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In vitro Antioxidant Activity of Ethanolic Extract of Chlorophytum borivilianum
R. Govindarajan1,,N. Sreevidya1,,M. Vijayakumar1,,M. Thakur2,,V.K. Dixit2,,S. Mehrotra*1,,P. Pushpangadan1 한국생약학회 2005 Natural Product Sciences Vol.11 No.3
Chlorophytum borivilianum Baker (Antharicaceae) comonly referred as ‘Safed Musli’ has beenwidely used in the Indian traditional systems of medicine to treat various diseases like rheumatism apart fromaphordisiac properties. C. borivilianum was screened for the first time to determine its antioxidant activity,isolation of the sapogenins and standardization of the isolated sapogenin fraction using HPTLC. Potent antioxidantactivity of ethanolic extract was found by their ability to scavenge DPPH (84.51%), hydroxyl radical (48.95 %),feryl bi-pyridyl complex (84.53%) along with the inhibition of lipid peroxidation (67.17%) at 100g/mlconcentration. The ethanolic extract also exhibited significant inhibition of superoxide anion radical generated byplant in the traditional system especially its use as a Rasayana drug.
Swapnil Singh THAKUR(Swapnil Singh THAKUR ),Rahul Singh GAUTAM(Rahul Singh GAUTAM ),Ajay Kumar YADAV(Ajay Kumar YADAV ),Hitesh PATOLE(Hitesh PATOLE ),Aashi RAWAL(Aashi RAWAL ),Shailesh RASTOGI(Shailes 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.2
The goal of this study is to understand how financial inclusion (FI) as influenced by Internet subscribers in India, affects India’s Sustainable Development Goals (SDG). This study makes use of secondary data that was collected from 16 Indian states and one Union Territory between the fiscal years of 2018 and 2020. The goal of this study has been investigated using panel data regression analysis (PDR). And the study’s findings indicate that wages received through MNREGA accounts and post office operating accounts under the supervision of Internet subscribers have a significant negative impact on India’s SDGs, demonstrating how financial inclusion is harming the country’s efforts to achieve sustainable development. This study suggests that it is important to pay attention to rural areas’ access to the digital environment and their degree of digital literacy. These findings imply that improving the MGNREGA program and employees’ pay might help the government alleviate poverty in India. Financial inclusion also depends heavily on financial literacy. The government should improve its digital infrastructure in rural and urban areas so that people there may better understand and utilize it given that it promotes financial inclusion, digitalization, economic advancement, rural development, and poverty reduction.
Thakur, Preeti,Chahar, Deepika,Thakur, Atul Techno-Press 2022 Advances in nano research Vol.12 No.4
Nickel substituted cobalt-zinc ferrite nanoparticles with composition Co<sub>0.5</sub>Zn<sub>0.5</sub>Ni<sub>x</sub>Fe<sub>2-x</sub>O<sub>4</sub> (x = 0.25, 0.5, 0.75, 1.0) were synthesized using a wet chemical method named citrate precursor method. Various characterizations of the prepared nanoferrites were done using X-ray powder diffractometry (XRD), Scanning electron microscopy (SEM), UV visible spectroscopy and Fourier transform spectroscopy technique (FT-IR). XRD confirmed the formation of cubic spinel structure of the samples with single phase having one characteristic peak at (311). The value of optical band gap (E<sub>g</sub>) was found to decrease with Ni substitution and have values in the range 2.30eV to 1.69eV. A Fenton-type system was created by photocatalytic activity using source of visible light for removal of methylene blue dye. Observations revealed increase in the degradation of methylene blue dye with increasing nickel content in the samples. The degradation percentage was increased from 77.32% for x = 0.25 to 90.16% for x = 1.0 in one hour under the irradiation of visible light. Also, the degradation process was found to have pseudo first order kinetics model. Hence, it can be observed that synthesized nickel doped cobalt-zinc ferrites have good capability for water purification and its degradation efficiency enhanced with increase in nickel concentration.
Thakur, Atul,Punia, Pinki,Dhar, Rakesh,Aggarwal, R.K.,Thakur, Preeti Techno-Press 2022 Advances in nano research Vol.12 No.5
The potentials of Ni<sub>x</sub>Zn<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) nanoadsorbents were investigated for removal of Cd and Cr from contaminated water from an electroplating industry in Himachal Pradesh, India. Optimal values were recorded under batch adsorption experiments performed to remove dissolved heavy metal ions from industrial wastewater. The specific surface area (SSA) of nanoadsorbents perceived to vary in a range 35.75-45.29 cm<sup>2</sup>/g and was calculated from the XRD data. The influence of two operating parameters, contact time and dopant (Ni) concentration was also investigated at pH ~7 with optimum dosage. Kinetic studies were conducted within a time range of 2-10 min with rapid adsorption of cadmium and chromium ions onto Ni<sub>0.2</sub>Zn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub> nanoadsorbents. Pseudo-second-order kinetic model was observed to be well fitted with the adsorption data that confirmed the only existence of chemisorption throughout the adsorption process. The maximum adsorption efficiency values observed for Cd and Cr were 51.4 mg/g and 40.12 mg/g, respectively for different compositions of prepared series of nanoadsorbents. The removal percentage of Cd and Cr was found to vary in a range of 47.7%-95.25% and 21%-50% respectively. The prepared series of nanoferrite found to be suitable enough for adsorption of both heavy metal ions.
