Table of Content

22 August 2025, Volume 55 Issue 8 Previous Issue   

Invited paper

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Effects of extended anionic surfactants on the wettability of polytetrafluoroethylene interface Qi Sun, Zhengrong Zhao, Zhicheng Xu, Lei Zhang, Lu Zhang 2025, 55 (8):  949-960.  doi: 10.3969/j.issn.2097-2806.2025.08.001 Abstract ( 31 )   HTML ( 5 )   PDF (1598KB) ( 21 )   In order to explore the mechanism of improving the surface wettability of low-energy polytetrafluoroethylene （PTFE） by new extended surfactants, five kinds of extended anionic surfactants with different numbers of oxypropylene （PO） and oxyethylene （EO）, octadecyl-（PO） m-（EO）n-sodium carboxylate （C18POmEOnC, m=5, 10, 15, n=5, 10, 15）, were studied. The surface tension and contact angle of C18POmEOnC solution with different concentrations were measured, and the adhesion tension, PTFE-water interfacial tension, and adhesion work were calculated. It was found that the extended surfactant molecules adsorb on the surface of the solution and the PTFE-liquid interface simultaneously when the concentration is lower than the critical micelle concentration （cmc）, and there was a linear relationship between surface tension and adhesion tension. The adsorption amount of C18POmEOnC at the PTFE-water interface was significantly lower than that on the surface of the solution. As the concentration increases above cmc, semi-micelle aggregates on the surface of PTFE are formed by C18POmEOnC molecules through hydrophobic interaction, and the hydrophilic group faces the solution to modify the surface of PTFE with high efficiency. Figures and Tables | References | Related Articles | Metrics

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Study on interfacial dilational rheology of surfactant flooding with low-interfacial-tension surfactants Yanping Chu, Feng Gao, Weihua Zhang, Lei Zhang, Lu Zhang 2025, 55 (8):  961-968.  doi: 10.3969/j.issn.2097-2806.2025.08.002 Abstract ( 31 )   HTML ( 3 )   PDF (1200KB) ( 5 )   The interfacial dilational rheological properties of anionic surfactants heavy alkylbenzene sulfonate （HABS） and petroleum sulfonate （PS） were studied by spinning drop method. The effects of oscillation frequency, surfactant concentration, oil phase and interfacial tension on the interfacial modulus were investigated. The differences of interfacial film strength and interfacial activity between HABS and PS were compared. The results showed that the hydrophilic-lipophilic balance of HABS was better than that of PS, which could reduce the interfacial tension to the magnitude order of 0.01 mN/m against decane and crude oil. Both HABS and PS molecules were dominated by electrostatic repulsion, in which the diffusion-exchange process was dominant, and the viscosity of interfacial film was high. At the decane-water interface, compared with PS, the diffusion-exchange of HABS who had smaller molecular size was faster, the viscosity of interface film was higher, and the dilational modulus decreased more significantly at high concentration. The surface-active components in crude oil adsorbed on the crude oil-water interface, resulting in similar viscoelastic properties of interfacial films of HABS and PS. There was synergistic effect between HABS and crude oil components. As a result, HABS could not only reduce the interfacial tension to the magnitude order of 0.01 mN/m, but also maintain certain interfacial film strength, which showed great potential in improving crude oil recovery. Figures and Tables | References | Related Articles | Metrics

