Table of Content

22 December 2018, Volume 48 Issue 12 Previous Issue    Next Issue

Basic research

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Comparative study on the interactions between ionic surfactants and bovine serum albumin WEN Feng, WANG Yun, HU Xiao-xi, CEN Guang-long, ZHANG Yan-jun, YIN Yan-zhen 2018, 48 (12):  665-674.  doi: 10.13218/j.cnki.csdc.2018.12.001 Abstract ( 459 )   PDF (8423KB) ( 71 )   A comparative study between two ionic surfactants,namely sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium bromide (DTAB),for their interactions with bovine serum albumin (BSA) has been made by measurement of fluorescence,ultraviolet absorption,dynamic light scattering and Zeta potential.The results show that,both SDS and DTAB can quench the intrinsic fluorescence of BSA.The quenching constantsKsv at 298 K are 2.64×104 and 304.21 L/mol,respectively.Synchronous fluorescence spectra and three-dimensional fluorescence spectra show that SDS and DTAB have influences on the conformation of BSA.The fluorescence quenching of BSA by SDS occurs through a mixed static and dynamic quenching mechanism.The thermodynamic parameters reveal that the electrostatic force dominates in the formation of the SDS/BSA complex.DTAB can quench the intrinsic fluorescence of BSA by dynamic quenching,in which the hydrophobic force is dominating.The average binding distance of SDS and DTAB to BSA are calculated to be 2.77 and 4.73 nm.With the combination of results of binding constants,particle size and Zeta potential,it can be concluded that SDS with larger charge density and smaller polar headgroup has stronger binding to BSA under the same conditions. References | Related Articles | Metrics

Lecture of science and technology

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Efficacy evaluation of cosmetics (Ⅹ)Scientific support for the claim of subjective efficacyof cosmetics YIN Yue-xuan, LI Cheng-tong, WANG Chun-xiao, ZHU Wen-jing, ZHAO Hua 2018, 48 (12):  675-679.  doi: 10.13218/j.cnki.csdc.2018.12.002 Abstract ( 394 )   PDF (6776KB) ( 451 )   Subjective claims such as the skin sensation in cosmetics use are mainly verified by sensory evaluation.Sensory evaluation experiment is a scientific method to arouse,measure,analyze and interpret the material characteristics and properties through visual,olfactory,gustatory,tactile,and auditory perceptions.The principle,environmental control,evaluation index,experimental procedure,reliability and validity test,evaluation method of cosmetic sensory evaluation were introduced.The application of sensory evaluation in different fields of cosmetics was described and the future development of cosmetic sensory evaluation was prospected. References | Related Articles | Metrics

Development and application

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Study on the self-thickening system of sodium lauroyl sarcosinate WANG Kuan, SUN Ji-long, LI Ze-yong 2018, 48 (12):  680-683.  doi: 10.13218/j.cnki.csdc.2018.12.003 Abstract ( 973 )   PDF (3414KB) ( 624 )   The systems of sodium lauroyl sarcosinate (LS) mixed with nonionic,anionic,and zwitterionic surfactants were studied.By changing the amount and the mixing ratios of these surfactants,it was found that,as for binary systems,synergistic thickening could be achieved by adding a small amount of alkyl polyglucoside (APG).In ternary systems,the mixing ratios of surfactants had significant influences on viscosity,and a self-thickening system of LS/cocamidopropyl betaine (CAB)/APG could be obtained.The viscosity of the mixture was no less than 3 000 mPa·s when the mass of CAB was not lower than LS.The popular silicone- and sulfate-free shampoos can use this self-thickening formulation as a reference. References | Related Articles | Metrics

