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- 저자 : Palanisamy Raji (검색결과 2 건)
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Palanisamy Raji,Jayaprakash Jayapriya,Dhamodharan Duraisami,변헌수 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
Metallic equipment and structures that come in contact with a variety of petroleum products, solvents, water, the atmosphere, and soil in the oil and gas industry are highly prone to a range of corrosion phenomena, which escalate the risk of serious accidents. The use of green corrosion inhibitors in oil and gas can significantly reduce the maintenance and service costs. This study focuses on the anti-corrosive behavior of natural exudate gums, such as Azadirachta indica (G1), Moringa oleifera (G2), Prosopis juliflora (G3) and Prunus dulcis (G4). These gums were evaluated as corrosion inhibitors on mild steel against the diesel/saline water biphasic system by the weight loss method and electrochemical techniques. The inhibition efficiency was high at 93.86, 95.75, 92.42, and 90.02% at the highest tested concentration (5,000 ppm) for the gums G1, G2, G3, and G4, respectively. Among the investigated natural gums, the lowest corrosion rate (29.36 mm yr−1) and highest inhibition efficiency (95.75%) were achieved with Moringa oleifera (G2) at 5,000 ppm. The activation energy of the corrosion inhibition process (4.00–38 kJmol−1) was higher than that of the uninhibited system (1.8 kJmol−1), indicating that the inhibited systems possessed higher energy barriers and followed the Langmuir adsorption process. Our corrosion test results validate that the Moringa oleifera gum can serve as an effective eco-friendly corrosion inhibitor for mild steel in the biphasic system of diesel/saline water.
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Mohandoss, Sonaimuthu,Atchudan, Raji,Immanuel Edison, Thomas Nesakumar Jebakumar,Mandal, Tapas Kumar,Palanisamy, Subramanian,You, SangGuan,Napoleon, Ayyakannu Arumugam,Shim, Jae-Jin,Lee, Yong Rok Applied Science Publishers 2019 Carbohydrate polymers Vol.224 No.-
<P><B>Abstract</B></P> <P>This study improves the water solubility and cellular uptake of guanosine (GuN) through an inclusion complexation with cyclodextrin derivatives (CDs), namely β-cyclodextrin (β-CD), hydroxypropyl-β-cyclodextrin (HP-β-CD), and sulfobutyl ether-β-cyclodextrin (SBE-β-CD). Inclusion complexes of GuN and CDs are synthesized in a 1:1 stoichiometric ratio with binding constants calculated using the Benesi–Hildebrand method. Characterizations of the prepared solid complexes using FTIR, XRD, TGA-DSC, and SEM indicate that GuN is found inside the cavity of the CDs. Moreover, <I>in silico</I> molecular modeling analysis identifies the most favorable binding interactions of GuN deeply encapsulated in the hydrophobic cavities of the CDs, as validated by PatchDock and FireDock servers. In addition, human breast cancer MCF-7 cell activity indicates that the SBE-β-CD:GuN complex displays better cell viability and cellular uptake than GuN or other inclusion complexes of β-CD:GuN and HP-β-CD:GuN.</P> <P><B>Highlights</B></P> <P> <UL> <LI> GuN with CDs inclusion complexes were synthesized in 1:1 stoichiometry. </LI> <LI> Solid complexes were confirmed by FTIR, XRD, TGA-DSC, and SEM analysis. </LI> <LI> Molecular simulations indicate strong H-bonding of GuN with CDs. </LI> <LI> CDs:GuN complexes showed significant cytotoxicity against MCF-7 cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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