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20 September 2018, Volume 48 Issue 9 Previous Issue    Next Issue

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Carbon quantum dot-doped worm-like micelles SUN Xiao-feng,LI Hong-guang 2018, 48 (9):  483-488.  doi: 10.13218/j.cnki.csdc.2018.09.001 Abstract ( 293 )   PDF (4680KB) ( 264 )   Carbon quantum dots (CQDs) with carboxyl groups were prepared by acid reflux method and using fullerene carbon soot as raw material.CQDs can form worm-like micelles with tetradecyldimethylamine oxide (C14DMAO) in aqueous solution when the CQDs replaced the traditional organic acid.The effects of CQDs mass concentration and pH on the rheological properties of worm-like micelles were investigated.It is found that both a higher mass concentration of CQDs and a lower pH will facilitate the formation of worm-like micelles.The worm-like micelles and CQDs can be observed in situ by cryo-TEM.The dissociation of H+ from CQDs could protonate C14DMAO into C14DMAOH+.The hydrogen bond formed between C14DMAOH+ and C14DMAO is the main driving force for the formation of worm-like micelles.The results above show that CQDs can effectively induce C14DMAO to form worm-like micelles. References | Related Articles | Metrics

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Efficacy evaluation of cosmetics (Ⅷ) The application of 3D reconstructed skin models in the evaluation of cosmetic efficacy LI Xiao, ZHANG Xiao-e, LU Yong-bo, JIN Yan 2018, 48 (9):  489-494.  doi: 10.13218/j.cnki.csdc.2018.09.002 Abstract ( 775 )   PDF (6148KB) ( 613 )   The application of 3D reconstructed skin models in cosmetics efficacy evaluation was summarized.Types of 3D reconstructed skin models,and main in vitro efficacy evaluation methods based on these innovative models were introduced.The 3D reconstructed epidermis model is developed from keratinocytes and mainly used to test the efficacy such as skin barrier function,moisturizing,anti-inflammatory,UV protection,and skin penetration.The 3D reconstructed pigmented skin model is composed of keratinocytes and melanocytes,which is mainly used for skin whitening efficacy testing.Moreover,the 3D full-thickness skin model is composed of keratinocytes and fibroblasts,and widely used to study anti-aging efficacy.With these 3D skin models,multi-dimensional detection results can be obtained to achieve a comprehensive evaluation of the cosmetic efficacy. References | Related Articles | Metrics

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Synthesis and properties of quaternary ammonium Gemini surfactants m-n-m DONG Le, GE Xiu-juan, GAO Wen-chao, LI Xing, WEI Wen-long, CHANG Hong-hong 2018, 48 (9):  495-499.  doi: 10.13218/j.cnki.csdc.2018.09.003 Abstract ( 472 )   PDF (3409KB) ( 266 )   A quaternary ammonium Gemini surfactant (14-8-14) was synthesized from N,N-dimethyl tetradecylamine and 1,8-dibromooctane.The optimum reaction condition was obtained by single factor experiment.The optimum synthesis condition was as follows:the dosage of N,N-dimethyl amine was 5 mmol;the molar ratio of n(N,N-dimethyl amine)∶n(dibromoalkane) was 2.2∶1;10 mL acetonitrile was used as solvent;the reaction temperature was 80 ℃;and the reaction time was 24 h.24 kinds of quaternary ammonium Gemini surfactants m-n-m were synthesized under this condition,most of which had a yield larger than 80%.The surface tension of the products were determined.The effects of the hydrophobic alkyl chain and the spacer on the surface activity of Gemini surfactants were studied.The results show that,for the same spacer n,the surface tension of Gemini surfactants first decreases and then increases with the increase of hydrophobic alkyl chain length (m>10).14-n-14 Gemini surfactants exhibit the best surface activity.Moreover,when the hydrophobic alkyl chain m=14,the surface tension of Gemini surfactants first increases and then decreases with the increase of the spacer length n. References | Related Articles | Metrics

