Category: Readings

Recent advances in metal nanoparticles supported on Montmorillonite as catalysts for organic synthesis

urn:nbn:sciencein.jmns.2019v6.87

Published in Journal of Materials NanoScience

• Dipak Kumar Dutta
  CSIR-North East Institute of Science and Technology, Materials Sciences and Technology Division, Jorhat 785006, Assam

Keywords: Metal-Nanoparticles, Supported Catalysts, Heterogeneous Catalysts, Organic Synthesis

Abstract

Nanostructured materials has appealed considerable attention due to their characteristic properties and applications in different fields. Metal nanoparticles supported on modified montmorillonite composites have led to the generation of new and novel heterogeneous ‘Nanocatalysts’, which are much more efficient than other catalysts and thus pave the way for developing sustainable environmentally benign catalysis and chemical procedures. Such nanocatalysts are progressing towards their use in chemical industries. This review presents the recent trend of advances in the synthesis and catalytic reactions of supported metal nanoparticles on acid activated montmorillonite. Metals nanoparticles-montmorillonite composites show efficient catalytic activities with high conversions and selectivity for hydrogenation, transfer hydrogenation, oxidations and coupling reactions. Raw montmorillonite possess no catalytic activity, however acid activated montmorillonite exhibits excellent acid catalytic activities.

Dutta, D. (2019). Recent advances in metal nanoparticles supported on Montmorillonite as catalysts for organic synthesis. Journal of Materials NanoScience, 6(1), 19-31.

Retrieve full text from https://pubs.thesciencein.org/journal/index.php/jmns/article/view/87

urn:nbn:sciencein.cbl.2019v6.93
Formulation optimization of multicomponent aqueous coground mixtures of Meloxicam for dissolution enhancement
Multicomponent coground mixtures of meloxicam

Published in Chemical Biology Letters

• Sunita Dahiya University of Puerto Rico
• Atul Kaushik
• Kamla Pathak

Keywords: factorial design, solubility, drug delivery, hyrophilicity, PEG

Abstract

In present work, the role of various formulation excipients for dissolution enhancement of a BCS Class II drug, meloxicam was studied by formulating multicomponent aqueous coground mixtures using lactose, microcrystalline cellulose and three solubilizers; polyethylene glycol 400, propylene glycol and polyvinyl pyrrolidone. A 3³ full factorial design was employed using solubilizers’ concentrations as independent variables whereas angle of repose and in vitro drug dissolution as dependent variables in order to optimize the amounts of solubilizers. The results revealed more than fivefold increase in drug dissolution in some experimental batches compared to that of pure drug powder. Full and reduced models were evolved for the dependent variables and the reduced models were further validated using extra design check points. The studies suggested that the incorporation of optimized amounts of solubilizers could be successfully employed for achieving desired flow properties and enhanced drug dissolution of poorly water soluble meloxicam. The method emerged as a simple, cost-effective, and organic solvent-free green approach toward formulation development of meloxicam and may also be applied to other limited water-soluble drugs.

Dahiya, S., Kaushik, A., & Pathak, K. (2019). Formulation optimization of multicomponent aqueous coground mixtures of Meloxicam for dissolution enhancement. Chemical Biology Letters, 6(1), 1-7.

Full text link https://pubs.thesciencein.org/journal/index.php/cbl/article/view/93

The interaction and properties of light and heat with nanomaterials has brought new insights in the field of nanotechnology and nanoscience development. The recent advances of Photonics and Phononics of nanomaterials in form of research and review articles as thematic coverage of field to enlighten the knowledge of scholars span the subfield (though not limited to):

Nanophotonics of natural materials

Principles of nanophotonics

Near Field Optics Advances

SERS of 2D nanomaterilas

Computational nanophotonics

Static state computation of nanomaterials

Plasmonics

Metamaterials

Optical processor and chip development

Molecular nanophotonics

Tip Enhances Raman Spectroscopy TERS of 2D materials

Hybrid Nanophotonics

Fabrication of Nanophotonics

Nanophotonic Bioimaging

Nanophotonics Therapy

Chemistry of nanophotonics and nanophononics

Nanophotonics fluidic applications

Nanophotonics of metalic nanoparticles

Colloidal particle engineering

photonics crystals

lithography

How to submit

The manuscript should be submitted online on the journal site (select Nanophotonics and Nanophononics section during submission) at https://pubs.thesciencein.org/journal/index.php/jmns . The author guidelines and manuscript template is provided on the journal site.

Last date of submission: Submission ongoing

urn:nbn:sciencein.jbts.2019v6.90

Antidiabetic effect of Carissa carandas in rats and the possible mechanism of its insulin secretagogues activity in isolated pancreatic islets

• Rambir Singh Bundelkhand University
• Mansi Shrivastava Bundelkhand University
• Poonam Sharma Indira Gandhi National Tribal University

Keywords: Antidiabetic, Solvent Extract, Insulin, Plant fruits, phytochemicals, diabetes

Abstract

Carissa carandas (CC) has been used in folklore medicine for treatment of diabetes. In the present study, hexane, chloroform, ethyl acetate, methanol and aqueous extracts of CC fruit were examined for hypoglycemic activity in healthy Wistar rats. Aqueous Extract of CC (AECC) was most active and showed fall of 67.08% in fasting blood glucose from 0 to 1h in glucose tolerance test (GTT). The ED₅₀ of AECC was 300mg/kgbw in streptozotocin induced diabetic rats. Treatment of diabetic rats with ED₅₀ of AECC for 28 days significantly reduced post prandial glucose (PPG) by 33.65% (p<0.01), glycosylated hemoglobin (HbA1c) by 45.79% (p<0.01) and increased insulin level by 69.7% (p<0.05). The results indicated that increase in insulin secretion may be partly responsible for antidiabetic effect of AECC. To assess the mechanism of secretagogues activity, AECC was incubated with isolated pancreatic islets of healthy Wistar rats at basal (3.3mM) and high (16.7mM) level of glucose in presence or absence of Diazoxide (K-ATP channel opener), Nimodipine (Ca²⁺ Channel blocker) and Calphostin-C (PKC inhibitor). AECC induced insulin secretion at 16.7mM of glucose was significantly (p<0.01) reduced by Diazoxide and Nimodipine but non significantly (p>0.05) by Calphostin-C. The study indicated that the phytochemicals present in AECC may be inducing insulin secretion by closing K-ATP channels in β-cells of pancreatic islets.

