2016-45-7Relevant academic research and scientific papers
Synthesis and application exploration of novel gemini surfactant
Wu, X.I.-Yuan,Wang, Hui,Wang, Gui-Rong
, p. 609 - 612 (2015)
A novel gemini surfactant dichloride- N,N,N′,N′-tetramethyl-N,N′-dicetyl-2-propanol-1,3-ammonium (DTDPA) with two hydrocarbon chains connected by hydroxyl spacer chain was synthesized by three steps reactions. The values that characterized the solution properties of gemini surfactant including critical micelle concentrations (cmc), γcmc, pC20 and cmc/C20 were measured. The results demonstrated that the gemini surfactant gave low cmc, great efficiency in lowering the surface tension and strong adsorption at air/water interface. The application of DTDPA in the field of enhanced oil-recovery (EOR) technology and suspension copolymerization was investigated. DTDPA can reduce the interfacial tension of crude oil-water system sharply and maintain the viscosity of surfactant-PAM system excellently. The addition of DTDPA as assistant dispersant system can promote the oil absorption capacity of resin prepared by suspension copolymerization method within a range of concentration and reduce the oil absorption balanced time as increasing concentration of gemini surfactant.
Amphiphilic chitosan derivatives-based liposomes: Synthesis, development, and properties as a carrier for sustained release of salidroside
Peng, Hailong,Li, Wenjian,Ning, Fangjian,Yao, Lihua,Luo, Mei,Zhu, Xuemei,Zhao, Qiang,Xiong, Hua
, p. 626 - 633 (2014)
A novel amphiphilic chitosan derivative of N,N-dimethylhexadecyl carboxymethyl chitosan (DCMCs) was synthesized. The structure of DCMCs was confirmed via FT-IR and 1H NMR, and the critical micelle concentration (CMC) was investigated by fluorescence spectroscopy. The results indicated that DCMCs has hydrophilic carboxyl and hydrophobic methylene groups and the CMC value was 23.00 mg·L-1. The polymeric liposomes (DCMCs/cholesterol liposomes, DC-Ls) were developed, and its properties were evaluated. The DC-Ls exhibited multilamellar spheres with positive charge (+73.30 mV), narrow size distribution (PDI = 0.277), and good crystal properties. Salidroside was first to encapsulate into DC-Ls. Compared with traditional liposomes (phosphatidylcholine/cholesterol liposome, PC-Ls), DC-Ls showed higher encapsulation efficiency (82.46%) and slower sustained release rate. The in vitro salidroside release from DC-Ls was governed by two distinct stages (i.e., burst release and sustained release) and was dependent on the pH of the release medium. The case II transport and case I Fichian diffusion were the main release mechanisms for the entire release procedure. These results indicated that DC-Ls may be a potential carrier system for the production of functional foods that contain salidroside or other bioactive food ingredients.
