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Senthilkumar

Bio: Senthilkumar is an academic researcher. The author has contributed to research in topics: Silver nanoparticle. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

Papers
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TL;DR: The spectral bio-diagnosis of normal human body saliva sample shows the following functional compounds and it is related to various proteins and enzymes as mentioned in this paper : the hydroxyl group is observed in the form of O-H at 3,305 cm−1, because of the presence of lipids, the functional group C-H is obtained from 2,928 to 2,856 cm− 1, due to the presence amide-I in the forms of C=N and C=C obtained at 1,658 cm−2, the proteins are exhibited.
Abstract: The spectral bio-diagnosis of normal human body saliva sample shows the following functional compounds and it is related to various proteins and enzymes. Because of the presence of water in the saliva sample, the hydroxyl group is observed in the form of O–H at 3,305 cm−1, because of the presence of lipids, the functional group C–H is obtained from 2,928 to 2,856 cm−1, due to the presence of amide-I in the form of C=N and C=C obtained at 1,658 cm−1, the proteins are exhibited. Due to the presence of aliphatic CH2, the Lipids, Adenine, Cytosine, Collagen are observed at 1,455 cm−1, because of the presence of Carbohydrates, Phospholipids, Nucleic acids, the functional groups C=O and P=O from 1,159 to 1,064 cm−1 are exhibited. Due to the presence of Phenylalanine, Tyrosine, Cystine and Hydroxyapatite C–C twist, C–C stretch, C–S stretch and PO42− are observed at 748 and 483 cm−1. Silver nanoparticle has attracted considerable interest due to their extensive applicability in various areas such as electronics, catalysis, chemistry, energy and medicine. To study the opto-electronics properties of the samples, it was mixed with silver nanoparticles and characterized.

5 citations


Cited by
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TL;DR: A cost effective and eco-friendly technique for green synthesis of silver nanoparticles from 1 mM AgNO3 solution through the extract of dried fig (Ficus carica L.) fruit as reducing as well as capping agent is described.

55 citations

Journal ArticleDOI
TL;DR: In this article, the use of Raman spectroscopy combined with saliva is presented as an exciting emerging spectroscopic-biofluid combination, and a review of current methods employed in such studies is presented.
Abstract: The use of Raman spectroscopy combined with saliva is an exciting emerging spectroscopy-biofluid combination. In this review, we summarize current methods employed in such studies, in particular th...

21 citations

Journal ArticleDOI
22 Jun 2020
TL;DR: Evidence is provided for eco-friendly biosynthesis of well-characterized AgNPs and their potential antibacterial as well as antifungal activity and effective antif fungus activity was observed towards pathogenic Candida spp.
Abstract: The present study described the extracellular synthesis of silver nanoparticles (AgNPs) using environmental bacterial isolate Citrobacter spp MS5 culture supernatant To our best knowledge, no previous study reported the biosynthesis of AgNPs using this bacterial isolate The biosynthesized AgNPs were characterized using different techniques like UV-Vis spectroscopy, fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with energy dispersive X-ray (EDX) The analysis of UV-Vis spectra revealed absorption maxima at 415 nm due to surface plasmon resonance (SPR) indicated the formation of AgNPs and FTIR spectrum confirmed the participation of proteins molecule in AgNPs synthesis XRD and EDX spectrum confirmed the metallic and crystalline nature of AgNPs TEM and SEM showed spherical nanoparticles with a size range of 5-15 nm The biosynthesized AgNPs showed effective independent as well as enhanced combined antibacterial activity against extended spectrum β-lactamase (ESBL) producing multidrug resistant Gram-negative bacteria Further, effective antifungal activity of AgNPs was observed towards pathogenic Candida spp The present study provides evidence for eco-friendly biosynthesis of well-characterized AgNPs and their potential antibacterial as well as antifungal activity

13 citations

Journal ArticleDOI
TL;DR: This study used the carbon dots solution for the laser ablation technique to fabricate silver nanoparticles to study the interaction of the prepared sample with fluoride and the intensity of the Raman signal decreased with the increasing concentration of fluoride.
Abstract: This study used the carbon dots solution for the laser ablation technique to fabricate silver nanoparticles. The ablation time range was from 5 min to 20 min. Analytical methods, including Fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy, transmission electron microscopy, and Raman spectroscopy were used to categorize the prepared samples. The UV-visible and z-scan techniques provided optical parameters such as linear and nonlinear refractive indices in the range of 1.56759 to 1.81288 and 7.3769 × 10−10 cm2 W−1 to 9.5269 × 10−10 cm2 W−1 and the nonlinear susceptibility was measured in the range of 5.46 × 10−8 to 6.97 × 10−8 esu. The thermal effusivity of prepared samples, which were measured using the photoacoustic technique, were in the range of 0.0941 W s1/2 cm−2 K−1 to 0.8491 W s1/2 cm−2 K−1. The interaction of the prepared sample with fluoride was investigated using a Raman spectrometer. Consequently, the intensity of the Raman signal decreased with the increasing concentration of fluoride, and the detection limit is about 0.1 ppm.
Journal ArticleDOI
TL;DR: In this paper , the root of a native weed plant Calotropis Procera was used to optimize the adsorption parameters like pH, contact time, sorbent dose, and initial adsorbate concentration.
Abstract: Iron is essential heavy metal in trace quantities, but its excessive concentration as Fe2+ is present in effluents from steel mills, iron ore mines, and metal processing industries, which pollute the groundwater. Among other conventional methods, sorption by natural biomass is a low-cost alternative for iron sequestration from an aqueous solution. The root of a native weed plant Calotropis Procera was used to optimize the adsorption parameters like pH, contact time, sorbent dose, and initial adsorbate concentration. Competitive adsorption of Fe2+ in the presence of cations (Ni2+, Cd2+, Cr3+, Zn2+, Ca2+, Mg2+, As3+) and anions (Cl-, SO42- , F-) was also studied. Batch adsorption studies were carried out to evaluate adsorption isotherm by Langmuir and Freundlich isotherm models. Leaching of biomass significantly improved iron uptake capacity from 15 mg g-1 to 80 mg g-1. The kinetics of the reaction was fast, with equilibrium conditions attaining in 30 minutes. FTIR study of the biomass revealed the presence of -COOH, -NH groups responsible for the metal binding mechanism. The biomass could be regenerated with 0.1 M HNO3 for further use. Iron removal from simulated acidic water was done under optimum conditions and absorbance was measured by a UV-Visible spectrophotometer.