Basic research

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Study on the phase behavior and influencing factors for the emulsions of crude oil/petroleum sulfonate under reservoir conditions Juan Zhang, Ping Liu, Xiaokang Hou, Yuan Gao, Qichao Lv, Zihao Yang 2025, 55 (8):  969-979.  doi: 10.3969/j.issn.2097-2806.2025.08.003 Abstract ( 27 )   HTML ( 2 )   PDF (5245KB) ( 6 )   The phase behavior when crude oil is emulsified by surfactants can directly affect the oil recovery efficiency. Herein, a surfactant used for oil displacement, namely petroleum sulfonate, was selected. The phase behavior for the emulsions of crude oil/petroleum sulfonate under reservoir conditions was studied. The phase diagram of the system was plotted. The effects of surfactant concentration, temperature and salinity on the oil-water interface properties and emulsification behavior were investigated. The results showed that, under reservoir conditions, by changing surfactant concentration and oil-water ratio, two types of emulsions, i.e., W/O/W and W/O, were observed in the mixed system of petroleum sulfonate/simulated oil, indicative of good emulsification performance. The oil-water interface properties and the type, stability and particle size of crude oil emulsions were significantly influenced by surfactant concentration, oil-water ratio, temperature and salinity. The oil-water interfacial tension could be decreased by petroleum sulfonate. The interfacial tension between oil and water increased with increasing temperature, while the interfacial viscoelasticity decreased with the increase of temperature. The interfacial tension first decreased and then increased with the increase of salinity. The stability of emulsions of different types significantly increased with both increase of surfactant concentration and oil-water ratio. With increasing temperature, the crude oil emulsion gradually transformed from W/O emulsion to W/O/W emulsion, while increasing salinity induced the crude oil emulsion to gradually change from W/O/W emulsion to W/O emulsion. In addition, moderate increase of temperature or salinity could increase the stability of crude oil emulsions, but excessively high temperature or salinity would reduce the stability of emulsions. Figures and Tables | References | Related Articles | Metrics

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S-scheme TiO2/C3N5 heterojunction photocatalyst and its performance in degradation of methylene blue Huaisheng Hu, Penghui Zhang 2025, 55 (8):  980-988.  doi: 10.3969/j.issn.2097-2806.2025.08.004 Abstract ( 21 )   HTML ( 1 )   PDF (1883KB) ( 11 )   TiO2/C3N5 heterojunction photocatalyst was prepared by reflux method using isopropyl titanate and nitrogen-rich carbon nitride （C3N5） as raw materials. XRD, FT-IR, TEM, UV-vis DRS and PL were used to characterize the photocatalyst in phase composition, chemical composition, microstructure, light-response absorption, and the separation and recombination of photogenerated carriers. Methylene blue （MB） was used as the target pollutant to evaluate the activity and stability of the TiO2/C3N5 heterojunction photocatalyst. The photocatalytic mechanism was proposed based on the free radical quenching and energy band theory. The results showed that the construction of heterojunction between TiO2 and C3N5 enhanced the visible-light-response absorption ability and effectively promoted the separation of photogenerated carriers. The TiO2/C3N5 heterojunction photocatalyst with the mass ratio of 1:2 showed excellent photocatalytic activity, and the degradation percentage of MB reached 98.60% under visible light irradiation. After 5 cycles, the degradation percentage of MB still reached 98.30%. In the S-scheme photocatalytic mechanism, the holes （h+） and electrons （e-） with high oxidation activity and reduction activity, respectively, were retained, and efficient charge separation was achieved through energy-band bending and the construction of internal electric field. Therefore, a large amount of superoxide radicals （·O2-） were generated in the system to achieve efficient degradation of MB. Figures and Tables | References | Related Articles | Metrics