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A comparative study on the thickening and foam-stabilizing properties of alkanolamide nonionic surfactants HU Xue-yi,TAN Jie,FANG Yun,LI Jun-guo,SUN Yang,LI Hua-shan 2018, 48 (9):  500-504.  doi: 10.13218/j.cnki.csdc.2018.09.004 Abstract ( 330 )   PDF (4140KB) ( 374 )   A comparative study was conducted among a lab-made palm kernel acid N-methyl monoethanolamide (PNMEA) and two commercial counterparts derived from diethanolamine (PDEA) and monoethanolamine (PMEA) on their properties as thickeners and foam boosters.The effects of PNMEA,PDEA and PMEA on the properties (including the flow pattern,thixotropy,elastic modulus and viscous modulus,etc) of a model shower gel were studied,in which sodium laureth-3 sulfate was used as the key component of the formula.The experimental results show that the apparent viscosity of PNMEA itself is lower and less temperature sensitive than that of PDEA;the model shower gels thickened by the three alkanolamides are all pseudoplastic non-Newtonian fluids and their thixotropies are very weak,and they behave like viscous fluid and elastic fluid at lower and higher shear frequencies,respectively;the three alkanolamides have similar foam-boosting and foam-stabilizing properties for the model shower gel.The thickening effect of PNMEA is superior to that of PDEA and similar to that of PMEA,but the apparent viscosity of the model shower gel thickened by PNMEA is less temperature sensitive than by PMEA.Therefore PNMEA is overall the best thickener among the three alkanolamides.Based on the comprehensive evaluation of safety,thickening property and foam-stabilizing property,PNMEA has advantage over PDEA and PMEA to become the dominant member in alkanolamides. References | Related Articles | Metrics

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Synthesis and performance study of ethoxylated methyl oleate sulfonate DING Li-rong,SUN Yong-qiang,ZHOU Jing-jie,ZHANG Yong,SUN Jin-yuan,LIANG Hui-bin 2018, 48 (9):  505-510.  doi: 10.13218/j.cnki.csdc.2018.09.005 Abstract ( 309 )   PDF (5233KB) ( 255 )   The ethoxylated methyl oleate sulfonate (OMEES) was synthesised by one-step sulfonation with sodium bisulfite from ethoxylated methyl oleate (OMEE) as a raw material,and the structure of the synthesized product was confirmed by the saponification value,iodine value,anion content and the infrared spectroscopy.The equilibrium surface tension,dynamic surface tension,dynamic contact angle and the main application performance were measured for OMEES and OMEE.The results show that as the γcmc is 36.3 mN/m,OMEES has slower adsorption rate and less adsorption capacity,and the wettability improves gradually with the increase of the surfactant concentration.The introduction of sulfonic acid groups increases the hydrophilicity of the raw material and enhances its foaming ability. References | Related Articles | Metrics

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Study on the interactions between a novel sugar-based cationic surfactant and bovine serum albumin ZHI Li-fei,WANG Xiu-wen,LI Xiao-ming,CHEN Hui,XUE Yong-bing,ZHANG Qing-hua 2018, 48 (9):  511-515.  doi: 10.13218/j.cnki.csdc.2018.09.006 Abstract ( 345 )   PDF (3838KB) ( 246 )   The interactions between a sugar-based cationic surfactant N,N-dimethyl-N-[3-(gluconamide)]propyl-N-tetradecylammonium bromides (C14DGPB) and bovine serum albumin (BSA) were investigated by fluorescence and three-dimensional fluorescence spectroscopy.The effects of various factors on the interactions between C14DGPB and BSA were investigated.The results show that the optimal conditions for interactions between C14DGPB and BSA were the action time 30 min,0.03 mol/L NaCl and pH=6.6.The dynamic quenching constants,binding parameters and thermodynamic parameters of C14DGPB with BSA at different temperatures can be obtained by calculation.According to the thermodynamic parameters,it shows that the hydrophobic interaction has played dominant roles in the interactions between C14DGPB and BSA,which has a great influence on the hydrophobic microenvironment of tyrosine and tryptophan. References | Related Articles | Metrics

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Synthesis of di-alkylated diphenyl ether catalyzed by ionic liquids BAI Long,LIU Xiao-chen,WANG Xiao-peng,HUO Yue-qing,NIU Jin-ping 2018, 48 (9):  516-520.  doi: 10.13218/j.cnki.csdc.2018.09.007 Abstract ( 291 )   PDF (3124KB) ( 240 )   The ionic liquid Et3NHCl-AlCl3 was used to catalyze the alkylation of diphenyl ether with 1-dodecene to synthesize di-dodecyl diphenyl ether.When the molar ratio of diphenyl ether/1-dodecene was 1∶3 (0.3 mol diphenyl ether),the optimized conditions of alkylation reaction obtained by orthogonal experimental method were catalyst dosage of 0.045 mol,reaction temperature of 70 ℃ and reaction time of 1 h.The conversion of diphenyl ether reaches 98.1% and the selectivity is 33.7% under such optimized conditions.The influences of catalyst structure on its catalytic activity were also investigated by changing the structure of the cationic and anionic parts of ion liquids.The results show that the catalytic activity is determined by the structure of the anion,and the best catalyst is Et3NHCl-AlCl3. References | Related Articles | Metrics

