9 research outputs found
Synthesis, Characterization, and Evaluation of Castor Oil-Based Acylated Derivatives as Potential Lubricant Base Stocks
Synthesis,
characterization, and evaluation of a series of novel
acylated derivatives of castor oil as biolubricant base stocks are
described. The acylated derivatives of castor oil, castor oil fatty
acid methyl and 2-ethylhexyl esters were synthesized using different
anhydrides (C<sub>1</sub>–C<sub>6</sub>) in about 90–95%
yield. All the products were structurally characterized using NMR
and IR spectral data. The acylated products were evaluated for their
physicochemical and lubricant properties. Although these products
belong to group V, based on viscosity index (130–156), acylated
derivatives of castor fatty acid alkyl esters belong to group III,
the category of base fluids as per API classification. The acylated
products exhibited excellent pour point (−21 to −39
°C) and flash point (174–280 °C). The hexanoylated
and butanoylated esters of castor oil exhibited excellent flash points
of 280 and 272 °C, respectively. The air release value was found
to be excellent in the range of 0.38–0.99 min, and NOACK volatilities
in the range of 3.25–3.92%. The other lubrication properties
such as load carrying capacity, and emulsion stability were found
to be good. Therefore, these derivatives will have utility in hydraulic
and metal working fluids and other industrial fluids with their wide
range of properties
Synthesis and evaluation of anti-oxidant and cytotoxic activities of novel 10-undecenoic acid methyl ester based lipoconjugates of phenolic acids
The synthesis of five novel methyl 10-undecenoate-based lipoconjugates of phenolic acids from undecenoic acid was carried out. Undecenoic acid was methylated to methyl 10-undecenoate which was subjected to a thiol–ene reaction with cysteamine hydrochloride. Further amidation of the amine was carried out with different phenolic acids such as caffeic, ferulic, sinapic, coumaric and cinnamic acid. All synthesized compounds were fully characterized and their structures were confirmed by spectral data. The anti-oxidant activity of the synthesized lipoconjugates of phenolic acids was studied by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay and also by the inhibition of linoleic acid oxidation in micellar medium by differential scanning calorimetry (DSC). The prepared compounds were also screened for their cytotoxic activity against five cell lines. It was observed that the lipoconjugates of caffeic acid, sinapic acid, ferulic acid, and coumaric acid displayed anticancer and anti-oxidant properties. The anticancer properties of these derivatives have been assessed by their IC50 inhibitory values in the proliferation of MDA-MB231, SKOV3, MCF7, DU 145 and HepG2 cancer cell lines
Preparation and Properties of Lubricant Base Stocks from Epoxidized Karanja Oil and Its Alkyl Esters
Lubricant base stocks
of epoxidized oil and its alkyl esters namely
epoxidized karanja fatty acid methyl, butyl, 2-methyl-1-propyl, and
2-ethylhexyl esters were synthesized from renewable nonedible source
karanja oil (<i>Pongamia glabra</i>). The reaction was carried
out using peroxy formic acid (HCOOH) generated <i>in situ,</i> 30 wt % aqueous hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) by
monitoring oxirane oxygen value. The optimized conditions to obtain
epoxidized products were oil/ester: HCOOH: H<sub>2</sub>O<sub>2</sub> (1:2:8/1:1.5:3 mol/mol/mol). The epoxidized products were obtained
in 90–97% conversion by GC analysis. All the products were
characterized by GC, GC-MS, IR, <sup>1</sup>H NMR spectral studies.
The synthesized products were evaluated for physicochemical and lubricant
properties. Based on viscosity index all the products belong to group
III, category of base fluids as per API classification. Expecting
pour point values that are on higher side, other lubrication properties
such as viscosity, VI, flash point, Cu corrosion value, and air release
value were found to be good
Novel Acyl Derivatives from Karanja Oil: Alternative Renewable Lubricant Base Stocks
Lubricant base stocks of acylated oil and its derivatives, namely,
propionylated, butanoylated, and hexanoylated karanja oil and fatty
acid methyl esters, were synthesized from renewable nonedible source
karanja oil (Pongamia glabra). The
reaction was carried out by Prilezhaev dihydroxylation, an in situ
peroxyformic acid generated using hydrogen peroxide and formic acid.
The hydroxylated derivatives were acylated with three acid anhydrides
(C<sub>3</sub>, C<sub>4</sub>, and C<sub>6</sub>). All of the synthesized
products were examined for their purity by GC and GC-MS and characterized
by IR and <sup>1</sup>H NMR spectral studies. The acylated derivatives
were evaluated for physicochemical and lubricant properties. Propionylated
and butanoylated esters of KFAME were found suitable as IS: 3098 hydraulic
fluids in ISO VG 46 and ISO VG 68 categories, respectively. In addition,
propionylated esters of KFAME are also suitable as IS: 8406 gear oils
(R&O type). Other lubrication properties such as viscosity, viscosity
index of all products belonging to group III, category of base fluids
as per API classification, Cu corrosion value, weld point, and air
release value were found to be good. These base stocks may find applications
in hydraulic fluids and metal-working fluids