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Shajeelammal J, Mohammed S, Asok A, Shukla S. Removal of methylene blue and azo reactive dyes from aqueous solution and textile effluent via modified pulsed low-frequency ultrasound cavitation process. Environ Sci Pollut Res Int 2023; 30:29258-29280. [PMID: 36409415 DOI: 10.1007/s11356-022-24204-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
Organic dyes in the aqueous solutions and textile effluents cause severe environmental pollution due to their carcinogenic and mutagenic nature. Ultrasound (US) cavitation is one of the promising advanced oxidation processes (AOP) to remove the organic dyes from the aqueous solutions and textile effluents. Nevertheless, the conventional low-frequency US cavitation process exhibits very low efficiency in the dye removal process and demands effective modification to improve its performance. In this investigation, a conventional pulsed low-frequency (22 ± 2 kHz) US cavitation process has been modified by varying the US power (50-150 W), initial solution pH (2-10), and O2 flow rate (1-4 L min-1) to enhance the decomposition of cationic methylene blue (MB) dye in an aqueous solution. The operation of the classic Haber-Weiss reaction, both in the forward and backward directions, and the ozone effect have been observed, for the first time, under the modified US cavitation process, as confirmed via the radical trapping experiments. Moreover, the hydrothermally synthesized hydrogen titanate (H2Ti3O7) nanotubes (HTN) have been utilized as sonocatalyst, for the first time, for 100% dye removal, with effective regeneration obtained via an in-situ thermal activation of persulfate (PS, S2O82-). The most optimum values of US power, initial solution pH, O2 flow rate, HTN, and PS concentrations for 100% MB decomposition are observed to be 150 W, 2, 2 L min-1, 0.3 g L-1, and 10 mM, respectively. The decomposition of industrial azo reactive dyes in an aqueous solution as well as in a textile effluent has also been demonstrated using a modified pulsed low-frequency US cavitation process involving the thermal activation of PS without the use of HTN, which justifies its suitability for a commercial application.
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Affiliation(s)
- Jameelammal Shajeelammal
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P.O, Pappanamcode Thiruvananthapuram, 695019, Kerala, India
| | - Shahansha Mohammed
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P.O, Pappanamcode Thiruvananthapuram, 695019, Kerala, India
| | - Adersh Asok
- Photosciences and Photonics Section, Chemical Sciences and Technology Division (CSTD), CSIR-NIIST, Thiruvananthapuram, 695019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Satyajit Shukla
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P.O, Pappanamcode Thiruvananthapuram, 695019, Kerala, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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Bloch K, Mohammed SM, Karmakar S, Shukla S, Asok A, Banerjee K, Patil-Sawant R, Mohd Kaus NH, Thongmee S, Ghosh S. Catalytic dye degradation by novel phytofabricated silver/zinc oxide composites. Front Chem 2022; 10:1013077. [DOI: 10.3389/fchem.2022.1013077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Accepted: 10/11/2022] [Indexed: 11/13/2022] Open
Abstract
Phytofabrication of the nanoparticles with exotic shape and size is an attractive area where nanostructures with noteworthy physicochemical and optoelectronic properties that can be significantly employed for photocatalytic dye degradation. In this study a medicinal plant, Plumbago auriculata leaf extract (PALE) was used to synthesize zinc oxide particles (ZnOPs) and silver mixed zinc oxide particles (ZnOAg1Ps, ZnOAg10Ps, ZnO10Ag1Ps) by varying the concentration of the metal precursor salts, i.e. zinc acetate and silver nitrate. The PALE showed significantly high concentrations of polyphenols, flavonoids, reducing sugar, starch, citric acid and plumbagin up to 314.3 ± 0.33, 960.0 ± 2.88, 121.3 ± 4.60, 150.3 ± 3.17, 109.4 ± 2.36, and 260.4 ± 8.90 μg/ml, respectively which might play an important role for green synthesis and capping of the phytogenic nanoparticles. The resulting particles were polydispersed which were mostly irregular, spherical, hexagonal and rod like in shape. The pristine ZnOPs exhibited a UV absorption band at 352 nm which shifted around 370 in the Ag mixed ZnOPs with concomitant appearance of peaks at 560 and 635 nm in ZnO10Ag1Ps and ZnOAg1Ps, respectively. The majority of the ZnOPs, ZnOAg1Ps, ZnOAg10Ps, and ZnO10Ag1Ps were 407, 98, 231, and 90 nm in size, respectively. Energy dispersive spectra confirmed the elemental composition of the particles while Fourier transform infrared spectra showed the involvement of the peptide and methyl functional groups in the synthesis and capping of the particles. The composites exhibited superior photocatalytic degradation of methylene blue dye, maximum being 95.7% by the ZnOAg10Ps with a rate constant of 0.0463 s−1 following a first order kinetic model. The present result clearly highlights that Ag mixed ZnOPs synthesized using Plumbago auriculata leaf extract (PALE) can play a critical role in removal of hazardous dyes from effluents of textile and dye industries. Further expanding the application of these phytofabricated composites will promote a significant complementary and alternative strategy for treating refractory pollutants from wastewater.
