Table of Content

22 August 2019, Volume 49 Issue 8 Previous Issue    Next Issue

Basic research

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Study on the properties of the mixtures of sodium fatty alcohol ether sulfate with narrow ethylene oxide distribution and tetradecyltrimethylammonium bromide WANG Xin-gang,YANG Xiao-yi,SUN Yong-qiang,GUO Chao-hua,LI Ping,LI Jian-bo 2019, 49 (8):  485-491.  doi: 10.3969/j.issn.1001-1803.2019.08.001 Abstract ( 294 )   HTML ( 87 )   PDF (1238KB) ( 512 )   Sodium fatty alcohol ether sulfate with narrow ethylene oxide distribution（N-AEmS）was synthesized by sulfating the fatty alcohol ether with narrow ethylene oxide distribution with gaseous sulfur trioxide（SO3）as a sulfating agent. The structure of N-AEmS（m=3, 5, 7, 9）was characterized by FT-IR and 1H NMR. The properties of N-AEmS, tetradecyltrimethylammonium bromide（TTAB）and the mixed systems of N-AEmS/TTAB（m=3, 5, 7, 9）were investigated by measuring the static surface tension, contact angle and dynamic surface tension. The results indicate that the mixed systems of N-AEmS/TTAB（m=3, 5, 7）show higher surface activity compared with AEmS and TTAB. N-AE9S almost shows no synergistic effect with TTAB due to its high number of EO groups. The diffusion performances of the N-AEmS/TTAB（m=3, 5, 7, 9）systems are almost unchanged compared with that of N-AEmS（m=3, 5, 7, 9）, and both are mixed diffusion-kinetic controlled adsorption mechanism. Figures and Tables | References | Related Articles | Metrics

Lecture of science and technology

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Interactions between surfactants and nanoparticles and the construction of smart systems（II）Interaction of the nanoparticle with an oppositely charged ionic surfactant（i） Construction of switchable Pickering emulsions and Pickering foams via switch transference CHEN Zhao,JIANG Jian-zhong,CUI Zheng-gang 2019, 49 (8):  492-502.  doi: 10.3969/j.issn.1001-1803.2019.08.002 Abstract ( 550 )   HTML ( 8 )   PDF (2822KB) ( 532 )   Colloidal particles with surfaces partially wetted by water and oil are surface active, which can adsorb at oil（air）/water interface to stabilize Pickering emulsions and Pickering foams. Most of inorganic nanoparticles are charged in aqueous media which are not or less surface active due to the strong hydrophilicity. A simple method to make them surface active is to add trace amount of oppositely charged ionic surfactant into the aqueous dispersions of the particles, which will adsorb at particle/water interface via electrostatic interaction to form a hydrophobic monolayer at particle surface, so that the hydrophobicity of the particles is significantly increased. This interaction is called hydrophobization in situ. In this lecture we will discuss how to make inorganic nanoparticles surface active via hydrophobization in situ and how to transfer the switch of a surfactant to particles by particle/surfactant interaction to construct switchable Pickering emulsions and switchable Pickering foams. Figures and Tables | References | Related Articles | Metrics

Development and application

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Study on water-in-oil Pickering emulsion stabilized by magnetic responsive calcium alginate microspheres YANG Xin,SUN He-jia,WANG Wei-hao,WANG Yao-lei,QIU Zhong-ping,MENG Tao 2019, 49 (8):  503-507.  doi: 10.3969/j.issn.1001-1803.2019.08.003 Abstract ( 684 )   HTML ( 36 )   PDF (1992KB) ( 379 )   Calcium alginate microspheres internally encapsulated with Fe3O4 nanoparticles were prepared by emulsion gel method. The surface of the microspheres was coated with hydrophobically modified titanium dioxide nanoparticles and dispersed well in hexane. Due to the coating of alkyl silane-modified titanium dioxide nanoparticles, calcium alginate microspheres can be used to stabilize the water-in-oil Pickering emulsion. By optimizing the calcium alginate microsphere content, the particle size of Pickering emulsion can be adjusted. Additionally, the microsphere-stabilized Pickering emulsion can be oriented and magnetically demulsified under the action of an external magnetic field. Figures and Tables | References | Related Articles | Metrics