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Preparation and photocatalytic properties of pitch-derived activated carbon/g-C3N5 composite materials Liyang Hou, Shengyong Li 2025, 55 (8):  989-997.  doi: 10.3969/j.issn.2097-2806.2025.08.005 Abstract ( 22 )   HTML ( 2 )   PDF (2386KB) ( 7 )   Composite materials of pitch-derived activated carbon-supported nitrogen-rich graphitic carbon nitride （PAC/g-C3N5） were prepared by impregnation and high-temperature thermal polymerization. One of these composites was systematically characterized by X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR）, N2 adsorption-desorption, UV-vis diffuse reflectance spectroscopy （UV-vis DRS）, photoluminescence spectroscopy （PL） and electrochemical impedance spectroscopy （EIS）. The photocatalytic degradation of methylene blue （MB） dye by the composite material was studied. The results showed that the specific surface area was 479.1 m2/g after loading g-C3N5 onto the high specific surface area PAC as the support. PAC hindered the layered stacking of g-C3N5, expanded the π-π* electron delocalization, effectively inhibited the photoelectron-hole recombination, promoted the separation of photogenerated carriers, and thus improved the photocatalytic performance. After dark adsorption for 60 min and simulated sunlight irradiation for 120 min, the degradation percentage of MB dye by 3% PAC/g-C3N5 composite reached 97.62%. Good photocatalytic performance was still maintained after 5 cycles. The results of active species capture experiment showed that superoxide radical （·O2-） was the main active species in photocatalytic reaction. The mechanism in photocatalytic degradation of MB by PAC/g-C3N5 was proposed based on energy band structure and energy band potential. Figures and Tables | References | Related Articles | Metrics

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Study on the mechanism and performance of different catalysts in the reaction between dodecanol and 1, 2-epoxybutane Fengqin Li, Tao Geng, Jingjie Zhou, Jinyuan Sun, Ke Zhang, Chunyu Wang 2025, 55 (8):  998-1005.  doi: 10.3969/j.issn.2097-2806.2025.08.006 Abstract ( 25 )   HTML ( 2 )   PDF (2086KB) ( 7 )   The butoxylation of dodecanol with 1, 2-epoxybutane （BO） was catalyzed by KOH, NaOH, MCT-09, CH3ONa and CH3OK. The reaction rates in presence of these five alkaline catalysts were compared and the reaction mechanisms and causes were described. The alkalis reacted with dodecanol to produce alkoxide anions which carried out the chain initiation reaction, and the monomers were activated to regulate the chain growth. The ring opening of BO took place at the epoxide carbon of less steric hindrance, and thus the anionic ring-opening polymerization proceeded. Analysis of reaction rate showed that, among these alkalis, NaOH with a larger molar concentration catalyzed the system the fastest, however, exhibiting the broadest distribution of products. The catalytic rates of CH3ONa and CH3OK were slower because the catalysts were dissolved in methanol. MCT-09 had the slowest catalytic rate due to its weak alkalinity, but its product distribution was the narrowest. The structure of polyoxybutylene lauryl ethers synthesized with different catalysts was determined by FT-IR, GC-MS, 1H-NMR and 13C-NMR, and their self-assembly behavior, physicochemical and application properties were also investigated. The results showed that the self-assemblies around 200 nm could be observed under both TEM and SEM, in which the formation of aggregates was ascribed to the hydrophobic interaction and hydrogen bonding between the BO chain and water. The physicochemical and application properties of those five products were tested, and it was found that the products with a broader distribution had better performance, while the products with relatively narrower distribution had worse performance. Therefore, the BO distribution was the main factor influencing the properties of products synthesized with different catalysts. Figures and Tables | References | Related Articles | Metrics

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Assembly behavior and emulsification property of dopamine modified sodium hyaluronate based on ionic coordination Wanping Zhang, Dexu Meng, Kaikai Liu, Pingli Wang, Qianjie Zhang, Chengliang Li 2025, 55 (8):  1006-1016.  doi: 10.3969/j.issn.2097-2806.2025.08.007 Abstract ( 31 )   HTML ( 5 )   PDF (2809KB) ( 12 )   Amphiphilic polymers prepared from natural biological polysaccharides can expand macromolecular self-assembly to practical applications. In this study, the assembly behavior and emulsification property of dopamine modified sodium hyaluronate were studied by changing the strength and type of ions in the system. The results indicate that the dopamine modified sodium hyaluronate self-assembles to form nanoparticles in aqueous solution and adsorbs at the oil-water interface, which can be used to stabilize the emulsion. Dopamine modified sodium hyaluronate exhibits different assembly behaviors and emulsification properties due to the electrostatic and chelating effects of sodium and manganese ions, respectively. As the concentration of sodium ions increases in the system, the size of polymer particles decreases, the emulsification property decreases, and the size of the emulsion droplets increases. In contract, the size of polymer particles decreases with the increasing of the concentration of manganese ions, which results that the emulsification performance increases and the droplets size decreases. Figures and Tables | References | Related Articles | Metrics