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Preparation of molecularly imprinted polymers via sol-gel surface imprinting for selectiveadsorption of ellagic acid ZHI Ke-ke, XU Lu, ZHANG Ya-gang, WANG Lu-lu, YASIN Akram, ZHANG Le-tao 2018, 48 (12):  684-690.  doi: 10.13218/j.cnki.csdc.2018.12.004 Abstract ( 356 )   PDF (7130KB) ( 68 )   Molecularly imprinted polymers (MIPs) was prepared at room temperature using silica gel as the supporter,ellagic acid as the template molecule,3-aminopropyltriethoxysilane (APTES) as the functional monomer,and tetraethoxysilicane (TEOS) as the cross-linker.The surface morphology of MIP was characterized by SEM.The adsorption of ellagic acid onto MIP was evaluated by static adsorption experiment.The results indicate that the adsorption of ellagic acid on MIP can reach equilibrium within 40 min;the imprinting factor is 2.68;the saturated adsorption capacity is as high as 70 mg/g.In contrast to non-imprinted polymer (NIP),the MIP exhibits high selectivity and specific recognition towards ellagic acid.The results of nonlinear regression of adsorption data show that the adsorption kinetics and adsorption isotherms data of MIP fit well with pseudo-second-order kinetic model and Langmuir isotherm model,respectively.Furthermore,the adsorption capacity of MIP maintains above 90% after five regeneration cycles,indicative of excellent reusability.The prepared MIP can be severed as an excellent functional material for selective adsorption of ellagic acid,which has application potential for the separation and purification of ellagic acid in complex matrix. References | Related Articles | Metrics

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The performance test of fatty acid methyl ester sulfonate and its application in the liquiddetergent SONG Jin-yu, PENG Zhi-qiang, SUN Xiao-yu 2018, 48 (12):  691-694.  doi: 10.13218/j.cnki.csdc.2018.12.005 Abstract ( 335 )   PDF (3731KB) ( 295 )   The hydrolytic stability,foaming power and foam stability,lime soap dispersing power and Krafft point of fatty acid methyl ester sulfonate (MES) were measured by potentiometric titration,Ross-Miles foam instrument,improved acidometric titration and turbidimetric test,respectively.The stability and detergency of the liquid detergent containing MES were also tested.The results show that when the storage temperature is 45 ℃,MES is stable at pH 4.5-9.0,however,when pH is 10.0,the mass fraction of disodium salt ofα-sulfonated fatty acid (DS) increases,indicative of obvious hydrolysis;MES shows excellent lime soap dispersing power with a value of 2.5 g calcium soap per gram of MES (In contrast,the value for LAS is 0.34 g calcium soap per gram of LAS);The Krafft point of MES is approximately 20.9 ℃;The liquid detergent products containing MES have excellent stability,and the detergency performance can meet the requirements of the national standard. References | Related Articles | Metrics

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Research on image-based skin texture evaluation algorithm CHEN Wen-rui, CHEN Tian-hua, WANG Xiao-yi, XU Ji-ping, YU Jia-bin, WANG Ying-qiang 2018, 48 (12):  695-701.  doi: 10.13218/j.cnki.csdc.2018.12.006 Abstract ( 400 )   PDF (6872KB) ( 110 )   Quantitative evaluation of skin texture or micro-contour is of great significance for evaluating the efficacy of cosmetics against wrinkles.Skin texture,as one of the inherent characteristics of the skin,has a significant effect on skin quality.Based on the application requirements of skin beauty and the actual needs of daily life,the basic texture features of the skin were studied by the related algorithms in the field of image processing.Firstly,the experimentally measured skin image was transformed into a grayscale image.The image was then enhanced by contrast limited adaptive histogram equalization.Then the noise of the image was removed by Gauss filtering,and the details of the texture were enhanced by Wiener filtering.A clear texture of the skin image was obtained.The gray scale and distance of gray level co-occurrence matrix suitable for skin texture evaluation were determined through experiments.The skin texture was statistically analyzed based on gray level co-occurrence matrix algorithm.A mathematical model of comprehensive index based on four texture feature parameters was proposed,and the texture features of all skin images were quantitatively evaluated by using the model.Visual evaluation of these skin images was also conducted by experts.The two methods of evaluation are in good agreement. References | Related Articles | Metrics