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Study on preparation and stability of W/O/W Pickering emulsion LUO Zheng-zhe,YANG Cheng 2019, 49 (8):  508-514.  doi: 10.3969/j.issn.1001-1803.2019.08.004 Abstract ( 723 )   HTML ( 30 )   PDF (1134KB) ( 830 )   The factors on the stability of W/O/W Pickering emulsions stabilized by modified silica were studied. W/O/W Pickering emulsions were prepared using two kinds of silica through different methods, i.e., one-step emulsification method and two-step emulsification method. The structure of the emulsion was observed by microscopy. The results showed that W/O/W Pickering emulsion prepared by two-step emulsification method was better than the one prepared by one-step method. The effects of oil-water volume ratio and particle mass fraction on the storage stability of emulsions were studied through the single factor experiments. The optimal condition is that the mass fraction of hydrophobic silica is 4%, the oil-water volume ratio is 6∶4, the mass fraction of hydrophilic silica is 5%, and the water-W/O emulsion volume ratio is 8∶2. The effects of pH value and salinity on the stability of emulsions were also studied by measuring the zeta potential of the silica surface under different conditions. The results showed that salinity has a negative effect on the stability of W/O/W emulsions while W/O/W emulsions are stable when pH value is around 6. When pH value is over 7, the emulsification ability of silica is decreased, which is detrimental to the stability of emulsions. Figures and Tables | References | Related Articles | Metrics

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Preparation and bactericidal properties of potassium peroxymonosulfate disinfectant WANG Zhan-yin,GAO Wen-jun,WEI Gang,ZHANG Zheng-ming 2019, 49 (8):  515-518.  doi: 10.3969/j.issn.1001-1803.2019.08.005 Abstract ( 573 )   HTML ( 7 )   PDF (741KB) ( 512 )   A non-chlorine potassium peroxymonosulfate disinfectant was prepared. The disinfectant was prepared with potassium peroxymonosulfate as the main component and amino sulfonic acid and surfactant as the auxiliary materials. The stability of the sample aqueous solution was investigated by detecting the peroxide concentration of the sample aqueous solution for 0-6 hours, and the formula of disinfectant was determined by orthogonal test. The germicidal efficacy had been done against Escherichia coli, Staphylococcus aureus and Candida albicans. The results show that the peroxide concentration in 1% aqueous solution is stable within 6 hours. Under the condition of（20±1） ℃ water bath, the mean killing logarithmic values of 1% aqueous solution to Eescherichia coli and Staphylococcus aureus for 5 min are greater than 5.00; the mean killing logarithmic values of 2% aqueous solution acting on Candida albicans for 10 min are greater than 4.00. The active components of the non-chloride disinfectant prepared by potassium peroxymonosulfate and sulfamic acid are stable in aqueous solution and have ideal killing effect. Figures and Tables | References | Related Articles | Metrics

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Preparation, characterization and application of lavender fragrance nanocapsules YU Lin-lin,XIE Xing-hui,SHI Xiao-di,LI Xue-ting,LU Xi-hua 2019, 49 (8):  519-525.  doi: 10.3969/j.issn.1001-1803.2019.08.006 Abstract ( 359 )   HTML ( 6 )   PDF (1731KB) ( 352 )   The lavender fragrance nanocapsules were successfully prepared via the interfacial polymerization method using polyurea as the wall material to coat the lavender oil. Transmission electron microscope（TEM）images reveal that the nanocapsules possess regular spherical morphology with distinct core-shell structure, indicating that lavender oil is well encapsulated in the nanocapsules. And particle size distribution analysis shows that the average particle size of the lavender nanocapsules is approximately 131.7 nm with particle size distribution PDI of 0.16. Fourier transform infrared spectroscopy（FT-IR）and ultraviolet-visible analysis also show that the lavender oil can be well encapsulated inside the nanocapsules and the encapsulation efficiency of the nanocapules is as high as 96.5%. The thermal gravimetric analysis（TGA）and high temperature sustained-release curves indicate that the lavender oil encapsulated in the nanocapsules began to volatilize at 150 ℃ with good thermostability and sustained-release properties. Additionally, cotton fabrics treated with the fragrance nanocapsules display good washability after 150 min of soaping. Figures and Tables | References | Related Articles | Metrics

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Efficacy evaluation of Mirabilis jalapa flower extract on promoting collagen functionalization LI Hui,JIANG Dan-dan,DOS SANTOS Morgan,ZHANG Zhang,JIANG Yao-quan 2019, 49 (8):  526-530.  doi: 10.3969/j.issn.1001-1803.2019.08.007 Abstract ( 703 )   HTML ( 11 )   PDF (1053KB) ( 494 )   Human dermal fibroblasts were cultured in vitro, and enzyme-linked immunosorbent assay（ELISA）combined with cell activity assay was used to determine the secretion of BMP-1, which plays an important role in collagen functionalization. The measurement timepoint and positive control of the assay model were optimized. Based on the standardized assay model, the efficacy of Mirabilis jalapa flower extract on BMP-1 synthesis was evaluated. The results show that when treated with Mirabilis jalapa flower extract at 0.05 g/L, the relative BMP-1 content of the fibroblasts is 150.4%±8.5% compared with the control group（P<0.001）. Therefore, the Mirabilis jalapa flower extract can significantly promote the production of BMP-1 from dermal fibroblasts, and has the great potential in skincare effect of promoting collagen functionalization. Figures and Tables | References | Related Articles | Metrics

