2944-06-1Relevant academic research and scientific papers
Monoglyceride-based organogelator for broad-range oil uptake with high capacity
Wang, Dong,Niu, Jian,Wang, Zhenggong,Jin, Jian
, p. 1670 - 1674 (2015)
Oil/water separation has been a worldwide subject because of increasing release of oil-containing wastewater as well as several marine oil spills. The phase-selective organogelators (PSOGs) are thought to offer a potential and effective implement for addressing this issue. An ideal PSOG for oil adsorption must fulfill some requirements involving effective gelation, easy synthesis, low cost, and recyclable for reuse. However, beyond those, the ability of gelation for a broad-range oil phase without selectivity is also important. However, most of the reported PSOGs have limitation in this respect thus far. In this paper, a new class of saturated 1-monoglyceride-derived organogelators can efficiently uptake almost all of the common fuel oils from water and gelate organic solvents with extremely low minimum gelation concentration (MGC). In addition, the oils in the gel and gelator molecules can be recovered quantitatively through simple vacuum distillation.
Surface and Aggregation Properties of Synthesized Cetyl Alcohol Based Bis-Sulfosuccinate Gemini Surfactants in Aqueous Solution
Singh, Vinayika,Tyagi, Rashmi
, p. 111 - 118 (2016)
A series of cetyl alcohol based anionic bis-sulfosuccinate gemini surfactants (BSGSCA1,4; BSGSCA1,6 and BSGSCA1,8) with different spacer lengths was prepared using dibromoalkanes. The surfactant structure was elucidated using elemental analysis, Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (NMR). Surface tension measurements were used to determine the critical micelle concentration (CMC), the surface tension at the CMC (γ CMC), surface pressure at the CMC (π CMC) and efficiency of adsorption (pC20). On the basis of surface studies, the CMC and γ CMC decreases with increasing length of the spacer group. The micelle aggregation number, determined by fluorescence quenching studies, increases with increasing surfactant concentration above the CMC. The micropolarity in the micelle increases with increasing length of the spacer and decreases with increasing surfactant concentration.
Interfacial properties of novel surfactants based on maleic and succinic acid for potential application in personal care
Janni, Devi Sirisha,Pandya, Niki,Rajput, Gajendra,Subramanyam, Gayathri,Varade, Dharmesh
, (2021/09/20)
Hemiesters and Hemiamides of maleic and succinic acid viz. sodium lauryl succinate (C12SE), sodium lauryl maleate (C12ME), sodium lauryl succinamide (C12SA), sodium lauryl maleamide (C12MA), sodium hexadecyl succinate (C16SE) and sodium hexadecyl maleate (C16ME) were synthesized and investigated as surfactants in the pure water and aqueous hydrotrope [sodium p-toluene sulfonate (NaPTs)] solution. The chemical structures of the prepared surfactants were established by FTIR and 1H NMR spectroscopy. The surface tension measurements depicted low CMC and a high adsorption efficiency (pC20) which is highly beneficial for creating personal care formulations. The dynamic light scattering (DLS) technique indicated the formation of larger micelles which was important for skin care as larger micelles cannot penetrate the skin layer. Moreover, these surfactants depicted good foamability and stability attributed to faster monomer adsorption and small bubble size which was preferred for cleansing application. Additionally, low protein/lipid solubilization by these surfactants indicated its mild behaviour on skin as compared to other commonly used conventional anionic [sodium lauryl sulfate (SLS)], zwitterionic [cocamidopropyl betaine (CAPB)] and nonionic [decyl glucoside (DG)] surfactants. Viscosity measurements suggested decent thickening ability of surfactants in the presence of co-surfactant like lauramine oxide. Basis of all the properties discussed, these novel hemiesters and hemiamides seem promising as surfactants for improving various characteristics in potential personal care formulations.
Sialic acid lipid derivative and preparation method and application thereof
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Paragraph 0141-0146, (2019/12/29)
The invention belongs to the technical field of medicines, and provides a sialic acid lipid derivative which can be used for modifying a particle preparation and a preparation method and application thereof. The structural general formula of the sialic acid lipid derivative is as shown in the specification, wherein R1 is an H atom or C1-C6 alkyl; R2 is H, (CH2) m or C2-C6 alkenyl, and m =1-17; when X is an H atom or an O atom, R3 is (CH2) n or cholesteryl, and n = 1-17; when X is a carbonyl group, R3 is a C12-C24 alkoxy group, a C12-C24 alkyl substituted amino group or cholesteryl; and R4 is -OH, -NHCOCH3 or -NHCOCH2OH. The sialic acid lipid derivative disclosed by the invention can be used for modifying a particle preparation and realizing different treatment or diagnosis purposes according to the properties of the medicine. Especially in the anti-tumor aspect, the sialic acid lipid derivative can endow a particle preparation with excellent tumor targeting ability to improve the tumorinhibition effect.
A comparative study of the thermal properties of homologous series of crystallisable n-alkyl maleate and itaconate monoesters
Richard, Jean-Victor,Delaite, Christelle,Riess, Gérard,Schuller, Anne-Sophie
, p. 136 - 143 (2015/12/26)
Homologous series of crystallisable C8-C22 even-numbered alkane oligomers with either maleate or itaconate monoesters end-groups were synthesized. Their total phase change enthalpy (ΔHtpce) and entropy (ΔStpce) on melting, determined by DSC, show a linear dependence with the number of carbons of the alkyl chain. A comparison was performed with corresponding succinate derivatives. The influence of the end functions on ΔStpce was examined in view of ΔStpce values estimated by the group additivity approach. A fair agreement between the experimental and the estimated entropy values could be demonstrated. Thermogravimetric analysis (TGA) has shown that the maleate oligomers are less stable than the corresponding succinate and itaconate derivatives. This behaviour could be confirmed by the activation energies of the degradation process.
Epoxidation of monomaleate with hydrogen peroxide catalyzed by [π-C 5H5N(CH2)15CH3] 3PO4(WO3)4
Zhang, Zhiliang,Li, Tianduo
experimental part, p. 3417 - 3423 (2011/10/04)
In the study, epoxidation of dodecanol monomaleate, hexadecanol monomaleate, and octadecanol monomaleate were carried out using [π-C 5H5N(CH2)15CH3] 3PO4(WO3)4 as phase-transfer catalyst with 30% hydrogen peroxide as oxidant. The experimental results showed that [π-C5H5N(CH2)15CH 3]3PO4(WO3)4 had excellent catalytic effect on translating C=C double-bond into an epoxy group and had a good yield rate. The synthesized epoxides of decanol monomaleate, hexadecanol monomaleate, and octadecanol monomaleate have enormous potential application in organic synthesis, and they could be readily transformed into various synthetically useful intermediates or final products in many fields of chemistry.
