Table of Content

22 December 2020, Volume 50 Issue 12 Previous Issue    Next Issue

Basic research

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Investigation on fluorescence characteristics of nanodots prepared by aqueous polymerization of conjugated linoleic acid CAO Chong-mei,FAN Ye,FANG Yun,XIA Yong-mei 2020, 50 (12):  815-820.  doi: 10.3969/j.issn.1001-1803.2020.12.001 Abstract ( 324 )   HTML ( 79 )   PDF (1447KB) ( 295 )   Bluish-green light-emitting fluorescence nanodots （FNDs） were prepared by aqueous polymerization in virtue of conjugated double bonds of conjugated linoleic acid （CLA）, indicative of an average particle size of 16 nm. The formation of the FNDs was conducted by polymerizing biomass small molecules in water at relatively low temperature, which was energy saving and safe compared with the reports of carbon dots （CDs） from other biomass carbon sources. This method was mainly based on the addition polymerization of the conjugated double bonds, indicative of good controllability for both reaction and particle size. The experimental results showed that, the FNDs had the optimal excitation wavelength of 320 nm; the excitation dependence would shift to partial excitation dependence when the degree of polymerization was increased; self-absorption had appeared as the concentration of carbon source was increased. Therefore, the study had theoretical and practical significance for the preparation of nanomaterials from natural fats and oils. The FNDs showed the potential of application in drugs and daily chemicals due to the green carbon source, the biocompatible product and the eco-friendly aqueous polymerization. Figures and Tables | References | Related Articles | Metrics

Lecture of science and technology

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Study on the design and synthesis of amphiphilic polymers and their synergistic systems （XII） Enhanced oil recovery KANG Wan-li,JIA Ru-xue,YANG Hong-bin,ZHU Tong-yu,LI Zhe,Bauyrzhan Sarsenbekuly 2020, 50 (12):  821-828.  doi: 10.3969/j.issn.1001-1803.2020.12.002 Abstract ( 255 )   HTML ( 7 )   PDF (1258KB) ( 366 )   Amphiphilic polymers, with their excellent thickening and emulsifying properties, have been gradually applied in the field of enhanced oil recovery. The mechanism of enhanced oil recovery by amphiphilic polymers was summarized from the aspects of enhancing sweep efficiency and displacement efficiency. The recovery efficiency of amphiphilic polymers under different injection modes was investigated, including injection slug size and injection timing. Finally, the potential of enhanced oil recovery for the three types of synergistic systems was discussed. The research results could provide guidance for the evaluation and prediction of the recovery efficiency of amphiphilic polymers in the oilfield. Figures and Tables | References | Related Articles | Metrics

Development and application

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Study of the performance of sodium alkyl diphenyl ether disulfonates CAO Sheng-ti,JIAO Ti-liu,HUO Yue-qing,LIU Xiao-chen,NIU Jin-ping 2020, 50 (12):  829-832.  doi: 10.3969/j.issn.1001-1803.2020.12.003 Abstract ( 422 )   HTML ( 14 )   PDF (1657KB) ( 308 )   The acid resistance, alkali resistance, thermal stability and surface tension of sodium dioctyl diphenyl ether disulfonate （C8-DADS） and sodium monohexadecyl diphenyl ether disulfonate （C16-MADS） were studied. The solution stability and interfacial tension of the system of C8-DADS （or C16-MADS） mixed with dodecyltrimethylammonium chloride （DTAC） were investigated. The results were as follows: the H2SO4 resistance, NaOH resistance and thermal stability of C16-MADS were better than that of C8-DADS; the critical micelle concentration （cmc） of C16-MADS was lower than that of C8-DADS, and the surface tension at cmc of C8-DADS was lower than that of C16-MADS; the solution stability of C16-MADS/DTAC was higher than that of C8-DADS/DTAC; the interfacial tension of the system with m（C8-DADS）:m（DTAC） of 8:2 was very low and could reach the order of 10-3mN/m. Figures and Tables | References | Related Articles | Metrics