Development and application

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Construction of leaf-like TiO2/attapulgite/lignin composite for UV protection application Liang Zhang, Leyan Wei, Xiazhang Li 2025, 55 (8):  1017-1023.  doi: 10.3969/j.issn.2097-2806.2025.08.008 Abstract ( 27 )   HTML ( 2 )   PDF (2631KB) ( 9 )   The global ultraviolet radiation increases with the destruction of the ozone layer, causing potential harm to human health. Inorganic sunscreen usually have nanotoxicity, oxidation of active free radicals and negative effects on the ecosystem. Due to a large number of functional groups such as benzene ring, keto and phenol hydroxyl, natural lignin has the advantages of removing active free radicals and absorbing ultraviolet light, therefore the development of lignin-based anti-UV materials is of great importance. Inspired by the light protection mechanism of plant leaf structure, titanium dioxide/attapulgite （TiO2/ATP） binary composite was prepared by precipitation method, and then TiO2/ATP/dealkali-lignin （TiO2/ATP/DL） nanocomposite was obtained by microwave hydrothermal method, and the composite was utilized for anti-UV application. Results show that needle-like TiO2 is uniformly distributed on the ATP surface, thereby enhancing TiO2 dispersion, and the abundant phenolic hydroxy in DL molecules and the aromatic rings formed p-π coupling enable them to absorb large amounts of UV light while generating interactions with TiO2/ATP to further improve the UV absorption range. TiO2/ATP/DL is added to the sunscreen lotion. The one-dimensional structure of ATP makes the emulsion structure more stable, and the formed sunscreen recovers quickly after damage, showing excellent sunscreen application. Figures and Tables | References | Related Articles | Metrics

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Evaluation of the repairing ability of different active ingredients on the lip Donghan Jia, Yanyan Wu, Heji Gong, Zhewei Liu, Changmei Peng, Wanping Zhang 2025, 55 (8):  1024-1034.  doi: 10.3969/j.issn.2097-2806.2025.08.009 Abstract ( 33 )   HTML ( 3 )   PDF (2737KB) ( 20 )   This study used non-invasive evaluation methods measured six skin physiological parameters of the lower lip in 180 subjects, including moisture content, transepidermal water loss （TEWL）, smoothness （SESM）, scaliness of the skin （SESC）, wrinkles （SEW）, and red area of the lip skin, and compared the effects of 6 groups of lip balms （no-additive group, marine oligosaccharides group, ceramides group, glycyrrhizinic acid group, allantoin group, and mixed group; 30 each） on the skin physiological parameters of dry, flaking, and cracked lip subjects. The results showed that the lip mositure content of the subjects in the marine oligosaccharide group, glycyrrhetinic acid group, and allantoin group increased significantly by 44.40%, 42.84% and 58.08% after 7 days of lip balm (P<0.05). The TEWL in the ceramide group and the allantoin group was significantly reduced by 21.83% and 24.72%, respectively, after 7 days of lip paste use (P<0.05). The lip skin smoothness values of subjects in the glycyrrhizic acid group and the allantoin group were significantly reduced by 18.76% and 14.97%, respectively, after 28 days of lip balm application （P<0.05）. The lip skin scaling indices of subjects in the marine oligosaccharide group, the ceramides group, and the allantoin group were significantly reduced by 33.77%, 42.69%, and 38.07%, respectively, after 28 days of lip balm application （P<0.05）. The wrinkle parameters of the lip skin of the subjects in the marine oligosaccharide, glycyrrhizinic acid and allantoin groups were significantly reduced by 23.06%, 23.29% and 25.98%, respectively, after 28 days of lip balm application （P<0.05）. And the area of the red zone of the lip skin of the subjects in the allantoin group was significantly reduced by 4.27%, after 28 days of lip balm application （P<0.05）. Combining the effects of the four active ingredients on the secretion of hyaluronic acid （moisturizing effect） and inflammatory factor （IL-6） in HSF cells, it suggests that marine oligosaccharides and allantoin have a perfect impact on enhancing the water content of the skin on the lips of the subjects, and further improve the symptoms of flaking and wrinkles on the lips of the subjects. The ceramide and allantoin can repair the skin barrier well and have a good effect on the chapped and flaky lips of the subjects. After 28 days of using lip balm, the water content of lips in the mixed group increased, the skin barrier was repaired and became smoother, and the wrinkles, scale index, and red zone value were reduced, which could well relieve chronic lip inflammation and lay a foundation for developing lip products for the treatment of chronic cheilitis. Figures and Tables | References | Related Articles | Metrics