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Gami B, Bloch K, Mohammed SM, Karmakar S, Shukla S, Asok A, Thongmee S, Ghosh S. Leucophyllum frutescens mediated synthesis of silver and gold nanoparticles for catalytic dye degradation. Front Chem 2022; 10:932416. [PMID: 36247678 PMCID: PMC9557002 DOI: 10.3389/fchem.2022.932416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/29/2022] [Indexed: 01/14/2023] Open
Abstract
The application of nanotechnology is gaining worldwide attention due to attractive physico-chemical and opto-electronic properties of nanoparticles that can be also employed for catalytic dye degradation. This study reports a phytogenic approach for fabrication of silver (AgNPs) and gold nanoparticles (AuNPs) using Leucophyllum frutescens (Berl.) I. M. Johnst (Scrophulariaceae) leaf extract (LFLE). Development of intense dark brown and purple color indicated the synthesis of AgNPs and AuNPs, respectively. Further characterization using UV-visible spectroscopy revealed sharp peak at 460 nm and 540 nm for AgNPs and AuNPs, respectively that were associated to their surface plasmon resonance. High resolution transmission electron microscope (HRTEM) revealed the spherical shape of the AgNPs, whereas anisotropic AuNPs were spherical, triangular and blunt ended hexagons. The majority of the spherical AgNPs and AuNPs were ∼50 ± 15 nm and ∼22 ± 20 nm, respectively. Various reaction parameters such as, metal salt concentration, temperature and concentration of the leaf extract were optimized. Maximum synthesis of AgNPs was obtained when 5 mM for AgNO3 reacted with 10% LFLE for 48 h at 50°C. Likewise, AuNPs synthesis was highest when 2 mM HAuCl4 reacted with 10% LFLE for 5 h at 30°C. Energy dispersive spectroscopy (EDS) showed phase purity of both the nanoparticles and confirmed elemental silver and gold in AgNPs and AuNPs, respectively. The average hydrodynamic particles size of AgNPs was 34.8 nm while AuNPs was 140.8 nm as revealed using dynamic light scattering (DLS) that might be due to agglomeration of smaller nanoparticles into larger clusters. ZETA potential of AgNPs and AuNPs were 0.67 mV and 5.70 mV, respectively. X-ray diffraction (XRD) analysis confirmed the crystallinity of the nanoparticles. Fourier transform infrared spectroscopy (FTIR) confirmed that various functional groups from the phytochemicals present in LFLE played a significant role in reduction and stabilization during the biogenic synthesis of the nanoparticles. The bioreduced AgNPs and AuNPs catalytically degraded Rhodamine B dye (RhB) in presence of UV-light with degradation rate constants of 0.0231 s−1 and 0.00831 s−1, respectively. RhB degradation followed a first order rate kinetics with 23.1 % and 31.7% degradation by AgNPs and AuNPs, respectively.
