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Thokchom Bothe,Bhavi Santosh Mallikarjun,Abbigeri Megha B.,Shettar Arun K.,Yarajarla Ramesh Babu 한국탄소학회 2023 Carbon Letters Vol.33 No.4
Medicinal plant-derived carbon dots are eco-friendly and possess therapeutic properties. Among the medicinal plants studied throughout the world, Centella asiatica (L.) Urb. is known for its medicinal values, especially its neuroceutical and cogniceutical properties. This work discusses the green synthesis of carbon dots (CDs) using C. asiatica leaves as the carbon source via fast and cost-effective microwave-assisted method, and its physico-chemical characterization via UV–visible, fluorescence and FTIR spectrometry, XRD, SEM, AFM, TEM, SAED, EDX and zeta potential analyses. The study revealed quasi-spherical CDs having size ~ 3–6 nm, polycrystalline nature, and presence of various functional groups like –COOH, –H, =CH2 and C–O–C with UV absorption peaks at 213 and 322 nm. Interestingly, the C. asiatica-derived CDs exhibited blue fluorescence under UV with maximum emission wavelength of 460 nm when excited at 400 nm. Further, these CDs were evaluated for their biological applications, which uncovered their potential in therapeutics such as antimicrobial properties against both Gram-positive and Gram-negative bacteria at a dose of 10 μg, strong antioxidant activity with IC50 values of 165.28 and 128.48 μg mL−1 in DPPH and H2O2 assays, respectively, and profound anti-inflammatory activity with IC50 value of 106.20 μg mL−1 in protein denaturation assay. The CDs were also assessed for cytotoxicity using whole blood cells and were found to be safe for in vitro administration. Thus, the C. asiatica-derived CDs can be exploited for their potent biomedicinal properties.
Thokchom, B.,Qiu, P.,Cui, M.,Park, B.,Pandit, A.B.,Khim, J. Elsevier Science 2017 Ultrasonics sonochemistry Vol.34 No.-
In the present research, the degradation of an emerging pharmaceutical micro-pollutant, Ibuprofen (IBP) by using PdΦe<SUB>3</SUB>O<SUB>4</SUB> and a hybrid sono-electrolytical (US/EC) treatment system has been demonstrated for the first time. The magnetically separable nanocomposite, PdΦe<SUB>3</SUB>O<SUB>4</SUB> catalyst was synthesized following co-precipitation method to enhance the efficiency of US/EC system. The synthesized catalyst showed a strong reusable property even after applying for five times and in all the five cases, 100% degradation of IBP was maintained. It not only enhanced the IBP degradation rate, but also reduced the energy consumption of the system by ~35%. Its strong magnetization value of 64.27emug<SUP>-1</SUP> made it easily separable. Hence, a comprehensive knowledge on the application of combined energy based US/EC system and magnetically separable multifunctional catalysts for degradation of intractable pollutants like Ibuprofen was achieved, assuring that US/EC can be an effective option for IBP treatment.
A review on sonoelectrochemical technology as an upcoming alternative for pollutant degradation
Thokchom, B.,Pandit, A.B.,Qiu, P.,Park, B.,Choi, J.,Khim, J. Elsevier Science 2015 Ultrasonics sonochemistry Vol.27 No.-
Sonoelectrochemical process has emerged as a novel integrated technology for various applications starting from sonoelectroplating till the remediation of a wide range of contaminants. Although a promising new technology, the application of sonoelectrochemical technology for pollutant degradation are mostly on a laboratory scale, utilizing the conventional reactor configuration of the electrolytic vessel and ultrasonic horns dipped in it. This type of configuration has been believed to be responsible for its sluggish evolution with lower reproducibility, scale-up and design aspects. To achieve a major turn with an enhanced synergy, refinements in the form of optimizing the co-ordination of the governing parameters of both the technologies (e.g., power, frequency, liquid height, electrode material, electrode size, electrode gap, applied voltage, current density etc.) have been validated. Besides, in order to supplement knowledge in the already existing pool, rigorous research on the past and present status has been done. Challenges were also identified and to overcome them, critical discussions covering an overview of the progressive developments on combining the two technologies and its major applications on pollutant degradation were conducted.
