scholarly journals Synthesis of Carbon Quantum Dot from Water Hyacinth Stalk by Radiation Processing

2020 ◽  
Vol 36 (05) ◽  
pp. 897-902
Author(s):  
Kanokorn Wechakorn ◽  
Panida Sangangam ◽  
Nattamon Puengposop ◽  
Pattra Lertsarawut ◽  
Tanagorn Kwamman
Keyword(s):  
Water Hyacinth ◽  
Large Scale ◽  
Fluorescence Emission ◽  
Chemical Properties ◽  
Quantum Yields ◽  
Scale Production ◽  
Radiation Processing ◽  
One Pot ◽  
Ethanol Pretreatment ◽  
Water Hyacinths

Water hyacinth is a severe issue, resulting in river blocking in high flood risk areas like Pathum Thani province, Thailand. To reduce the amount of invasive water hyacinths, their stalks were used as carbon precursors for carbon dots (CDs) by one-pot gamma irradiation, which is a promising method for high-quality and large-scale production. Furthermore, this method was compared with the conventional hydrothermal method. This finding proved that the optical properties of as-prepared CDs from both methods were no significant differences. The CD solution had a pale yellow color and exhibited tuneable fluorescence emission. They are strongly absorbed in the UV region of 250-300 nm. An effect of ethanol pretreatment was also studied. It was found that the ethanol pretreatment has no substantial effect on the photophysical and chemical properties of as-prepared CDs, whereas it was crucially affected by the pH stability of CDs. The maximum fluorescence emission of CDs with (ECD-G) and without (CD-G) ethanol pretreatment were 443 nm (~2.5% of quantum yields) and 440 nm (~2.0% of quantum yields) with the excitation at 360 nm, respectively. The carboxyl groups were the primary functional group of CD-G and ECD-G, confirmed by the FTIR spectroscopy.

An Efficient and Improved Process for the Synthesis of Itopride Hydrochloride and Trimethobenzamide Hydrochloride

2018 ◽  
Vol 15 (4) ◽  
pp. 572-575 ◽  
Author(s):  
Ponnusamy Kannan ◽  
Samuel I.D. Presley ◽  
Pallikondaperumal Shanmugasundaram ◽  
Nagapillai Prakash ◽  
Deivanayagam Easwaramoorthy
Keyword(s):  
Large Scale ◽  
Hydroxylamine Hydrochloride ◽  
Scale Production ◽  
One Pot ◽  
Hydrochloride Salt ◽  
Environmental Friendly ◽  
Large Scale Production ◽  
Non Ulcer Dyspepsia ◽  
Itopride Hydrochloride ◽  
Yield And Purity

Aim and Objective: Itopride is a prokinetic agent used for treating conditions like non-ulcer dyspepsia. Itopride is administered as its hydrochloride salt. Trimethobenzamide is used for treating nausea and vomiting and administered as its hydrochloride salt. The aim is to develop a novel and environmental friendly method for large-scale production of itopride and trimethobenzamide. Materials and Methods: Itopride and trimethobenzamide can be prepared from a common intermediate 4- (dimethylaminoethoxy) benzyl amine. The intermediate is prepared from one pot synthesis using Phyrdroxybenzaldehye and zinc dust and further reaction of the intermediate with substituted methoxy benzoic acid along with boric acid and PEG gives itopride and trimethobenzamide. Results: The intermediate 4-(dimethylaminoethoxy) benzylamine is prepared by treating p-hydroxybenzaldehyde and 2-dimethylaminoethyl chloride. The aldehyde formed is treated with hydroxylamine hydrochloride. The intermediate is confirmed by NMR and the purity is analysed by HPLC. Conclusion: Both itopride and trimethobenzamide were successfully synthesized by this method. The developed method is environmental friendly, economical for large-scale production with good yield and purity.

scholarly journals One-Pot Synthesis of 7, 7-Dimethyl-4-Phenyl-2-Thioxo-2,3,4,6,7, 8-Hexahydro-1H-Quinazoline-5-OnesUsing Zinc Ferrite Nanocatalyst and Its Bio Evaluation

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 431
Author(s):  
Tentu Nageswara Rao ◽  
Nalla Krishnarao ◽  
Faheem Ahmed ◽  
Suliman Yousef Alomar ◽  
Fadwa Albalawi ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Zinc Ferrite ◽  
Large Scale ◽  
Cyano Group ◽  
Proton Nuclear Magnetic Resonance ◽  
Scale Production ◽  
One Pot ◽  
Antibacterial And Antifungal ◽  
Nuclear Magnetic

