Table of Content

22 July 2018, Volume 48 Issue 7 Previous Issue    Next Issue

Basic research

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The surface activity study of divalent salts of perfluorinated carboxylic acids(PFA) and the mixtures of PFA/trivalent metal salts XIAO Zi-bing,DOU Zeng-pei,HE Ting,XING Hang,XIAO Jin-xin 2018, 48 (7):  363-370.  doi: 10.13218/j.cnki.csdc.2018.07.001 Abstract ( 234 )   PDF (5805KB) ( 254 )   A series of divalent salts (M(PFOA)2 and M(PFBA)2,M2+=Mg2+,Ca2+,Sr2+,Ba2+) of perfluorooctanoic acid (PFOA) and perfluorobutanoic acid (PFBA) were synthesized,whose surface activities in water,dimethyl sulfoxide (DMSO) and ethylene glycol (EG) were studied.The aqueous solutions of perfluorinated carboxylic acids (i.e.PFOA and PFBA) mixed with trivalent metal salts were also investigated by surface tension measurement.The results show that the surface activities of M(PFOA)2 and M(PFBA)2 are higher than that of potassium perfluorooctanoate (PFOK) and potassium perfluorobutanoate (PFBK),respectively,in all of the three solvents.But the surface tension of the mixtures of PFOA (or PFBA) and trivalent metal salts show no improvement compared with that of PFOA (or PFBA) alone.M(PFOA)2 has shown the potential of reducing the usage amount of PFOA salts in application. References | Related Articles | Metrics

Lecture of science and technology

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Efficacy evaluation of cosmetics (Ⅶ) Application of cell biology in efficacy evaluation of cosmetics GUO Li-qun, WANG Min 2018, 48 (7):  371-377.  doi: 10.13218/j.cnki.csdc.2018.07.002 Abstract ( 680 )   PDF (6678KB) ( 586 )   The applications of cell biology in cosmetics efficacy evaluation were summarized and the current mainstream research techniques in cell biology in the aspects of cosmetic moisturizing, whitening, anti-aging, and anti-pollution were introduced. The new idea of in vitro alternative methods to evaluate cosmetic safety and efficacy was proposed and look forward to new trends in the development of in vitro cell-based evaluation methods. References | Related Articles | Metrics

Development and application

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Synthesis and properties of ethyl-Nα-lauroyl-L-arginate·HCl KE Hui-chun,GENG Tao,JIANG Ya-jie,ZHANG Chun-qiao,JU Hong-bin,WANG Ya-kui 2018, 48 (7):  378-381.  doi: 10.13218/j.cnki.csdc.2018.07.003 Abstract ( 328 )   PDF (3471KB) ( 274 )   Ethyl-Nα-lauroyl-L-arginate·HCl (LAE) was synthesized from lauric acid,L-arginine ethyl ester dihydrochloride,N,N′-dicyclohexylcarbodiimide and triethylamine.The structure of product was characterized by IR and the properties of the product were measured,such as surface activity,foaming power,wetting power,emulsifying property and antibacterial activity.The results show that the cmc of the product is 3 mmol/L,γcmc is 32.42 mN/m;the foaming power is 285 mL in high purity water;the contact angle at the paraffin film/air/water interface is 50.2°;after mixed with liquid paraffin,the average time required for separating 10 mL water out from the bottom phase is 378.14 s;the bacteriostasis rate for selected microorganisms is above 90% at the mass concentration of 30 mg/L of LAE;compared with cetyltrimethylammonium bromide (CTAB),LAE has better emulsifying and wetting properties. References | Related Articles | Metrics

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Study on the control of SAPO-34 crystal morphology by the surfactant HE Zu-guang,LI Xiao-feng,DI Chun-yu,LI Zhi-hong,GUO Yun-ya,DOU Tao 2018, 48 (7):  382-387.  doi: 10.13218/j.cnki.csdc.2018.07.004 Abstract ( 261 )   PDF (11329KB) ( 45 )   The layered and small crystals of SAPO-34 molecular sieve were synthesized by adding a certain amount of octadecyltrimethylammonium bromide (STAB) and using pseudoboehmite as aluminum source,phosphoric acid as phosphorus source,silica sol as silicon source,and triethylamine and tetraethylammonium hydroxide as templates.The samples were characterized by XRD,SEM,FT-IR,NH3-TPD and BET.The catalytic performances of these samples for converting methanol to olefins (MTO) were also evaluated.Results show that,due to the presence of STAB,a specific organic sequence is formed in the reaction and therefore the particle size becomes smaller and thinner and the content of strong acid increases slightly.In contrast with the molecular sieve samples prepared by traditional methods,it has higher catalytic lifetime and selectivity to ethylene and propylene. References | Related Articles | Metrics