Thakur, Shikha,Sharma, Nirmal Kant,Thakur, Neerja,Bhalla, Tek Chand The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.2
In this study, the extracellular metalloprotease from Serratia marcescens PPB-26 was purified to homogeneity via ethanol fractionation and DEAE-cellulose column chromatography. Thus, a 3.8-fold purification was achieved with a 20% yield and specific activity of 76.2 U/mg. The purified protease was a 50-kDa monomer whose optimum pH and temperature for activity were 7.5 and $30^{\circ}C$ respectively; however, it was found to remain active in the 5-9 pH range and up to $40^{\circ}C$ for 6 h. The protease had a half-life of 15 days at $4^{\circ}C$, an optimum reaction time of 10 min, and an optimum substrate (casein) concentration of 0.25%. Furthermore, the Michaelis constant ($K_m$) and reaction velocity ($V_{max}$) of the protease were calculated to be 0.28% and $111.11{\mu}moles/(min{\cdot}mg)^{-1}$, respectively. The protease was stable when subjected to metal ions (2 mM), showing increased activity with most (especially $CoCl_2$ and $MgSO_4$ (30.54% increase)). It was also stable when exposed to oxidizing agents, bleaching agents, and detergents (5% v/v for 60 min). It retained 93% of its activity in non-ionic detergents (Tween-20, Tween-80, and Triton X-100). Moreover, wash performance analysis in commercial detergents (Ariel and Tide) showed that not only was the protease capable of protein stain removal, but also reduced cleaning time by 80% when added to detergents. Thus, the Serratia marcescens PPB-26 metalloprotease appears to be a promising new candidate as a laundry additive in the detergent industry.
Orbital anisotropy in SnO<sub>2</sub> thin films and its modification by swift heavy ion irradiation
Thakur, H.,Kumar, R.,Thakur, P.,Brookes, N.B.,Sharma, K.K.,Singh, A.P.,Kumar, Y.,Gautam, S.,Chae, K.H. North Holland ; Elsevier Science Ltd 2011 Chemical physics letters Vol.511 No.4
We report on the observation of a strong orbital anisotropy in the orthorhombic phase of SnO<SUB>2</SUB> thin films and its modification by swift heavy ion (SHI) irradiation. Structural investigations along with the Raman spectroscopy show a significant distortion of the SnO<SUB>6</SUB> octahedra after SHI irradiation. The X-ray absorption and X-ray linear dichroism (XLD) experiments provide the direct evidences of change in orbital anisotropy/electronic structure due to orbital reconstruction in the SnO<SUB>2</SUB> lattice after irradiation. The XLD measurements at the O K edge confirm the deterioration in the SnO<SUB>6</SUB> octahedra due to controlled structural disorder induced by SHI irradiation.
On the Optical Properties of Ag+15 Ion-beam-irradiated TiO2 and SnO2 Thin Films
Hardeep Thakur,K. K. Sharma,Ravi Kumar,Pardeep Thakur,Yogesh Kumar,Abhinav Pratap Singh,Sanjeev Gautam,채근화 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10
The effects of 200 MeV Ag<sup>+15</sup> ion irradiation on the optical properties of TiO<sub>2</sub> and SnO<sub>2</sub> thin films prepared by RF magnetron sputtering technique were investigated. These films were characterized by the UV-vis spectroscopy and it was observed that with increase in irradiation fluence the transmittance for the TiO<sub>2</sub> films systematically increases while that for SnO<sub>2</sub> decreases. Absorption spectra of the irradiated samples showed a minor changes in indirect bandgap from 3.44 to 3.59 eV for TiO<sub>2</sub> while that for SnO<sub>2</sub> significant modifications in the direct bandgap from 3.92 to 3.6 eV were observed on increasing irradiation fluence. The observed modifications in the optical properties of both TiO<sub>2</sub> and SnO<sub>2</sub> systems with irradiation can be attributed to controlled structural disorder/defects in the system.
Shikha Thakur,Nirmal Kant Sharma,Neerja Thakur,Tek Chand Bhalla* 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.2
In this study, the extracellular metalloprotease from Serratia marcescens PPB-26 was purified to homogeneity via ethanol fractionation and DEAE-cellulose column chromatography. Thus, a 3.8-fold purification was achieved with a 20% yield and specific activity of 76.2 U/mg. The purified protease was a 50-kDa monomer whose optimum pH and temperature for activity were 7.5 and 30℃ respectively; however, it was found to remain active in the 5−9 pH range and up to 40℃ for 6 h. The protease had a half-life of 15 days at 4℃, an optimum reaction time of 10 min, and an optimum substrate (casein) concentration of 0.25%. Furthermore, the Michaelis constant (Km) and reaction velocity (Vmax) of the protease were calculated to be 0.28% and 111.11 μmoles/(min·mg)-1, respectively. The protease was stable when subjected to metal ions (2 mM), showing increased activity with most (especially CoCl2 and MgSO4 (30.54% increase)). It was also stable when exposed to oxidizing agents, bleaching agents, and detergents (5% v/v for 60 min). It retained 93% of its activity in non-ionic detergents (Tween-20, Tween-80, and Triton X-100). Moreover, wash performance analysis in commercial detergents (Ariel and Tide) showed that not only was the protease capable of protein stain removal, but also reduced cleaning time by 80% when added to detergents. Thus, the Serratia marcescens PPB-26 metalloprotease appears to be a promising new candidate as a laundry additive in the detergent industry.