A simple and highly efficient protocol for the synthesis of derivatives 7, 7-dimethyl-4-phenyl-2-thioxo-2, 3, 4, 6, 7, 8-hexahydro-1H-quinazoline-5-one from 5, 5-dimethyl cyclohexane-1, 3-dione (4a–4h) (dimedone) has been described. The aryl aldehydes were substituted with thiourea in the presence of synthesized zinc ferrite nanocatalyst, which increased the yield under reflux through condensation, followed by cyclization to give desired products. The other advantages are that it is eco-friendly and economically affordable for large-scale production. Structural validation and characterization of all the newly synthesized compounds were evaluated by spectral analysis (mass spectrometry, proton nuclear magnetic resonance (1HNMR), and Carbon-13 nuclear magnetic resonance(13CNMR)spectroscopies. The structure of antibacterial and antifungal assays was performed with the newly synthesized compounds. The antimicrobial activity of title compounds possessing electron-withdrawing groups such as (4e–4h) (Cl, Br, and cyano group) exhibited more active potential than the electron-donating groups, C6H5,4-C6H4, 3-OC2H5-4OH-C6H3, etc., (4a–4d) containing moiety.

One-pot synthesis of gold nanoparticles embedded in polysaccharide-based hydrogel: Physical-chemical characterization and feasibility for large-scale production

2019 ◽  
Vol 124 ◽  
pp. 838-845 ◽  
Author(s):  
Morgana Souza Marques ◽  
Κarine Modolon Zepon ◽  
Julia Maia Heckler ◽  
Fernando Dal Pont Morisso ◽  
Marcos Marques da Silva Paula ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Large Scale ◽  
Chemical Characterization ◽  
Scale Production ◽  
One Pot ◽  
One Pot Synthesis ◽  
Physical Chemical ◽  
Large Scale Production

scholarly journals Pratiques de production et caracteristiques physiques et chimiques du shô basi, un couscous de niebe (Vigna unguiculata) produit au Mali

2021 ◽  
Vol 21 (02) ◽  
pp. 17509-17528
Author(s):  
A Timitey ◽  
◽  
L Adinsi ◽  
YE Madodé ◽  
F Cissé ◽  
...  
Keyword(s):  
Vigna Unguiculata ◽  
Large Scale ◽  
Chemical Properties ◽  
Quality Criteria ◽  
Scale Production ◽  
Production Flow ◽  
Cowpea Seeds ◽  
Steam Cooking ◽  
End Products ◽  
Cowpea Varieties

In West Africa, cowpea is processed into several end-products among which the most consumed in Mali is a steamed granulated product known as cowpea couscous or Shô basi, in Bambara. Organoleptic properties ofShô basi are variable, probably as a consequence of the diversity of the practices of production. This study aims at determining these practices, their constraints and the physico-chemical characteristics of Shô basi as sold on Malian markets. A survey using focus group discussions, and involving eighteen (18) Shô basi production cooperatives, each gathering 8 to 32 members, was conducted in South Mali. The information collected was related to cowpea varieties used for production, flow diagrams, constraints of production, and quality criteria of the end-products. Eighteen (18) Shô basi samples were collected from the interviewed groups and used for the determination of the physical and chemical properties of Shô basi. Results showed that most of the processors were married, non or moderately literate and aged between 20 and 59 years women. The main cowpea varieties used for the production are sangaraka and wilibali, both from the species Vigna unguiculata. Both varieties of cowpea are characterized by a white or cream color. Shô basi is produced using a single process with two major technological variants. One involves a wet total dehulling (VDT), whereas the second involves a dry partial dehulling (VDP) of cowpea seeds. Regardless of the technological variant and cowpea variety used, interviewees indicated that a good qualityShô basi must have a light color, a soft mouthfeel texture, a homogeneous granule size and lacking beany flavor. Protein(25,0g/100g) and polyphenol (24,3mg/100g)contents as well as swelling level were similar for Shô basi from both variants. However, Shô basi from technology involving partial dehulling (VDP) was less bright, richer in fiber and minerals, and contained more fine granules thanShô basi involving whole dehulling(VDT). Cowpea dehulling, flour granulation, steam cooking and drying are the mean constraints for quality standardization and large-scale production of Shô basi in Mali.