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Affiliation(s)
- Bansuri Gami
- Department of Microbiology, School of Science, RK University, Rajkot, India
| | - Khalida Bloch
- Department of Microbiology, School of Science, RK University, Rajkot, India
| | - Shahansha M. Mohammed
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India
| | - Srikanta Karmakar
- Department of Polymer Science and Technology, Calcutta University, Kolkata, India
| | - Satyajit Shukla
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Adersh Asok
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
- Photosciences and Photonics Section, Chemical Sciences and Technology Division (CSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India
| | - Sirikanjana Thongmee
- Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand
- *Correspondence: Sirikanjana Thongmee, ; Sougata Ghosh,
| | - Sougata Ghosh
- Department of Microbiology, School of Science, RK University, Rajkot, India
- Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand
- *Correspondence: Sirikanjana Thongmee, ; Sougata Ghosh,
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Mohammed S, Shajeelammal J, Asok A, Shukla S. Autoclave and pulsed ultrasound cavitation based thermal activation of persulfate for regeneration of hydrogen titanate nanotubes as recyclable dye adsorbent. Environ Sci Pollut Res Int 2022; 29:63304-63320. [PMID: 35449338 DOI: 10.1007/s11356-022-20282-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
In the dye removal application, regeneration of hydrogen titanate nanotubes (HTN, H2Ti3O7) has been achieved via thermal activation of persulfate anion (PS, S2O82-) by using the conventional hot plate technique which has limitations from the commercial perspective since it does not provide any precise control over the thermal generation process typically during the scale-up operation. To overcome this drawback, HTN have been synthesized via hydrothermal process which exhibit the methylene blue (MB) adsorption of 93% at the initial dye concentration and solution pH of 90 µM and 10 respectively. HTN have been regenerated via the thermal activation of PS by varying its initial concentration and regeneration temperature, within the range of 0.27-1 wt% and 40-80 °C, under the thermal conditions set by the autoclave and pulsed ultrasound (US) cavitation process. The results of recycling experiments suggest that the optimum values of initial PS concentration and temperature, for the regeneration of HTN under the autoclave conditions, are 1 wt% and 70 °C with the maximum MB adsorption of 92%, while, the corresponding values for the pulsed US cavitation process are 1 wt%, 80 °C, and 91% respectively. Thus, the regeneration and recycling of HTN have been successfully demonstrated by using the autoclave and pulsed US cavitation process. Under the optimum conditions, MB degradation involves the generation and attack of SO4•- for both the thermal generation techniques. The regeneration techniques developed here may be utilized in future during the scale-up operation and also for the regeneration of adsorbents besides HTN.
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Affiliation(s)
- Shahansha Mohammed
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P. O., Pappanamcode, Thiruvananthapuram, 695019, Kerala, India
- Department of Applied Chemistry, Cochin University of Science and Technology (CUSAT), Kochi, 682022, Kerala, India
| | - Jameelammal Shajeelammal
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P. O., Pappanamcode, Thiruvananthapuram, 695019, Kerala, India
| | - Adersh Asok
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Photosciences and Photonics Section (PPS), Chemical Sciences and Technology Division (CSTD), CSIR-NIIST, Thiruvananthapuram, 695019, Kerala, India
| | - Satyajit Shukla
- Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P. O., Pappanamcode, Thiruvananthapuram, 695019, Kerala, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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Nabeela K, Thorat MN, Backer SN, Ramachandran AM, Thomas RT, Preethikumar G, Mohamed AP, Asok A, Dastager SG, Pillai S. Hydrophilic 3D Interconnected Network of Bacterial Nanocellulose/Black Titania Photothermal Foams as an Efficient Interfacial Solar Evaporator. ACS Appl Bio Mater 2021; 4:4373-4383. [PMID: 35006849 DOI: 10.1021/acsabm.1c00143] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The design and development of scalable, efficient photothermal evaporator systems that reduce microplastic pollution are highly desirable. Herein, a sustainable bacterial nanocellulose (BNC)-based self-floating bilayer photothermal foam (PTFb) is designed that eases the effective confinement of solar light for efficient freshwater production via interfacial heating. The sandwich nanoarchitectured porous bilayer solar evaporator consists of a top solar-harvesting blackbody layer composed of broad-spectrum active black titania (BT) nanoparticles embedded in the BNC matrix and a thick bottom layer of pristine BNC for agile thermal management, the efficient wicking of bulk water, and staying afloat. A decisive advantage of the BNC network is that it enables the fabrication of a lightweight photothermal foam with reduced thermal conductivity and high wet strength. Additionally, the hydrophilic three-dimensional (3D) interconnected porous network of BNC contributes to the fast evaporation of water under ambient solar conditions with reduced vaporization enthalpy by virtue of intermediated water generated via a BNC-water interaction. The fabricated PTFb is found to yield a water evaporation efficiency of 84.3% (under 1054 W m-2) with 4 wt % BT loading. Furthermore, scalable PTFb realized a water production rate of 1.26 L m-2 h-1 under real-time conditions. The developed eco-friendly BNC-supported BT foams could be used in applications such as solar desalination, contaminated water purification, extraction of water from moisture, etc., and thus could address one of the major present-day global concerns of drinking water scarcity.