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Study on the synthesis and demulsification of phenol-amine resin block polyether based on bisphenol A ZENG Hao-jian,CHANG Zhen,JI Wen-xiong,TIE Lei-lei,LI Xiang 2020, 50 (12):  833-841.  doi: 10.3969/j.issn.1001-1803.2020.12.004 Abstract ( 386 )   HTML ( 9 )   PDF (1606KB) ( 807 )   Phenol-amine resin （BPA） was synthesized from bisphenol A and polyethylene polyamine. At the PO/EO mass ratio of 3:1, eight kinds of bi-block polyethers with different BPA/PO mass ratios were synthesized. The results showed that the drainage rate and drainage volume for the bi-block polyether with the BPA/PO mass ratio of 1:99 were higher than others. Then, at the BPA/PO mass ratio of 1:99, bi-block polyethers with different PO/EO mass ratios and multi-block polyethers with different PO/EO orders were synthesized. The properties of these oil demulsifiers were evaluated using bottle-testing method at 50 ℃ with the demulsifier mass concentration of 50 mg/L. The results showed that the demulsifying properties of BPA99 demulsifiers reached a maximum at the PO/EO mass ratio of 1.5:1. With the increase of EO content, the hydrophilicity of the demulsifier increased gradually, and thus these molecules would have an appropriate partition coefficient between the oil and aqueous phases. This would benefit the coalescence of water droplets and the decrease of strength of oil-water interfacial film. Dynamic interfacial tension curves indicated that these demulsifiers exhibited rapid interfacial diffusion. With the increase of EO content, the interfacial activity and the ability of interfacial displacement of the demulsifier increased gradually. For the multi-block polyethers with different PO/EO orders, the demulsifying properties of BPA9915 and BPA9910 with the structure of BPA-PO-EO were higher than others. The demulsifiers with the structure of BPA-EO-PO had harmful demulsifying properties. Compared with the bi-block polyethers （BPA9915 and BPA9910）, the tri-block polyethers and tetra-block polyethers showed a low drainage volume and a slow drainage rate. When the EO content in the terminal block was increased （the total number of EO units was fixed）, the demulsifying properties of the tetra-block polyether became excellent. Compared with TS-P100A and DM-4002 used in the oilfield, BPA9915 showed better demulsifying properties. Figures and Tables | References | Related Articles | Metrics

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A study on the stability of CO2-triggered Pickering emulsion based on tetradecyldiethylenetriamine FENG Xiao-jun,ZHANG Peng,LI Rui-rui,LAI Lu 2020, 50 (12):  842-847.  doi: 10.3969/j.issn.1001-1803.2020.12.005 Abstract ( 317 )   HTML ( 10 )   PDF (2169KB) ( 248 )   The CO2-triggered O/W Pickering emulsion was prepared with SiO2 nanoparticles and tetradecyldiethylenetriamine （C14DETA） as emulsifiers and n-decane as oil phase. At 25 ℃, the emulsion could be smartly switched “on （stable）” and “off （unstable）” by bubbling CO2 and N2 alternately. C14DETA was protonated into C14DETA-CO2 by bubbling CO2, and then adsorbed to the surface of negatively charged SiO2 particles through electrostatic interaction, resulting in in-situ hydrophobic effect and transforming SiO2 particles into surface-active particles and thus stabilizing the emulsion. However, C14DETA-CO2 was deprotonated into C14DETA by bubbling N2, which induced the elimination of in-situ hydrophobic effect, thus leading to complete demulsification of the emulsion. The emulsifying conditions were optimized: the volume ratio of oil/water was 1:1; the mass fraction of SiO2 particles was 0.05% and the concentration of C14DETA-CO2 was 2×10-3 mol/L. The Pickering emulsion needed less surfactant and had stronger stability than the emulsion with C14DETA as the surfactant. Figures and Tables | References | Related Articles | Metrics