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Study on the foam properties of mixed systems based on sodium lauroyl glutamate Zhecheng Wang, Zhihui Zheng, Minjia Yuan 2025, 55 (8):  1035-1041.  doi: 10.3969/j.issn.2097-2806.2025.08.010 Abstract ( 46 )   HTML ( 5 )   PDF (4352KB) ( 20 )   The foam properties of sodium lauroyl glutamate （SLG） and its compounded systems were investigated. The foaming ability and foam stability were measured by using a dynamic foam analyzer. The results showed that potassium cocoyl glycinate （PCG） could significantly enhance the foam properties of SLG due to its synergistic effect with SLG. At the optimum PCG/SLG mass ratio of 2:8, the initial bubble count per square millimeter （BCinitial） was 56.3 mm-2, which was approximately 1.2 times that of single SLG, and the half-life of bubble count （tBC 1/2） was 434.1 s, which was approximately 3.4 times of single SLG. Furthermore, this compounded system also exhibited excellent surface activity. The critical micelle concentration （cmc） of this surfactant mixture was 0.022 7% and the maximum surface excess （Γmax） was relatively high. This work could provide important insights into the application of SLG in detergent products. Figures and Tables | References | Related Articles | Metrics

Reviews

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Analysis on the technical guidelines for the application of threshold of toxicological concern (TTC) method Yifei Zhou, Feiya Luo, Lei Sun, Huiying Yang, Xinrong Pei, Xianfu Wu, Yong Lu 2025, 55 (8):  1042-1048.  doi: 10.3969/j.issn.2097-2806.2025.08.011 Abstract ( 29 )   HTML ( 3 )   PDF (1062KB) ( 7 )   The threshold of toxicological concern （TTC） is a risk assessment methodology used to determine the safe exposure threshold for chemical substances. When the exposed quantity of a chemical substance is below this threshold, the risk is considered negligible or acceptable. The National Institutes for Food and Drug Control released the technical guidelines for the application of TTC method in May 2024, which for the first time explicitly standardizes the process of using the TTC method for cosmetic safety assessment, and details the specific steps and usage requirements. This paper interprets the background and significance of the release of the guide, the principles of its application in cosmetic safety assessment, the precautions when using the TTC method, and the restrictions when using the TTC method for safety assessment of plant extract raw materials. It aims to enhance the guiding role of the guideline and to provide a reference for more practitioners to understand, master, and apply the guideline. References | Related Articles | Metrics