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Affiliation(s)
- Kallayi Nabeela
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
| | - Meghana Namdeo Thorat
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India.,CSIR-National Chemical Laboratory (NCL), Pune, Maharashtra 411008, India
| | - Sumina Namboorimadathil Backer
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
| | - Animesh M Ramachandran
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India
| | - Reny Thankam Thomas
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India
| | - Gopika Preethikumar
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India
| | - A Peer Mohamed
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India
| | - Adersh Asok
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
| | - Syed Gulam Dastager
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India.,CSIR-National Chemical Laboratory (NCL), Pune, Maharashtra 411008, India
| | - Saju Pillai
- Functional Materials, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, Kerala 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
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Joseph R, Asok A, Joseph K. Quinoline appended pillar[5]arene (QPA) as Fe 3+ sensor and complex of Fe 3+ (FeQPA) as a selective sensor for F -, arginine and lysine in the aqueous medium. Spectrochim Acta A Mol Biomol Spectrosc 2020; 224:117390. [PMID: 31336324 DOI: 10.1016/j.saa.2019.117390] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/07/2019] [Accepted: 07/14/2019] [Indexed: 06/10/2023]
Abstract
A quinoline functionalized pillar[5]arene, QPA has been prepared and its interaction with biologically relevant ions and molecules in aqueous solution has been demonstrated. The sensor molecule, QPA has shown selectivity towards Fe3+ among eleven metal ions studied. The Fe3+ complex of QPA (FeQPA) selectively interacts with F- among halides by ∼4 fold fluorescence enhancement. Further, FeQPA has shown selectivity towards arginine and lysine among twenty naturally occurring amino acids. The binding of QPA with Fe3+ has been confirmed by MALDI-TOF and 1H NMR titrations.
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Affiliation(s)
- Roymon Joseph
- Department of Chemistry, Indian Institute of Space Science and Technology (IIST), Thiruvananthapuram, Kerala 695547, India.
| | - Adersh Asok
- Material Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695019, India
| | - Kuruvilla Joseph
- Department of Chemistry, Indian Institute of Space Science and Technology (IIST), Thiruvananthapuram, Kerala 695547, India
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Asok A, Deshlahra P, Ramachandran AM, Kulkarni AR. Multifunctional Photostable Nanocomplex of ZnO Quantum Dots and Avobenzone via the Promotion of Enolate Tautomer. Glob Chall 2018; 2:1800025. [PMID: 31565311 PMCID: PMC6607145 DOI: 10.1002/gch2.201800025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 05/29/2018] [Indexed: 06/10/2023]
Abstract
Ideal multifunctional ultraviolet radiation (UVR) absorbents with excellent photostability, high molar absorptivity, broadband UVR screening, and desired skin sensorial properties remain a significant challenge for the sunscreen industry. The potential of the nanocomplex (NCx) formed by microwave synthesis of ZnO quantum dots (QDs) in the presence of Avobenzone (Av) for achieving these goals is reported. The NCx exhibits unique synergy between ZnO QD and Av components, which enhances the photostability and molar absorptivity, extends UVA filtering range, and provides a visible emission that matches the typical human in vivo skin emission color. Density functional theory (DFT) and time-dependent DFT calculations of ZnO-Av hybrid structures and comparison of their spectroscopic features with experiments suggest that ZnO QDs catalyze the formation of highly photostable surface enolate species via aldol condensation reaction. The combination of experiments and computations used in this study can advance the science and technology of photoprotection.