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Study on the anti-inflammatory and antibacterial effects of compound radix arnebiae gel topical preparation JIA Ying,WANG Jia-min,WANG Shi-hui,LIU Kai-li,YANG Da-wei,WANG Yan 2020, 50 (12):  848-853.  doi: 10.3969/j.issn.1001-1803.2020.12.006 Abstract ( 692 )   HTML ( 13 )   PDF (1085KB) ( 530 )   The optimal formulation of compound radix arnebiae gel topical preparation （CRAGTP） was screened by ternary phase diagram. Three acute inflammation models （xylene-induced ear swelling, xylene-induced abdominal skin capillary permeability increase, and acetic acid-induced abdominal cavity capillary permeability increase） were used to study the anti-inflammatory effects of CRAGTP. Disc diffusion test （K-B method） was used to study the inhibitory effect of CRAGTP on Staphylococcus aureus （SA）, Escherichia coli （E.coli） and Pseudomonas areuginas （PA） in vitro. Preliminary results show that the optimal composition of CRAGTP formulation is 0.5% of compound radix arnebiae extract, 26.0% of oil phase mixture, 40.2% of surfactants, 3.3% of glycerin and 30.0% of water. The formulated gel is clear and transparent, with pH of 6.49 and particle size of 22.64 nm. CRAGTP shows great ability to inhibit the xylene-induced ear swelling （P<0.01）, xylene-induced increasing of abdominal skin capillary permeability （P<0.01）, and acetic acid-induced increasing of abdominal cavity capillary permeability （P<0.05）. It has an inhibitory effect on SA and E.coli, but has little inhibitory effect on PA. CRAGTP has a good anti-inflammatory effect and a certain antibacterial activity. Figures and Tables | References | Related Articles | Metrics

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Evaluation of cosmetics firming efficacy based on image analysis YANG Ze-ru,WEI Yue-xian,FAN Zhan-hua,LIU Qi,WANG Min,ZHAO Hua 2020, 50 (12):  854-860.  doi: 10.3969/j.issn.1001-1803.2020.12.007 Abstract ( 749 )   HTML ( 21 )   PDF (1124KB) ( 647 )   Based on the evaluation of anti-aging efficacy, on the basis of image analysis method and referring to medical facial evaluation methods, by collecting the subjects’ facial images before and after using the functional cosmetics, and using computer software to analyze the changing rules of subjects’ facial feature point data, a data-based method for the study of facial skin firmness was found. It is proved that the lower half width, nasal-lip angle, eye angle A and eye angle B are statistically significant （P<0.05） , which can be used to evaluate the efficacy of anti-aging skin care products to firm and lift the face. The efficacy of the product can be evaluated by measuring the degree of change in the angle, supplement and improve the existing efficacy evaluation methods of skin care products, and make the evaluation system richer and more stereoscopic. The existing skin care efficacy evaluation methods can be supplemented and improved to make the evaluation system more abundant and stereoscopic. Figures and Tables | References | Related Articles | Metrics

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Evaluation of in vitro inhibition of some commercial antibacterial toothpastes against 7 common oral pathogenic bacteria QIU Xi-bin,SONG Fan,XU Ren-wei,LIN Shi-han,LIN Zhao,HUANG Shu-ling,XU Ya-xuan 2020, 50 (12):  861-866.  doi: 10.3969/j.issn.1001-1803.2020.12.008 Abstract ( 393 )   HTML ( 13 )   PDF (941KB) ( 451 )   In order to investigate the efficacy of commercial toothpastes with bacteriostatic effect or antibacterial effect, the cylinder plate method was introduced to test the bacteriostatic effect on common oral pathogenic bacteria. Lactobacillus acidophilus （LA）, Enterococcus faecalis （EF）, Staphylococcus aureus （SA）, Porphyromonas gingivalis （PG）, S. mutans （SM）,Streptococcus mutans clarke （SMC）, and Pseudomonas aeruginosa （PA） were mainly selected. The results show that 16 kinds of toothpastes tested have different degrees of inhibition zones against 7 common oral pathogenic bacteria. MIC and MBC experiments of the tested toothpastes were carried out simultaneously, and the advantages of the experimental methods and the actual status of the selected commercial antibacterial toothpastes were briefly analyzed. Some suggestions are provided for the specification of the efficacy claims and nominal terms of toothpaste promotion. Figures and Tables | References | Related Articles | Metrics