Thokchom Prasanta Singh,Ruhima Khan,Young Ri Noh,이상경,Okram Mukherjee Singh 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
A series of bis and tris-indolylketones and meridianin alkaloids are prepared by one pot Michael reaction of indole and ketene S,S-acetals under solvent-free condition using mild Lewis acid InCl3.
Thokchom, Ashish Kumar,Zhou, Qitao,Kim, Dong-Joo,Ha, Dogyeong,Kim, Taesung Elsevier Sequoia 2017 Sensors and actuators. B Chemical Vol.252 No.-
<P><B>Abstract</B></P> <P>The self-assembly and deposition mechanisms of nanoparticles in droplets on a substrate are of significant importance in many inkjet printing-based industrial applications such as microelectronics, display systems, and paint manufacturing. However, a comprehensive investigation into the velocity field of fluid and its accompanying particle transport behavior in injected droplets undergoing immediate evaporation has not been conducted. In this study, we describe the underlying mechanisms of the self-assembly and deposition behavior of nanoparticles in inkjet-printed, evaporating droplets by visualizing the internal fluid flows. We additionally characterize the relationship between the internal fluid flows and nanoparticle patterns by changing not only the wettability and temperature of the substrate, but also the chemical composition of nanoparticle suspensions. We verify that Marangoni flow generated on a hydrophobic PDMS substrate with a contact angle (CA) of >90° helps the formation of dome-shaped nanoparticle structures, while radially outward flow generated on a hydrophilic glass substrate with a CA of <10° produces either mono-layered and flat, or ring-shaped nanoparticle structures, depending on the number density of the suspension. The presented characterization results provide not only valuable mechanistic insights, but also practical guidelines for inkjet printing-based nanoparticle applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Marangoni flow on a hydrophobic substrate helps the formation of dome-shaped nanoparticle structures. </LI> <LI> Radially outward flow on a hydrophilic substrate produces either flat and mono-layered or ring-shaped nanoparticle structures. </LI> <LI> The nanoparticle structures on a hydrophilic substrate depend on the number density of the suspension. </LI> <LI> The substrate temperature affects the self-assembly and deposition mechanism of nanoparticles in evaporating droplets. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This study describes the mechanism of the self-assembly and deposition of nanoparticles in droplets that are inkjet-injected and immediately evaporate on various substrates. The resulting nanostructures and patterns directly affect structural colors showing high potential for anti-counterfeit applications.</P> <P>[DISPLAY OMISSION]</P>
Sharmila Thokchom,Santa Ram Joshi 한국미생물학회 2012 The journal of microbiology Vol.50 No.3
The present investigation was conducted to assess lactic acid bacteria present in traditionally fermented food of ethnic tribes in India for probiotic properties, antibacterial activity, and antibiotic tolerance behavior. Enterococcus sp., Lactobacillus sp., and Lactococcus sp. showed antibacterial activity against Bacillus cereus MTCC 430, Staphylococcus aureus subsp. aureus MTCC 740, and Salmonella enterica ser. paratyphi A MTCC 735. Lactococcus sp. and Lactobacillus sp. could tolerate acidic conditions (pH 2) and high bile salt concentration (4000 ppm). The lactic microflora were found to be sensitive to most common antibiotics, except for cloxacillin (5 μg), cephalexin (30 μg), and cephalothin (30 μg).
Sharmila Thokchom,Santa Ram Joshi 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.5
Fibrinolytic enzyme producing microorganismswith high fibrin specificity were screened, including lacticacid bacteria from fermented soybean foods of North-EastIndia. A total of 5 isolates, including Lactococcus lactis(FS1), Vagococcus lutrae (FS6), Vagococcus fluvialis(FS7), Weissella thailandensis (FS8), and Bacillus methylotrophicus(FS19) were found to hydrolyze fibrin directly ona plasminogen-free fibrin plate. Hydrolysis of fibrin wasstronger with crude enzymes than with plasmin, indicatinghigh fibrin specificity. The molecular weights of theseenzymes, as determined by SDS-PAGE, ranged from 35 to116 kDa.
Singh, Thokchom Prasanta,Khan, Ruhima,Noh, Young Ri,Lee, Sang-Gyeong,Singh, Okram Mukherjee Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
A series of bis and tris-indolylketones and meridianin alkaloids are prepared by one pot Michael reaction of indole and ketene S,S-acetals under solvent-free condition using mild Lewis acid $InCl_3$.