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Affiliation(s)
- Adersh Asok
- Materials Science and Technology DivisionNational Institute for Interdisciplinary Science and TechnologyCouncil of Scientific and Industrial ResearchThiruvananthapuram695019India
| | - Prashant Deshlahra
- Department of Chemical and Biological EngineeringTufts University4 Colby St.MedfordMA02155USA
| | - Animesh M. Ramachandran
- Materials Science and Technology DivisionNational Institute for Interdisciplinary Science and TechnologyCouncil of Scientific and Industrial ResearchThiruvananthapuram695019India
| | - Ajit R. Kulkarni
- Department of Metallurgical Engineering and Materials ScienceIndian Institute of Technology BombayMumbai400076India
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Chakraborty T, Asok A, Stanton ME, Rosen JB. Variants of contextual fear conditioning induce differential patterns of Egr-1 activity within the young adult prefrontal cortex. Behav Brain Res 2016; 302:122-30. [PMID: 26778782 DOI: 10.1016/j.bbr.2016.01.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 12/24/2015] [Accepted: 01/05/2016] [Indexed: 01/17/2023]
Abstract
Contextual fear conditioning is a form of associative learning where animals must experience a context before they can associate it with an aversive stimulus. Single-trial contextual fear conditioning (sCFC) and the context preexposure facilitation effect (CPFE) are two variants of CFC where learning about the context is temporally contiguous (sCFC) with or separated (CPFE) from receiving a footshock in that context. Neural activity within CA1 of the dorsal hippocampus (CA1), amygdala (LA), and prefrontal cortex (PFC) may play a critical role when animals learn to associate a context with a footshock (i.e., training). Previous studies from our lab have found that early-growth-response gene 1 (Egr-1), an immediate early gene, exhibits unique patterns of activity within regions of the PFC following training in sCFC and the CPFE of juvenile rats. In the present study, we extended our studies by examining Egr-1 expression in young adult rats to determine (1) if our previous work reflected changes unique to development or extend into adulthood and (2) to contrast expression profiles between sCFC and the CPFE. Rats that learned context fear with sCFC showed increased Egr-1 in the anterior cingulate, orbitofrontal and infralimbic cortices relative to non-associative controls following training, but expression in prelimbic cortex did not differ between fear conditioned and non-associative controls. In contrast, rats trained in the CPFE also showed increased Egr-1 in all the prefrontal cortex regions, including prelimbic cortex. These findings replicate our previous findings in juveniles and suggest that Egr-1 in specific PFC subregions may be uniquely involved in learning context-fear in the CPFE compared to sCFC.
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Affiliation(s)
- T Chakraborty
- University of Delaware, Department of Psychological and Brain Sciences, Newark, DE 19716, United States
| | - A Asok
- University of Delaware, Department of Psychological and Brain Sciences, Newark, DE 19716, United States
| | - M E Stanton
- University of Delaware, Department of Psychological and Brain Sciences, Newark, DE 19716, United States
| | - J B Rosen
- University of Delaware, Department of Psychological and Brain Sciences, Newark, DE 19716, United States.
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Abstract
AbstractIn sunscreens, ZnO nanoparticles (NPs) are used as inorganic UV filter which have a prominent band edge emission in the UVA region (~385 nm). When applied to biological surface, this highly penetrating UVA emission from ZnO NPs would enhance the generation of reactive oxygen species resulting in oxidative stress. Therefore, the elimination of this harmful UVA emission from ZnO NPs are much sought after for the development of safer sunscreens. In this paper we introduce the use of defect-rich ZnO (D-ZnO) quantum dots (QDs) as a multifunctional active ingredient in sunscreen/cosmetic application. These D-ZnO QDs make use of their defect energy levels to emit in visible region by bypassing their harmful band edge emission at UVA region. The D-ZnO QDs also showed prominent visible luminescence which matches well with the autofluorescence of in vivo human skin. Hence, this visible luminescence could be useful for camouflaging, thereby enabling its potential as a biologically safe active ingredient for both cosmetic and UV screening applications.