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Study on the effects of Angelica sinensis on hair growth in vitro and in vivo GAO He-yi,LEI Deng-feng,CHENG Shu-jun,CHEN Zhi-jie,LIU Ren-long 2020, 50 (12):  867-874.  doi: 10.3969/j.issn.1001-1803.2020.12.009 Abstract ( 970 )   HTML ( 17 )   PDF (1507KB) ( 717 )   The effects of the extract of Angelica sinensis on anti-hair loss and hair growth were studied. The efficacy of the extract of Angelica sinensis was evaluated by using different methods such as the model of 5α-reductase inhibition, animal test and human efficacy test. The results showed that this material could inhibit the activity of 5α-reductase in vitro with a dose of 0.5 g/mL. Animal test showed that it could obviously promote hair growth of C57BL/6 mice, and it could induce the hair follicle to enter from telogen into anagen. Human efficacy test showed that the hair loss symptoms could be reduced after using the scalp care essence containing the extract of Angelica sinensis for 7 weeks. In conclusion, the extract of Angelica sinensis could stimulate the hair growth of C57BL/6 mice, and it could help the patients with hair loss symptoms. Figures and Tables | References | Related Articles | Metrics

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Comparison of two methods for evaluating the toothpastes on the efficacy of prevention of extrinsic staining XIE Yu,LI Hui-yi,ZHOU Yue,YE Rong-zi,XIE Jia-ying,TAN Jian-hua 2020, 50 (12):  875-878.  doi: 10.3969/j.issn.1001-1803.2020.12.010 Abstract ( 372 )   HTML ( 9 )   PDF (925KB) ( 565 )   The efficacy of prevention of extrinsic staining were evaluated for 5 commercial toothpastes by two methods, i.e., UV-Vis absorption spectrometry and colorimetric method. Combined with the quantities of sodium phytate, sodium tripolyphosphate and sodium pyrophosphate in each toothpaste, the differences between the results of the two methods were compared. The results showed that, similar rankings among the 5 toothpastes are obtained for the two methods in evaluating the efficacy of prevention of extrinsic staining; in addition, the total quantity of the three active ingredients （i.e., sodium phytate, sodium tripolyphosphate and sodium pyrophosphate） is positively correlated with the efficacy of prevention of extrinsic staining. Furthermore, pearson correlation coefficient and intra-class correlation coefficients （ICC） were used to analyze the preliminary results obtained from the two methods. In conclusion, moderate positive correlation was found between the two results, i.e., R2=0.725; moreover, ICC=0.852 （P<0.05）, indicating that the results of UV-Vis absorption spectrometry and colorimetric method were statistically consistent. Figures and Tables | References | Related Articles | Metrics

Reviews

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Comparative study of the new and old “Regulations on Supervision and Administration of Cosmetics” on the administration of cosmetics registration and notification YUAN Huan,TANG Lin,CHEN Chao,ZHANG Feng-lan,WANG Gang-li 2020, 50 (12):  879-884.  doi: 10.3969/j.issn.1001-1803.2020.12.011 Abstract ( 725 )   HTML ( 47 )   PDF (882KB) ( 467 )   By comparing the provisions in the “Regulations on Supervision and Administration of Cosmetics” with the contents in the original “Regulations on Hygiene Supervision of Cosmetics”, this paper studied and analyzed the thoughts and measures of the “Regulations on Supervision and Administration of Cosmetics” on the adjustment of the registration and notification management of cosmetics and new ingredients. It provides reference for the regulators and cosmetics practitioners. References | Related Articles | Metrics