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Study on preperation and efficacyevaluation of herbal compound material for promoting hair growth GAO He-yi, HUANG Jian-cong, LEI Deng-feng, CHEN Zhi-jie, LIANG Qin-zhi, ZENG Sa 2018, 48 (9):  521-526.  doi: 10.13218/j.cnki.csdc.2018.09.008 Abstract ( 380 )   PDF (9161KB) ( 128 )   The fresh ginger,polygonum multiflorumthunb and angelica sinensis were prepared and formulated into a new raw material according to a specific ratio.The model of 5α-reductase inhibition,anti-oxidant property and animal test were conducted for its promoting hair growth and reducing hair loss efficacy.The results show that this material can inhibit the activity of 5α-reductase in vitro and have a certain ability to scavenge DPPH free radical.It can obviously promote hair growth at volume fractions of 10% and 30% in animal study.In conclusion,it is preliminarily proved that the new raw material can prevent hair loss and promote hair growth,and can be used for the development of hair growth products. References | Related Articles | Metrics

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Application of liquid chromatography-mass spectrometry in the analysis of prohibited substances in cosmetics TAN Ju-ying,YAN Qi-shuang,WANG Juan,SUN Yu,ZHU Jian-ping,LU Ri-gang 2018, 48 (9):  527-533.  doi: 10.13218/j.cnki.csdc.2018.09.009 Abstract ( 278 )   PDF (6487KB) ( 262 )   This article described the key technologies in liquid chromatography-mass spectrometry (LC-MS) analysis including:sample pretreatment technology,commonly used mass analyzers,matrix effect elimination method,qualitative and quantitative determination.Application ofLC-MS technology in the determination of prohibited components in cosmetics was reviewed.It is pointed out that the detection of components of prohibited substances in cosmetics has been progressed from single component to multi-component.More simple sample preparation techniques,and high-throughput,high-resolution,high-accuracy mass analysis techniques have been applied to the detection of prohibited substances in cosmetics. References | Related Articles | Metrics

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Research progress on aggregation behaviors of novel surface active ionic liquids WU Guo-peng,HOU Zhao-wei,WU Ao-li,ZHENG Li-qiang,SUN Ji-chao 2018, 48 (9):  534-540.  doi: 10.13218/j.cnki.csdc.2018.09.010 Abstract ( 252 )   PDF (6997KB) ( 64 )   The structures,properties,aggregation behaviors and practical applications of novel surface active ionic liquids that have emerged in recent years have been reviewed based on the designability and functionalization of ionic liquids.Zwitterionic surface active ionic liquids,responsive surface active ionic liquids,and chiral surface active ionic liquids have been mainly introduced in the review. References | Related Articles | Metrics

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Determination of N,N-dimethyl-1,3-propanediamine in amphoteric surfactants by pre-column derivatization high performance liquid chromatography LEI Xiao-ying, SHI Li-wen, XU Kun-hua, GE Zan, YANG Hai-qing, WANG Jing 2018, 48 (9):  541-544.  doi: 10.13218/j.cnki.csdc.2018.09.011 Abstract ( 421 )   PDF (2507KB) ( 271 )   To establish a method for the determination of N,N-dimethyl-1,3-propanediamine (DMAPA)in amphoteric surfactants by HPLC,the influence of derivatization conditions and chromatographic conditions on DMAPA detection was investigated.The results show that under alkaline condition,DMAPA in amphoteric surfactants reacts with phenyl isothiocyanate (PITC)to form phenylurea derivatives.The DMAPA derivative is separated from other components by a phenyl column with acetonitrile gradient elution and UV detection at 254 nm.The linear correlation coefficient of the standard solution is 0.999 3.The recovery rate of the sample is good,and the average recovery is 95.9%-101.8%.This method can meet the requirements of quality analysis. References | Related Articles | Metrics