VOCs), heavy metals, inorganic salts, particular matters are the main forms of environmental pollution. Hydrocarbons (monoaromatic and polyaromatic) are of special concerns because some of them are highly toxic and persistent pollutants which threaten all life forms o...
Article
In recent years, there is significant growth in the bacterial resistance to various classic antibiotics. This has opened and enhanced the field of metal nanoparticles and antibiotic-metal nanoparticle complex. This research was designed to load a glycopeptide antibiotic named vancomycin on citrate-capped silver nanoparticles to enhance its antibact...
Article
Copper oxide (CuO) nanomaterials (NMs) of different size and morphology were synthesized by Chemical precipitation, Microwave irradiation and Hydrothermal method and characterized by TEM, BET, FTIR, XRD and EDX analysis. As synthesized CuO NMs were utilized for elimination of harmful dyes viz. Direct Red 81 (DR-81) and Coomassie Brilliant blue R-25...
Article
The utilization of selenium nanomaterials (Se Nps) in material and biological science is quickly growing, crafting an imperative need for toxicological evaluation of the exposure prospective and environmental consequences of Se Nps. The combination of quantitative multi-assay approach into environmental toxicological analysis has provided novel opp...
Article
This manuscript represents the synthesis of silica nanoparticles modified with four different types of cationic surfactants. The surfactant capped nanoparticles have better control over the size of silica nanoparticles. The as formed as model nanomaterials were used for the removal of naphthalene, a simple white crystalline polycyclic aromatic hydr...
Chapter
Hydrocarbon contamination of soil and water is increasing day by day around the world. Remediation of these contaminated sites using microorganisms (bioremediation) is the most efficient and environment-friendly method. Bioremediation is executed either on the site of contamination known as in situ or off the site of contamination known as ex situ....
Chapter
Full-text available
Oil spills are always harmful, whether accidental or deliberate as it contains hydrocarbons which are carcinogenic and also cause great damage to marine ecosystem disturbing its food chain and hence a threat to entire marine community. Many chemical and physical methods are used to remove the spilled oil of ocean floor, each having some drawbacks....
Article
Full-text available
p>Physiological studies pertaining to the effect of physical factors, carbon and nitrogen requirement of Phlebiopsis gigantea were conducted to know its behaviour in vitro . These studies have revealed interesting results regarding its growth and reproduction behaviour. The best medium for the optimum growth is Glucose-peptone medium. The optimum t...
Chapter
Full-text available
Since the onset of industrial revolution is up till the recent surge in technological processes, environmental pollution has grown at an alarming rate causing distress to living beings and irreplaceable damage to the earth. With the recognition of the severity of this environmental damage and increase in interest of using technological advancement,...
Article
One step green synthesis of silver nanoparticles (AgNPs) from silver nitrate (AgNO3) using Leucaena leucocephala seeds extract as the reducing agent at room temperature was performed. The bioreduced NPs were characterized by UV-vis spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM), scanning electron microscopy (SE...
Article
Full-text available
The current work emphasises on the nanoscale surface designing of Cerium oxide (CeO2) nanoparticles in surfactant media. The structural properties of surfactant functionalized nanoparticles were characterized by using UV-vis, PL, FTIR, XRD, TEM, DLS and DSC. The comparative effect of surfactants in relation with head groups and counterions over the...
Article
A number of novel and synthetically important pyridyl/naphthyl/(diphenyl)methylseleno substituted alkanoic acids (20–25) have been synthesized using an efficient and operationally simple strategy. Starting substrates, ethyl pyridyl/naphthyl/(diphenyl)methylseleno substituted alkanoates (8–13) were easily prepared by treatment of ethyl chloroalkanoa...
Article
Synthesis and characterization of 5,5′-dibromo-2,2′-dipyridyl disulfide and some of its derivatives under mild reaction conditions is described. A series of some novel synthetically important symmetrical/unsymmetrical bromo substituted pyridyl alkyl/aryl sulfur compounds have been easily synthesized from a variety of alkyl halides, using NaBH4 in m...
Article
A variety of hitherto unknown symmetrical and unsymmetrical pyrimidyl chalcogen compounds have been synthesized and characterized by elemental analysis using various spectroscopic techniques viz. NMR H, C, Se and infrared. Two different methodologies were employed. The first method involves the use of hydrazine hydrate as reducing agent to generate...
Article
An efficient protocol for the synthesis of novel hitherto unknown substituted and unsubstituted phenyl pyridyl selenides from dipyridyl/diphenyl diselenides and phenyl/pyridyl halides in the presence of copper catalysed system, Cu2O/Mg/bpy is being presented. All the synthesized selenides are either light yellow coloured liquids or low melting soli...
Article
Full-text available
The effect of the addition of the organic chalcogen (Py2Se2) on the micellization of Sodium dodecyl sulfate (SDS) in aqueous solution was studied using spectroscopic and electrical conductivity techniques. UV–vis spectroscopy, nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR) were employed to get information regard...