Analytical methods and testing

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Determination of 43 glucocorticoids in infant eczema products by UHPLC-MS/MS DONG Ya-lei,LIU Zhao,WANG Hai-yan,SUN Lei 2020, 50 (12):  885-891.  doi: 10.3969/j.issn.1001-1803.2020.12.012 Abstract ( 525 )   HTML ( 41 )   PDF (1219KB) ( 546 )   A fast and accurate method for the determination of 43 kinds of glucocorticoids in infant eczema products by UHPLC-MS/MS was established. The samples were extracted with acetonitrile ultrasonically. The supernatant was diluted and injected directly. After optimizing the sample pretreatment and chromatography conditions, as well as mass spectrometry parameters, UHPLC-MS /MS analysis method was performed for qualitative screening in MRM mode. The samples with suspected positive screening results were further confirmed. Qualitative analysis was conducted according to retention time and relative abundance ratio of characteristic ion pairs. Quantitative ion pairs were used for quantitative measurement by external standard method. This method was used for detecting 41 batches of eczema-related cosmetic products and disinfection products sold online. Glucocorticoids were detected in 6 batches of products, and the detection rates of the two types of products were 5.9% and 57.1%, respectively. The method is simple, accurate and reliable, which can be used for the actual sample detection and provide technical support for cosmetic safety supervision. Figures and Tables | References | Related Articles | Metrics

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Test for static electricity on hair surface WANG Zhi-hua, YAO Chen-zhi 2020, 50 (12):  892-895.  doi: 10.3969/j.issn.1001-1803.2020.12.013 Abstract ( 1195 )   HTML ( 35 )   PDF (1127KB) ( 464 )   By simulating the action of combing hair in daily life and measuring the static voltage on the surface of the standard hair tress, the expression index of the static voltage on the surface of the hair was established. The experimental results show that the maximum static voltage generated when the comb leaves the hair can be used to characterize the static voltage of the hair tress. The static voltage on the hair surface is closely related to the environmental humidity, friction strength, and the damage degree of hair fibers. This method can directly quantify the static voltage on the surface of the hair tress, and is easy to operate, fast, and highly reproducible. It can be used for rapid detection of antistatic products. Figures and Tables | References | Related Articles | Metrics

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Rapid fluorescence detection of prohibited cosmetic ingredient metanil yellow LIU Dai-zheng,LIU Ya-feng,XIE Zhen-ming 2020, 50 (12):  896-900.  doi: 10.3969/j.issn.1001-1803.2020.12.014 Abstract ( 377 )   HTML ( 6 )   PDF (1490KB) ( 597 )   A fluorescence method based on hypochlorous acid azo cleavage was established for the rapid determination of metanil yellow which was a prohibited ingredient in cosmetics. Hypochlorous acid was used as a fluorescence transfer initiator to trigger the conversion of the fluorescence emission signal of metanil yellow to achieve the rapid detection. By exploring the factors such as solvent, pH and reaction time, the optimal detection system was obtained. The results showed that metanil yellow showed a strong fluorescence emission at 345 nm with an excitation wavelength of 270 nm in acetonitrile-PBS buffer （V/V=9:1） solution at pH of 7. With the addition of hypochlorous acid, the fluorescence emission was quenched and a strong fluorescence emission appeared at 395 nm. The reaction time at room temperature was less than 40 min. The linear range of detection was 0.2-32 μg/mL, and the correlation coefficient was r2=0.993 9. The limit of detection was 0.2 μg/mL, and the method had good specificity. The average recovery in real samples was 90.5%-112.6% with the RSD less than 4.54%. Figures and Tables | References | Related Articles | Metrics