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Study on catalytic synthesis of propyl cinnamate with p-toluenesulphonic acid supported onpolyaniline DING Bang-dong, YANG Rui-hong, DU Bin, LUO Zhi-chen, LIU Wei 2018, 48 (12):  702-705.  doi: 10.13218/j.cnki.csdc.2018.12.007 Abstract ( 270 )   PDF (3796KB) ( 241 )   Propyl cinnamate was prepared using cinnamic acid and propanol as raw materials andp-toluenesulphonic acid supported on polyaniline (PTSA/PANI) as catalyst.The effects of molar ratio of acid/alcohol,reaction time,and the number of times used and the dosage of catalyst on the yield of propyl cinnamate were investigated.The product was characterized by IR and1H NMR.The results show that PTSA/PANI has good catalytic activity and stability.The optimized conditions are as follows:0.15 mol (approximately 22.2 g) cinnamic acid;n(cinnamic acid)∶n(propanol)=1∶4.0;the catalyst used is in an amount corresponding to 6% of the mass of cinnamic acid;the amount of cyclohexane (water entrainer) is 15 mL;the reaction time is 3.5 h.The yield of propyl cinnamate thus obtained exceeds 90.0%.The catalyst is able to be reused 6 times and the yield is still above 85.0%. References | Related Articles | Metrics

Reviews

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Research progress in the determination of mercury in cosmetics SU Li-xia, ZHAN Jing-ming, GU Xiao-na, WU Bao-li, YANG Kai, ZHOU Wen-ming 2018, 48 (12):  706-710.  doi: 10.13218/j.cnki.csdc.2018.12.008 Abstract ( 327 )   PDF (5744KB) ( 308 )   The research progress of the determination methods of mercury in cosmetics in recent years was reviewed.The advantages and disadvantages of determination methods of mercury in cosmetics were introduced,including atomic fluorescence spectrometry,cold atomic spectroscopy,direct mercury analyzer,atomic absorption spectrometry,ICP-MS and potentiometric stripping analysis.Considering the practical requirements,the characteristics of different methods were compared and the development prospects were discussed. References | Related Articles | Metrics

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Current state and discussion of rapid detection methods of heavy metals in cosmetics LI Xin-ai, LI Zhou-min, YAO Ying, ZHANG Ai-cai-jun, LIU Xiao-ying 2018, 48 (12):  711-716.  doi: 10.13218/j.cnki.csdc.2018.12.009 Abstract ( 293 )   PDF (6470KB) ( 284 )   The sources and hazard of heavy metals in cosmetics were introduced.The authors compared the limits of the heavy metals that must be inspected in cosmetic products from various countries,and reviewed some conventional and rapid detection methods for heavy metals in cosmetics.In addition,some rapid detection methods in other sample other than cosmetics were introduced which could provide a reference for the establishment of rapid and simple detection of cosmetics. References | Related Articles | Metrics

Analytical methods and testing

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Simultaneous determination of 23 preservatives in 8 different matrixes of cosmetics by HPLC-MS/MS CHEN Jing, MAO Bei-ping, ZHENG Rong, WANG Ke 2018, 48 (12):  717-724.  doi: 10.13218/j.cnki.csdc.2018.12.010 Abstract ( 293 )   PDF (6762KB) ( 272 )   A high liquid chromatography tandem mass spectrometric (HPLC-MS/MS) method has been developed for the simultaneous determination of 23 preservatives in 8 different matrixes of cosmetics.Samples were ultrasonically extracted by solvent,centrifuged at 10 000 r/min for 5 min,filtered through a 0.22 μm microporous membrane,and the continued filtrate was taken for analysis.The separation was carried out by an Agilent Poroshell 120 EC-C18 column (100 mm×4.6 mm,2.7 μm) with a gradient elution of 5 mmol/L ammonium acetate in water and 5 mmol/L ammonium acetate in methanol.The flow rate was 0.45 mL/min,the column temperature was 30 ℃,and the injection volume was 2 μL.A triple quadrupole tandem mass spectrometric method was used as the determination method.The results show that the relative standard deviations (RSD) are 0.6%-8.4%,the recoveries are 76.3%-107.1%,the linear range of various preservatives is different ranging from 1-100,10-1 000 and 100-10 000 μg/L.The linear mass concentration has a good linear relationship,and the correlation coefficient is greater than 0.996.The detection limits of 23 preservatives are 0.04-4 μg/g.This method has the advantages of high separation efficiency,short analysis time and many analytical components,and is suitable for analyzing the preservatives in cosmetics products. References | Related Articles | Metrics