Article
A number of novel and synthetically important symmetrical and unsymmetrical diarylmethyl sulfur and selenium compounds have been synthesized and characterized with the help of elemental analysis and various spectroscopic techniques. The methodology employs sodium borohydride in ethanol–DMF for E–E bond cleavage (where E=S, Se) at room temperature a...

Citations

... [2-phenyl-1,2-benzisoselazol-3(2H)-one] is an organoselenium compound, which is most widely studied as a GP x mimetic and has also been found to possess antiviral properties against a number of viruses such as human immunodeficiency virus type 1 (HIV-1), hepatitis C virus (HCV), influenza A virus, Zika virus, herpes simplex virus type 1 (HSV-1), and coxsackie virus (Wójtowicz et al., 2004;Mukherjee et al., 2014;Singh et al., 2015;Oostwoud et al., 2016;Sharma et al., 2017a;Sands and Back., 2018;Simanjuntak et al., 2018;Zhang J et al., 2020). In addition to ebselen, researchers have been exploring the other selenium compounds for various biological activities (Dhau et al., 2014b;Sharma et al., 2017b;Dhau et al., 2021;Kumar et al., 2022). Amporndanai et al. (2021)investigated the binding modes of ebselen derivatives in M pro through high-resolution cocrystallography and further explored their chemical reactivity using spectroscopic techniques. ...
... In the last two decades, biological activities of selenium nanoparticles (Nano-Se) toward various diseases have been extensively studied (Figure 1), which has transformed the Se nanoparticle chemistry as a major branch of study in nanotechnology (Khurana et al.;2019;Shi et al., 2021;Bisht et al., 2022). The capabilities of Se-containing species to act as an antiviral in nature make it notable and potentially useful in the current COVID-19 pandemic (Kieliszek, 2022;Singh et al., 2022). In the case of SARS-CoV-2, Se deficiency is related to increased susceptibility to infections (Khatiwada and Subedi 2021;Majeed et al., 2022). ...
... On our planet, water is the most crucial and abundant natural resource for life [1]. However, accessible clean water for our consumption is less than 1%. ...
... The results indicate that The soil was moderately acidic to weakly alkaline, and the results show that there are significant differences between the average levels of P on the one hand and the average levels of T on the other hand. As the pH is one of the factors that determine the proliferation of disintegrated microorganisms of oil residues, it is also one of the main environmental factors that affect the bioavailability of pollutants, the availability of other nutrients and the activity of biological processes, and thus the overall biological treatment method from polluted crude oil to soil and water (Kumar et al.,2018). ...
... They increase and act as great decomposers in burrowing organic matter, such as trees, and inorganic materials, such as rocks and mine wastes [15]. In the 1990s, a mycologist named Paul Edward Stamets developed a strain of oyster mushrooms with enzymes called peroxidases [16], which can break down hydrocarbon molecules in oil-contaminated soil or oil dirt areas of a mine. This is one of the best decomposers for oil because oil-contaminated sites can have toxic effects on the environment. ...
... Furthermore, Ag nanomaterials have the potential to overcome the complication of bacterial resistance which devoted by commonly used antibiotics in combating bacterial infection for biomedical application [3][4][5]. The effectiveness of Ag nanomaterials on a broad spectrum of pathogenic bacteria and fungi has been verified in recent studies [6][7][8]. The formation and release of Ag þ and Ag 2þ ions on Ag nanomaterials surface under an aqueous environment were considered as the main pathway to produce biocidal effect [6]. ...
... Toxicological studies have shown that small selenium nanoparticles are characterized by a larger surface area and those particle numbers per unit mass can induce harmful respiratory damage and inflammation. Larger SeNPs (about 100 nm) can be taken up by macrophages, and their aggregation can reduce the toxicity of nanoparticles [56]. It is known that in response to various pathological stimuli, astrocytes can undergo changes in transcriptional regulation, as well as biochemical, morphological, metabolic, and physiological remodeling, characterized by the general name "reactive astrogliosis" [57,58]. ...
... Functionalization of the parent adsorbent surface involves incorporating new chemical moieties, often other organic functional groups (Jainae et al. 2010;Xu et al. 2013;Bhattacharjee and Chakraborty 2014;Awual and Hasan 2014;Zhang et al. 2015;Medeiros Borsagli et al. 2015;Gong et al. 2016;Ihsanullah et al. 2016;Tan et al. 2018b;Peng et al. 2018;Chaudhary et al. 2018;Eftekhari-Sis et al. 2018;Fatima et al. 2019;Youssef et al. 2019;Xiong et al. 2019;Azqhandi et al. 2019;Li et al. 2019bTaleb et al. 2019;Liu et al. 2020c;Mahmoud et al. 2020;Shahzad et al. 2020;Bo et al. 2020). These groups will generate significantly more specific and active surface adsorption sites. ...
... Conventional sensors can identify the pollutants in biological samples, air, water, soil, and chemical compounds. They are also capable of detecting industrial products at low levels up to ppm and ppb (Kumar et al. 2017). ...