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Advancements in the integration and utilization of plant cell engineering technology in cosmetic ingredient development Zhaohui Yang, Xiang Qiu, Yuqi Li, Huanhuan Zhao, Erming Wu, Zhiwei Cheng 2025, 55 (8):  1049-1057.  doi: 10.3969/j.issn.2097-2806.2025.08.012 Abstract ( 30 )   HTML ( 1 )   PDF (1053KB) ( 41 )   Chinese herbal plants contain rich active compounds in skin care, which have been widely used in cosmetics in recent years and are favored by consumers. However, the excessive mining of wild Chinese medicinal plants has led to a sharp reduction in resources, which cannot meet the demand for industrial products. Although artificial planting of Chinese herbal plants can alleviate the contradiction between resources and supply and demand, there are pollution such as agricultural residues and heavy metals in the process of artificial planting of Chinese herbal plants, and the content of active compounds in Chinese herbal plants is also affected by climate and planting management level. This paper reviews another technology to solve the contradiction between supply and demand of Chinese medicinal plant resources, plant cell engineering technology, which can realize the large-scale industrial production of Chinese medicinal plant cells, tissues and organs in a stable artificial environment, and this technology is a beneficial supplement to artificial cultivation. In addition, the application status of raw materials produced by plant cell engineering technology in cosmetics at home and abroad is summarized, and the problems existing in the large-scale production and application of raw materials in cosmetics are discussed and prospected. Figures and Tables | References | Related Articles | Metrics

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Extraction, properties and application of cold-water fish collagen in cosmetic skin care products Kuan Ou, Junjie Zhang, Xiaofeng Qiu, Rui Duan 2025, 55 (8):  1058-1065.  doi: 10.3969/j.issn.2097-2806.2025.08.013 Abstract ( 27 )   HTML ( 1 )   PDF (1502KB) ( 14 )   Collagen is a fibrous protein and an important part of the organism. Due to its good biological properties in beauty, it has become one of the most promising functional raw materials in skin care products. Cold-water fish collagen has excellent moisturising properties, anti-aging activity, biocompatibility and safety, leading to its increasingly widespread application in beauty and skin care products. The article provides a detailed overview of the methods used to extract collagen from cold-water fish and summarizes the differences between collagen from cold-water fish and warm-water fish in terms of collagen structure, amino acid composition, thermal stability and other physicochemical properties. Cold-water fish collagen has a lower content of proline and hydroxyproline, but the serine content is significantly higher than that of the warm-water fish. Among the aquatic collagen, the thermal stability of cold-water fish collagen is poor. In addition, the article describes the factors that cause skin aging and the effects of skin aging, summarizes the mechanisms by which collagen and its derivatives delay and improve skin aging, and introduces the forms of application and product types of cold-water fish collagen in beauty and skin care products. By summarizing and analyzing the extraction methods, properties and applications of cold-water fish collagen, we aim to provide a theoretical basis for the study of collagen from cold-water fish sources and the development of raw materials for beauty and skin care products. Figures and Tables | References | Related Articles | Metrics

Analytical methods and testing

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Detection of pyoluteorin and pyocyanin in cosmetics using UPLC-MS/MS method Lu Wang, Dan Ran, Hui Wang, Shaotong He, Lulu Pi, Nan Deng 2025, 55 (8):  1066-1071.  doi: 10.3969/j.issn.2097-2806.2025.08.014 Abstract ( 28 )   HTML ( 4 )   PDF (1235KB) ( 18 )   A UPLC-MS/MS method for the determination of pyocyanin and pyoluteorin in cosmetics was established. The samples were dispersed by saturated sodium chloride solution in vortex, then acetonitrile was added for ultrasonic extraction, and the upper organic phase was taken for purification analysis. Phenomenex Kinetex （2.6 µm, 50 mm×3.0 mm） column was used for separation. Gradient elution was performed with formic acid water-methanol as mobile phase. External standard method was used for quantification. The results showed that the two compounds could be effectively separated within 5 min, and showed a good linear relationship in the mass concentration range of 1-100 µg/L, with correlation coefficients greater than 0.993. The limits of detection were 0.05 mg/kg, and the limits of quantitation were 0.10 mg/kg. At 0.10, 0.25 and 0.50 mg/kg，the average recoveries of water agent and cream samples ranged from 85.58% to 102.96% and the relative standard deviations （RSD） were 1.54% to 3.77%. The intra-day RSD ranged from 0.51% to 3.68%，and the inter-day RSD ranged from 1.95% to 4.24%. The method has good precision and high accuracy, which is suitable for the determination of pyoluteorin and pyocyanin in various cosmetics. Figures and Tables | References | Related Articles | Metrics