Full text link: https://pubs.thesciencein.org/journal/index.php/jbts/article/view/90

urn:nbn:sciencein.jmns.2019v6.88

Nanochemistry and Nanocatalysis Science: Research advances and future perspective

Bhupender S. Chhikara, Rajender S. Varma

The development of nanomaterials has made its mark in nanocatalytic applications and ensuing plethora of nanotechnological advances. The size-dependent chemistry of nanomaterials and consequent controlled and designed synthesis of smart materials with desired end application has provided us a number of new products recently which are already making impact on quality of human life. The fundamental nano paradigm shift would influence future research advances in field of nanoscience chemistry, ranging from drug delivery to exquisite designs of novel catalysts that drive innovations in chemical synthesis and transformations.  The nanoscience is an interdisciplinary field that will see increased role in the diverse and emerging newer areas like artificial intelligence; nanochemistry would help speed up the development of applications in the real world with artificial intelligence.

Full text link: https://pubs.thesciencein.org/journal/index.php/jmns/article/view/88

It is a pride moment for ScienceIn family, editors, scientists and researchers that Dr. Rajender S Varma, the editor of JMNS and emeritus scientist, Environmental Protection Agency, USA has been awarded Haryana Vigyan Ratan Award (translation: Haryana Science Jewel Award) 2017 on February 28, 2019 at Haryana Raj Bhawan, Chandigarh. Dr. Varma has been given this recognition for his enormous research contribution in Green Chemistry, Catalysis, NanoScience-nanomaterials, nanochemistry, nanocatalysis. Prof. Rajender (Raj) S. Varma did Ph.D. from Delhi University in 1976. He is Editor of Journal of Materials NanoScience, advisory board member of several international journals and has published over 470 scientific papers and awarded 16 US Patents, 8 books, 27 book chapters and 3 encyclopedia contributions with over ~ 31,000 citations. He is highly accomplished researcher with high citations to his work having H -Index 96. Dr. Varma hail from a village in haryana (now in punjab). On receiving the award he said “It is a proud moment for a country boy”. It is a highest award from state government for scientists.

The Department of Science and Technology Haryana Government has instituted a highest honour for the contributions in field of scientific research with title “Haryana Vigya Ratan” to honor and acknowledge the contributions of researchers from Haryana and “Haryana Yuva Vigyan” Award for the recognition of young scientists.

Dr. Varma is editing a special section/issue on Nanochemistry and Nanocatalysis , researchers working in the field can contribute their research findings (research articles or review articles ) for consideration in the special section of the journal. More details available on Dr. Varma’s Nanochemistry special section Editor.

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1. R. Ping, M. Laura, P.S. Mario. Title of the journal article should be included here. Int. Lett.Org. Chem. 1996, 61, 4439–4449.
2. B.K. Sharma. Ph.D. Dissertation, Thesis Title, Cornell University, 1995.
3. R. Hussain, D. Shinkoi. Title of book like Synthesis and application of ionic liquid, John Wiley & Sons: New York, 2010.
4. R.S. Buchanod, D.K. Reddy. In Selective Organic Transformations; T.R. Thyagarajan, Ed.; Integrated science: New York, 2002; Vol. 2, pp 1–95.
5. G.L. Loyale, U.S. Patent 5 934 456, 1998; Chem. Abstr. 1998, 65, 2870.

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Conductive polymer nanocomposite enzyme immobilized biosensor for pesticide detection

urn:nbn:sciencein.jmns.2019v6.84

• Priyanka D Virutkar Rashtrasant Tukadoji Maharaj Nagpur University
• Ashish P Mahajan Rashtrasant Tukadoji Maharaj Nagpur University
• Bhavna H Meshram Rashtrasant Tukadoji Maharaj Nagpur University
• Subhash B Kondawar Rashtrasant Tukadoji Maharaj Nagpur University

Keywords: Carbon nanotubes, Acetylcholinesterase, Pesticides, Biosensors

Abstract

Conductive carbon nanotubes based polyaniline/polypyrrole polymer nanocomposite (CNT-PANI-PPy) film was electrochemically synthesized on graphite electrode using cyclic voltammetry. CNT-PANI-PPy film formed a biocompatible environment to entrap enzyme molecule and used as biosensor for pesticide detection. This study shows that enzyme based conductive polymer nanocomposite film itself acts as a mediator. Carbon nanotubes promote electron transfer reactions in presence of Acetythiocholine chloride (ATCl) as a substrate at a lower potential and catalyzed the electrochemical oxidation of enzymatically formed thiocholine. Surface morphology was studied by scanning electron microscopy which shows a porous structure of the modified film beneficial for enzyme immobilization. Electrochemical behavior of the fabricated electrodes evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The detection of pesticide (acephate) was performed by chronoamperometry and the limit of detection (LOD) of acephate was found to be 0.007 ppm concentration which is quite low.

Full text at: https://pubs.thesciencein.org/journal/index.php/jmns/article/view/84