Facile One-Pot Process for Large-Scale Production of Highly Pure Bosentan Monohydrate, an Endothelin Receptor Antagonist

2011 ◽  
Vol 15 (6) ◽  
pp. 1382-1387 ◽  
Author(s):  
Navnath C. Niphade ◽  
Kunal M. Jagtap ◽  
Chandrashekhar T. Gaikawad ◽  
Madhukar N. Jachak ◽  
Vijayavitthal T. Mathad
Keyword(s):  
Receptor Antagonist ◽  
Large Scale ◽  
Endothelin Receptor Antagonist ◽  
Scale Production ◽  
Endothelin Receptor ◽  
One Pot ◽  
Large Scale Production

Old is Gold? Nefopam Hydrochloride, a Non-opioid and Non-steroidal Analgesic Drug and Its Practical One-Pot Synthesis in a Single Solvent for Large-Scale Production

2017 ◽  
Vol 21 (11) ◽  
pp. 1745-1751 ◽  
Author(s):  
Mohan Reddy Bodireddy ◽  
Kiran Krishnaiah ◽  
Prashanth Kumar Babu ◽  
Chaithanya Bitra ◽  
Madhusudana Rao Gajula ◽  
...  
Keyword(s):  
Large Scale ◽  
Scale Production ◽  
Analgesic Drug ◽  
One Pot ◽  
One Pot Synthesis ◽  
Large Scale Production

Amines via Hydroaminomethylation: An Updated Overview

2021 ◽  
Vol 25 ◽  
Author(s):  
Carmela G. Arena
Keyword(s):  
Large Scale ◽  
Synthetic Methods ◽  
Catalytic Process ◽  
Scale Production ◽  
Tertiary Amines ◽  
Atom Economy ◽  
Reaction Conditions ◽  
One Pot ◽  
Large Scale Production ◽  
The Cost

: Aliphatic secondary and tertiary amines are widely used in the production of pharmaceuticals, agrochemicals, dyes, surfactants and rubber chemicals. Most traditional synthetic methods are often unsuitable for large-scale production due to poor selectivity, harsh reaction conditions and the cost of starting materials. In this context, hydroaminomethylation (HAM) is a very attractive catalytic process with high atom economy that starts from inexpensive reagents, such as alkenes. This review aims to provide an updated overview of hydroaminomethylation as a useful tool for synthesizing aliphatic secondary and tertiary amines. Therefore, the discussion will focus on both unsaturated starting compounds and the amines obtained by this one-pot reaction.

Graphene Production With Stirred Media Mills

2010 ◽  
Vol 1259 ◽  
Author(s):  
Catharina Knieke ◽  
Angela Berger ◽  
Wolfgang Peukert
Keyword(s):  
Large Scale ◽  
Chemical Properties ◽  
Single Layer ◽  
Single Layer Graphene ◽  
High Yield ◽  
Graphene Sheets ◽  
Multilayer Graphene ◽  
Scale Production ◽  
Graphite Particles ◽  
Media Milling

AbstractSince the discovery of stable graphene sheets by Novoselov und Geim in 2004 the one atom thick carbon material has been attracted great interest because of its outstanding physical, mechanical and chemical properties. Although there had been intensive research to find new ways in the preparation of single-layer graphene sheets in the last few years, especially the large-scale production of graphene still remains challenging. In this paper we present a new approach, which allows the high-yield production of graphene sheets in a simple stirred media milling process. Under mild milling conditions single- and multilayer graphene sheets have been successfully produced from commercial graphite powder in a liquid medium. During the delamination procedure, the graphite particles were stressed between the milling beads. Shear and compressive normal forces can lead under mild milling conditions, i.e. low stress energies, to a continuous mechanical peeling of graphene sheets from the graphite surface. By means of Atomic Force Microscopy a high yield of single- and multilayer graphene sheets was detected. A concentration of exfoliated sheets of 2 wt% starting from a 5 wt% suspension of coarse graphite particles could be determined after a milling time of only 3 h. This concentration is much higher than those, which were reached by most of the known chemical methods. Since stirred media milling can be realized as large-scale process, a high-yield and low-cost production of graphene flakes becomes possible at ambient temperature.

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