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Protective effects of bilobalide and ginkgolides B on oxidative damage in human keratinocytes induced by H2O2 XIONG Li-dan,TANG Jie,LI Li 2019, 49 (8):  531-536.  doi: 10.3969/j.issn.1001-1803.2019.08.008 Abstract ( 336 )   HTML ( 4 )   PDF (1219KB) ( 443 )   Different concentrations of bilobalide and ginkgolides B were added to H2O2-stimulated HaCaT model. Cell viability was determined by CCK-8 method, superoxide dismutase（SOD）activity was determined by WST staining method, glutathione（GSH）activity was measured by DTNB, malondialdehyde（MDA）content was detected by lipid oxidation kit. The content of ROS was investigated via DCFH-DA method. And ELISA assays were adopted to investigate the production of TNF-α, IL-1β, and IL-6. To better understand the mechanism of the efficacy of bilobalide and ginkgolides B, TCM database（IUPHAR/BPS Guide to Pharmacology and String）was used to predict common targets of drugs. The results show that bilobalide and ginkgolides B can increase the SOD and GSH-Px activity, decrease MDA and ROS content induced by H2O2, and reduce the production of the pro-inflammatory cytokines TNF-α, IL-1β and IL-6 in H2O2-induced HaCaT cells. The drug discovery database shows that the anti-inflammatory effect of bilobalide and ginkgolides B has the characteristics as multi-molecular, multi-target and multi-pathway. Figures and Tables | References | Related Articles | Metrics

Reviews

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Molecular simulations for aggregation behavior of surfactant molecules at oil/water interface GENG Tie,ZHAO Chun-hua,LIU Xue-jing,SU Long,ZHENG Li-qiang,SUN Ji-chao 2019, 49 (8):  537-544.  doi: 10.3969/j.issn.1001-1803.2019.08.009 Abstract ( 399 )   HTML ( 10 )   PDF (1597KB) ( 377 )   Recent studies on the aggregation behavior of surfactant molecules at oil/water interface using molecular simulations were reviewed, including anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants and mixed surfactant systems. The relevant theoretical guidance was expected to be meaningful for the basic research on the aggregation behavior of surfactant molecules, the design of novel surfactants and the optimization of surfactant application in enhanced oil recovery. Figures and Tables | References | Related Articles | Metrics

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Progress on the research of supra-amphiphiles LI Shuang-yang,YE Hong 2019, 49 (8):  545-550.  doi: 10.3969/j.issn.1001-1803.2019.08.010 Abstract ( 865 )   HTML ( 7 )   PDF (917KB) ( 713 )   Supra-amphiphiles have been discovered for several years as a new type of amphiphiles,which have the advantages of controllability,high efficiency and so on. Supra-amphiphiles consist of two amphiphile molecules linked by non-covalent bonds or dynamic covalent bonds. The non-covalent bonds include host-guest interaction,electrostatic interaction,π-π stacking interaction and charge transfer interaction. According to the different responsive characteristics,the pH response,photoresponse,redox response,enzyme response and multiple response were also introduced. Supra-amphiphile is a new bond between colloid chemistry and supramolecular chemistry. It is very important for the development of novel self-assembly functional materials. Figures and Tables | References | Related Articles | Metrics

Analytical methods and testing

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Determination of 8-hydroxyquinoline in cosmetics by HPLC LI Ya-nan,HAN Xiao-ping,ZHOU Pei 2019, 49 (8):  551-554.  doi: 10.3969/j.issn.1001-1803.2019.08.011 Abstract ( 399 )   HTML ( 10 )   PDF (836KB) ( 391 )   A method for the determination of 8-hydroxyquinoline in different types of cosmetics by high performance liquid chromatography（HPLC）was established. 8-Hydroxyquinoline was dissolved in methanol, and then separated by SHISEIDO C18（4.6 mm×250 mm, 5 μm）column using 0.1% formic acid and methanol or 0.1% phosphoric acid and methanol as mobile phase with isocratic elution, with the detection wavelengths at 254 nm. Compared with the standard method, the mobile phase in this study used formic acid or phosphoric acid instead of sodium decane-1-sulfonate to avoid the peak of hydroxyquinoline salt in the chromatogram of the reference substance. The calibration curves show good linear relationship in the range of injection volume and the correlation coefficients are above 0.999. The average recoveries spiked at 80%, 100%, 120% are in the range of 96.9%-112.9% with RSD of 0.20%-2.55%（n=9）. The established method is simple, reliable, and has high sensitivity and reproducibility. The method can be used for determing the content of 8-hydroxyquinoline in cosmetics. Figures and Tables | References | Related Articles | Metrics