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Catalytic synthesis of mono and diethylene glycol butyl ether acetate from n-butyl acetate in stationary bed ZHANG Jin-chang,LI Tie-chun 2018, 48 (7):  388-391.  doi: 10.13218/j.cnki.csdc.2018.07.005 Abstract ( 246 )   PDF (2943KB) ( 236 )   A layered double hydroxide (LDH) material whose structure was similar to that of hydrotalcite was synthesized by co-precipitation method.The prepared catalyst modified with arachidic acid was significantly different from the one before modification according to the characterization by FT-IR and N2 adsorption.The modified catalyst was applied in ethoxylation of butyl acetate with stationary bed reactor.The results show that,the conversion of butyl acetate is 24.7%,the selectivities of 1-EBAC and 2-EBAC are 17.6% and 12.8%,respectively.The modified catalyst shows distinctly enhanced reactivity.The content of target product is improved,and the distribution of the product is narrower as well. References | Related Articles | Metrics

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Exfoliation of layered double hydroxide and montmorillonite and their self-assembly DAI Lu-xun,LIANG Shao-bin,CHEN Yao,XIE Xiang-li,LI Cun-jun,WANG Lin-jiang 2018, 48 (7):  392-398.  doi: 10.13218/j.cnki.csdc.2018.07.006 Abstract ( 279 )   PDF (8999KB) ( 45 )   Organic montmorillonite (CTA-MMT) was prepared with the method of ion exchange by using calcium-montmorillonite as raw material,sodium fluoride as sodium agent and cetyltrimethylammonium bromide (CTAB) as organic modifier.Organic layered double hydroxide (MgAl-SDS-LDH) was synthesized by hydrothermal method by using the raw materials of magnesium nitrate,aluminum nitrate,sodium hydroxide and sodium dodecyl sulfonate (SDS).Sols of exfoliated CTA-MMT and exfoliated MgAl-SDS-LDH were obtained by exfoliation of CTA-MMT and MgAl-SDS-LDH in chloroform through ultrasonication.By mixing the two sols,montmorillonite/layered double hydroxide nanocomposite (MMT/LDH) was prepared by self-assembly of exfoliated products.The structures of CTA-MMT,MgAl-SDS-LDH and their exfoliated products were characterized by XRD and AFM.The thermal stability of MMT/LDH was characterized by thermogravimetric analysis.The results show that CTA-MMT and MgAl-SDS-LDH can be exfoliated in chloroform in merely 20 min.The average thicknesses of exfoliated CTA-MMT and exfoliated MgAl-SDS-LDH are about 9 and 8 nm,respectively.MMT/LDH is a self-assembling material which is assembled orderly by exfoliated CTA-MMT and exfoliated MgAl-SDS-LDH,and the structure of MMT/LDH is influenced by the content of exfoliated MgAl-SDS-LDH and exfoliated CTA-MMT.The interlayer spacing of MMT/LDH decreases with the increase of content of exfoliated CTA-MMT,from 2.59 nm (in the case of low content of CTA-MMT) to 1.82 nm (in the case of high content of CTA-MMT).Furthermore,the thermostability of MMT/LDH is better than that of pristine CTA-MMT or MgAl-SDS-LDH. References | Related Articles | Metrics

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Study of eco-friendly color-fadable chalk LI Zhong-ping,ZHANG Kai,DONG Zhen-yu,SUN Mei-rong,SUN Wen-hui,DONG Chuan 2018, 48 (7):  399-402.  doi: 10.13218/j.cnki.csdc.2018.07.007 Abstract ( 205 )   PDF (3393KB) ( 240 )   According to the performance indicators of chalks (the gloss and the effectiveness and time of color fading),the composition of chalks was optimized,such as benzoic acid,nerolin,surfactants,release agent and a series of color-fadable pigments.The optimized formula of the chalk thus obtained contains 53.7% benzoic acid,37.2% nerolin,3.3% pigment,3.3% sodium dodecyl benzene sulfonate and 2.5% calcium stearate. References | Related Articles | Metrics

