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Pd/Fe_(3)O_(4) supported on bio-waste derived cellulosic-carbon as a nanocatalyst for C-C coupling and electrocatalytic application

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Frontiers of Chemical Science and Engineering 2022年第10期16卷 1514-1525页

作者： Vishal Kandathil Akshay Moolakkil Pranav Kulkarni Alaap Kumizhi Veetil Manjunatha Kempasiddaiah sasidhar balappa somappa R.Geetha Balakrishna Siddappa A.Patil Centre for Nano and Material Sciences Jain UniversityJain Global CampusBangalore 562112India Organic Chemistry Section Chemical Sciences&Technology DivisionNational Institute for Interdisciplinary Science and Technology(CSIR)Thiruvananthapuram 695019India

The current work describes the synthesis of a new bio-waste derived cellulosic-carbon supportedpalladium nanoparticles enriched magnetic nanocatalyst(Pd/Fe_(3)O_(4)@C)using a simple multi-step process under aerobic *** mild reaction conditions,the Pd/Fe_(3)O_(4)@C magnetic nanocatalyst demonstrated excellent catalytic activity in the Hiyama cross-coupling reaction for a variety of ***,the Pd/Fe_(3)O_(4)@C magnetic nanocatalyst exhibited excellent catalytic activity up to five recycles without significant catalytic activity loss in the Hiyama cross-coupling ***,we explored the use of Pd/Fe_(3)O_(4)@C magnetic nanocatalyst as an electrocatalyst for hydrogen evolution ***,the Pd/Fe_(3)O_(4)@C magnetic nanocatalyst exhibited better electrochemical activity compared to bare carbon and magnetite(Fe_(3)O_(4)nanoparticles)with an overpotential of 293 mV at a current density of 10 mA·cm^(–2).

关键词： bio-waste cellulosic-carbon Pd/Fe_(3)O_(4) Hiyama cross-coupling hydrogen evolution reaction recyclability

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Phytochemical composition of Caesalpinia crista extract as potential source for inhibiting cholinesterase and β-amyloid aggregation: Significance to Alzheimer's disease

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Asian Pacific Journal of Tropical Biomedicine 2018年第10期8卷 500-512页

作者： Kolambe Rajappa Chethana balappa somappa sasidhar Mahadeva Naika Rangappa Sangappa Keri Centre for Nano and Material Sciences Jain UniversityJain Global Campus Chemical Sciences and Technology Division CSIR-National Institute for InterdisciplinaryScience and Technology (CSIR-NIIST) Applied Nutrition Division Defence Food Research Laboratory

Objective: To screen plant extract fractions and elucidate the components present in Caesalpinia crista(C. crista) leaves for cholinergic and anti-amyloidogenic activities for the treatment of Alzheimer's diseases. Methods: This work has been carried out to study the action of C. crista extracts from nonpolar to polar solvents toward inhibition of oxidative stress, cholinergic and amyloidosis. The antioxidant activity was studied using DPPH total antioxidant assay; cholinergic assay by Ellman's method and anti-amyloidogenic assay by thioflavin-T fluorescence and transmission electron microscopy. Results: The quantification of polyphenols was carried out following C. crista methanolic extract(CCMeOH) HPLC fingerprinting, along with LC-MS and elucidated by MS LAMPS database. GC-MS of CCMeOH was screened for potential moieties. In vitro experimental results showed that the CCMe OH was potential extract that exhibited active inhibition of antioxidant property, cholinergic enzymes acetylcholinesterase and butyrylcholinesterase. For anti-amyloidogenic evaluations, among all the extracts, the CCMe OH was found to have the potential toward inhibiting the oligomers, fibrillation of Aβ42 with good defibrillation of amyloid cascading properties. Conclusions: These results are also supported by the presence of polyphenols as the active ingredients. Multi-potent target drug therapy is a promising option in treating the Alzheimer's diseases. Methanolic extract of C. crista shows potential activity against cholinergic enzymes, Aβ42 aggregation with antioxidant activity.

关键词： Alzheimer’s disease Caesalpinia crista Acetylcholinesterase Butyrylcholinesterase β-Amyloid

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