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Affiliation(s)
- Adersh Asok
- 1Centre for Research in Nanotechnology and Science, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Ajit R. Kulkarni
- 2Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Mayuri N. Gandhi
- 1Centre for Research in Nanotechnology and Science, Indian Institute of Technology Bombay, Mumbai 400076, India
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Asok A, Ghosh S, More PA, Chopade BA, Gandhi MN, Kulkarni AR. Surface defect rich ZnO quantum dots as antioxidants inhibiting α-amylase and α-glucosidase: a potential anti-diabetic nanomedicine. J Mater Chem B 2015; 3:4597-4606. [DOI: 10.1039/c5tb00407a] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The antioxidant and enzyme inhibitory activity of defect rich ZnO quantum dots is reported, which shows potential for developing anti-diabetic nanomedicine.
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Affiliation(s)
- Adersh Asok
- Centre for Research in Nanotechnology and Science
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
| | - Sougata Ghosh
- Institute of Bioinformatics and Biotechnology
- University of Pune
- Pune-411007
- India
| | - Piyush A. More
- Institute of Bioinformatics and Biotechnology
- University of Pune
- Pune-411007
- India
| | - Balu A. Chopade
- Department of Microbiology
- University of Pune
- Pune-411007
- India
| | - Mayuri N. Gandhi
- Centre for Research in Nanotechnology and Science
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
| | - Ajit R. Kulkarni
- Department of Metallurgical Engineering and Materials Science
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
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Ghosh S, More P, Derle A, Patil AB, Markad P, Asok A, Kumbhar N, Shaikh ML, Ramanamurthy B, Shinde VS, Dhavale DD, Chopade BA. Diosgenin from Dioscorea bulbifera: novel hit for treatment of type II diabetes mellitus with inhibitory activity against α-amylase and α-glucosidase. PLoS One 2014; 9:e106039. [PMID: 25216353 PMCID: PMC4162539 DOI: 10.1371/journal.pone.0106039] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 07/27/2014] [Indexed: 12/11/2022] Open
Abstract
Diabetes mellitus is a multifactorial metabolic disease characterized by post-prandial hyperglycemia (PPHG). α-amylase and α-glucosidase inhibitors aim to explore novel therapeutic agents. Herein we report the promises of Dioscorea bulbifera and its bioactive principle, diosgenin as novel α-amylase and α-glucosidase inhibitor. Among petroleum ether, ethyl acetate, methanol and 70% ethanol (v/v) extracts of bulbs of D. bulbifera, ethyl acetate extract showed highest inhibition upto 72.06 ± 0.51% and 82.64 ± 2.32% against α-amylase and α-glucosidase respectively. GC-TOF-MS analysis of ethyl acetate extract indicated presence of high diosgenin content. Diosgenin was isolated and identified by FTIR, 1H NMR and 13C NMR and confirmed by HPLC which showed an α-amylase and α-glucosidase inhibition upto 70.94 ± 1.24% and 81.71 ± 3.39%, respectively. Kinetic studies confirmed the uncompetitive mode of binding of diosgenin to α-amylase indicated by lowering of both Km and Vm. Interaction studies revealed the quenching of intrinsic fluorescence of α-amylase in presence of diosgenin. Similarly, circular dichroism spectrometry showed diminished negative humped peaks at 208 nm and 222 nm. Molecular docking indicated hydrogen bonding between carboxyl group of Asp300, while hydrophobic interactions between Tyr62, Trp58, Trp59, Val163, His305 and Gln63 residues of α-amylase. Diosgenin interacted with two catalytic residues (Asp352 and Glu411) from α-glucosidase. This is the first report of its kind that provides an intense scientific rationale for use of diosgenin as novel drug candidate for type II diabetes mellitus.