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The effect of Chinese herbal anti-acne formula on pathogenic bacteria and exocrine enzyme of acne vulgaris HE Gai-ying,CHEN Di,SHEN Li 2018, 48 (7):  403-407.  doi: 10.13218/j.cnki.csdc.2018.07.008 Abstract ( 293 )   PDF (3792KB) ( 315 )   The antimicrobial efficacy of Chinese herbal anti-acne formula on Propionibacterium acnes (PA),Staphylococcus aureus (SA),and Staphylococcus epidermidis (SE) were investigated by susceptibility test and bacteriostatic test,and the bacteriostatic kinetics of it on these three bacterial were also examined.A transparent circle formed by lipase and protease hydrolysis substrate was used to study the effect of Chinese herbal anti-acne formula on the release of lipase and protease from PA.The results show that Chinese herbal anti-acne formula significantly inhibits PA,SA and SE in a time-and dose-dependent manner.The inhibitory effect of Chinese herbal anti-acne formula on lipase and protease mainly depends on inhibiting PA. References | Related Articles | Metrics

Reviews

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Antimicrobial mechanisms and applications of antimicrobial surfactants HE Tian-ying,YIN Xian,SUN Bo,ZHANG Peng,LIAO Yong-hong,WANG Feng-huan 2018, 48 (7):  408-414.  doi: 10.13218/j.cnki.csdc.2018.07.009 Abstract ( 442 )   PDF (6377KB) ( 361 )   The antimicrobial mechanisms and applications of cationic surfactants,anionic surfactants and biosurfactants were summarized.The applications of biosurfactants were mainly introduced and the trends of surfactants in the antibacterial field were prospected. References | Related Articles | Metrics

Analytical methods and testing

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Determination of 12 kinds of phthalates in cosmetics by HPLC CAI Xia,HUANG Yan-ting,FU Mei-yan,MENG Xiao,LIANG Qi 2018, 48 (7):  415-418.  doi: 10.13218/j.cnki.csdc.2018.07.010 Abstract ( 268 )   PDF (2882KB) ( 251 )   The chromatographic separation of 12 kinds of phthalates in cosmetics was achieved on an Agilent Poroshell 120 EC-C18(100 mm×4.6 mm,2.7 μm) filled with particles of sub-3 μm,with the mobile phase of methanol-acetonitrile-water by gradient elution,at the detection wavelength of 230 nm.The results indicate that 12 components are completely separated in 10 min,and the linear relationship is good in the range of 5.0-100 mg/L.The detection limits range from 1.0 mg/kg to 40.0 mg/kg,and the lower limits of quantitation range from 3.5 mg/kg to 150.0 mg/kg.The average recoveries are in the range of 89.4%-107.1%,and RSDs are in the range of 0.3%-1.5%. References | Related Articles | Metrics

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Comparison of determination of 6-methyl coumarin in cosmetics by HPLC-DAD and GC-FID LIU Hong,ZHANG Jing-ya,HU Bei,WEI Liu-zhen 2018, 48 (7):  419-422.  doi: 10.13218/j.cnki.csdc.2018.07.011 Abstract ( 264 )   PDF (2716KB) ( 250 )   To compare a high performance liquid chromatography with the diode array detector (HPLC-DAD) method and a gas chromatograph with the flame ionization detector (GC-FID) method for the determination of 6-methyl coumarin in cosmetics.Positive samples were confirmed by GC-MS.Methanol was used to extract 6-methyl coumarin from cosmetics,and the chromatographic conditions of the two methods were optimized.Samples were measured and the recoveries,precisions,correlation coefficients,detection limits,and quantitative limits of the two methods were compared.Results show that both of the two methods have good linear relationships in the range of their respective mass concentration.The recoveries of HPLC-DAD is between 92.20% to 102.80%,the RSD is between 0.77% to 2.00%,the detection limit is 0.05 mg/kg and the quantitative limit is 0.17 mg/kg.The recoveries of GC-FID is between 97.30% to 103.28%,the RSD is between 0.47% to 4.87%,the detection limit is 1.3 mg/kg and the quantitative limit is 5.0 mg/kg.HPLC-DAD method has a lower detection limit and higher sensitivity than GC-FID method,and has more advantages in determining low-content samples. References | Related Articles | Metrics