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Simultaneous determination of 5 prohibited phenols in cosmetics by high performance liquid chromatography Deng Hong, Jiang Zhou, Yuan Yan, Fanzhen Shang, Ting Liu, Liangli Wang, Wen Xie 2025, 55 (8):  1072-1077.  doi: 10.3969/j.issn.2097-2806.2025.08.015 Abstract ( 31 )   HTML ( 2 )   PDF (1257KB) ( 12 )   A high performance liquid chromatography （HPLC）-diode array detector （DAD） method was established for the simultaneous determination of 5 kinds of prohibited phenols in cosmetics, including 2, 4, 6-trinitrophenol, 2, 4, 6-trichlorophenol, sesamol, dinoseb, and phloroglucinol. The sample was extracted with methanol in ultrasonic assisted extraction coupled with high speed centrifugation. The separation was performed on Eclipse XDB-C18 column （250 mm×4.6 mm, 5 μm） using gradient elution with acetonitrile/0.1% （V/V） phosphoric acid solution as the mobile phase, and the content was quantified by external standard method. The results show that 2, 4, 6-trinitrophenol has a good linear relationship in the range of 0.125-5.0 μg/mL with the correlation coefficient higher than 0.999 9, and the other 4 prohibited phenols have good linear relationships in the range of 0.25-10.0 μg/mL with the correlation coefficients all higher than 0.999 8. The limits of detection （LOD） and quantitation （LOQ） of the five phenols are 4-8 mg/kg and 10-20 mg/kg, respectively. The recoveries of 5 kinds of prohibited phenols are ranged from 91.3% to 104%, with the relative standard deviations （RSDs） of 0.4% to 5.1% in water-based, emulsion, cream and powder cosmetics under the three levels of low, medium and high, respectively. The simple-pretreatment, rapid, accurate, high sensitivity method can be used for providing technical support for the accurate quantification of prohibited phenols in cosmetics. Figures and Tables | References | Related Articles | Metrics

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Comparison of high performance liquid chromatography and ion chromatography for the determination of acetic acid and trifluoroacetic acid in cosmetic raw material acetyl hexapeptide-8 Cen Chen, Xiaomin Dai, Linqi Yan, Qiaoyuan Cheng 2025, 55 (8):  1078-1084.  doi: 10.3969/j.issn.2097-2806.2025.08.016 Abstract ( 25 )   HTML ( 2 )   PDF (1200KB) ( 10 )   The study aims to investigate the consistency of analysis results of acetic acid and trifluoroacetic acid in cosmetic raw material acetyl hexapeptide-8 by high performance liquid chromatography （HPLC） and ion chromatography （IC）. The methods of determination of acetic acid and trifluoroacetic acid by HPLC and IC were improved and optimized. The specificity, linear range, detection limit, quantitation limit, recovery, precision, repeatability and stability were compared. The results of 15 batches acid and trifluoroacetic acid in acetyl hexapeptide-8 raw materials were analyzed statistically. The results show that both two methods have good specificity, and the linear range of IC method is wider than that of HPLC method, with lower detection and quantification limits. However, the precision of HPLC method is better. Both two methods can be used for qualitative and quantitative analysis of acetic acid and trifluoroacetic acid in acetyl hexapeptide-8. There is no statistical difference between the testing results of HPLC and IC to determine acetic acid in acetyl hexapeptide-8 （|t|=0.200, P>0.05）. Because two methods have their own advantages, the appropriate analysis method can be selected according to the actual situation. Figures and Tables | References | Related Articles | Metrics