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Affiliation(s)
- Sougata Ghosh
- Institute of Bioinformatics and Biotechnology, University of Pune, Pune, India
| | - Piyush More
- Institute of Bioinformatics and Biotechnology, University of Pune, Pune, India
| | - Abhishek Derle
- Institute of Bioinformatics and Biotechnology, University of Pune, Pune, India
| | - Ajay B. Patil
- Garware Research Centre, Department of Chemistry, University of Pune, Pune, India
| | - Pramod Markad
- Garware Research Centre, Department of Chemistry, University of Pune, Pune, India
| | - Adersh Asok
- Centre for Research in Nanotechnology and Science, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Navanath Kumbhar
- Institute of Bioinformatics and Biotechnology, University of Pune, Pune, India
| | - Mahemud L. Shaikh
- National Centre for Cell Science, University of Pune Campus, Ganeshkhind, Pune, India
| | - Boppana Ramanamurthy
- National Centre for Cell Science, University of Pune Campus, Ganeshkhind, Pune, India
| | - Vaishali S. Shinde
- Garware Research Centre, Department of Chemistry, University of Pune, Pune, India
| | - Dilip D. Dhavale
- Garware Research Centre, Department of Chemistry, University of Pune, Pune, India
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Schreiber WB, Asok A, Jablonski SA, Rosen JB, Stanton ME. Egr-1 mRNA expression patterns in the prefrontal cortex, hippocampus, and amygdala during variants of contextual fear conditioning in adolescent rats. Brain Res 2014; 1576:63-72. [PMID: 24976583 PMCID: PMC4138218 DOI: 10.1016/j.brainres.2014.06.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 06/03/2014] [Accepted: 06/05/2014] [Indexed: 10/25/2022]
Abstract
We report activation of the immediate-early gene Egr-1 in the lateral amygdala (LA), hippocampus (CA1), and medial prefrontal cortex (mPFC) 30-min following the training phase in the context pre-exposure facilitation effect (CPFE) and standard context fear conditioning (180 s context exposure→shock). On day one of the CPFE paradigm, postnatal day (PD) 31 rats (±1) were pre-exposed to Context A (Pre) or Context B (Alt-Pre) for 5 min followed by five additional 1-min exposures. A day later, Pre and Alt-Pre rats received a 2-s, 1.5 mA footshock immediately upon placement in Context A. Animals included in in situ hybridization were then sacrificed 30 (±3) min later. On day three, the behaviorally-tested Pre rats showed significantly more fear-conditioned freezing in Context A than Alt-Pre rats. Standard context fear conditioning groups showed much greater freezing than the Pre group, as well as no shock and immediate-shock controls. Thirty minutes after immediate shock training, Pre rats showed increased Egr-1 mRNA in the prelimbic mPFC relative to Alt-Pre rats. Standard context conditioning selectively increased Egr-1 in CA1. In the LA and mPFC, Egr-1 increased to a similar extent in no shock, immediate shock, and standard context conditioning relative to homecage controls. The present study demonstrates that Egr-1 mRNA expression has a complex relationship to fear learning in different brain regions and variants of context conditioning.
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Affiliation(s)
- W B Schreiber
- Department of Psychological & Brain Sciences, University of Delaware, Newark, DE 19716, USA
| | - A Asok
- Department of Psychological & Brain Sciences, University of Delaware, Newark, DE 19716, USA
| | - S A Jablonski
- Department of Psychological & Brain Sciences, University of Delaware, Newark, DE 19716, USA
| | - J B Rosen
- Department of Psychological & Brain Sciences, University of Delaware, Newark, DE 19716, USA
| | - M E Stanton
- Department of Psychological & Brain Sciences, University of Delaware, Newark, DE 19716, USA.
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Asok A, Gandhi MN, Kulkarni AR. Enhanced visible photoluminescence in ZnO quantum dots by promotion of oxygen vacancy formation. Nanoscale 2012; 4:4943-4946. [PMID: 22790095 DOI: 10.1039/c2nr31044a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report on the synthesis of ZnO quantum dots (QDs) rich in oxygen vacancies by inducing an oxygen deficient environment. The precise tunability of particle size is achieved by counter ion capping of the precursor used for synthesis. The prepared QDs show size tunable visible emission with high quantum yield.
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Affiliation(s)
- Adersh Asok
- Centre for Research in Nanotechnology and Science, Indian Institute of Technology Bombay, Mumbai 400076, India
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Setua S, Menon D, Asok A, Nair S, Koyakutty M. Folate receptor targeted, rare-earth oxide nanocrystals for bi-modal fluorescence and magnetic imaging of cancer cells. Biomaterials 2010; 31:714-29. [DOI: 10.1016/j.biomaterials.2009.09.090] [Citation(s) in RCA: 165] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Accepted: 09/23/2009] [Indexed: 01/10/2023]
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