凝胶分散法用于TiO_2紫外屏蔽能力的测定
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摘要
利用胶凝作用使颗粒均匀分散于凝胶介质,建立一种测定TiO_2紫外吸收的新方法。研究表明,质量分数为0.15%的卡波姆980凝胶可使锐钛型TiO_2在3 h内稳定分散。TiO_2在UVA和UVB波段无最大吸收,吸光度值随波长增大略有增大。吸光度的均值与其质量浓度在25～70 mg/L范围内线性关系良好,回归方程为A=0.009 7ρ+0.042 5,R~2=0.999,精密度高(RSD=0.20%～1.16%),准确度好(回收率为88.10%～110.3%,RSD=0.58%～1.24%)。该方法用于自制TiO_2防晒乳中TiO_2的质量浓度定量,相对误差<5%。研究结果可为颗粒型物质分光光度法定量测定提供方法借鉴。
A new method for determining UV absorption of TiO_2 was established by using gelation to uniformly disperse particles in a gel medium. The results show that 0.15% Carbomer 980 gel can make anatase TiO_2disperse stably within 3 hours. TiO_2 has no maximum absorption in the UVA and the UVB bands, and the absorbance value slightly increases with increasing wavelength. The mean absorbance has a good linear relationship with its mass concentration within 25-70 mg/L range, and the regression equation is A=0.009 7ρ+0.042 5, with R~2=0.999, and the precision is high(RSDs=0.20%-1.16%)and the accuracy is good(recoveries 88.10%-110.3%, RSD=0.58%-1.24%). The method was applied to quantify the mass concentration of TiO_2 in self-made TiO_2sunscreen lotions, and the relative error is less than 5%. The research results can provide a reference for quantitative determination of granular materials by spectrophotometry.
A new method for determining UV absorption of TiO_2 was established by using gelation to uniformly disperse particles in a gel medium. The results show that 0.15% Carbomer 980 gel can make anatase TiO_2disperse stably within 3 hours. TiO_2 has no maximum absorption in the UVA and the UVB bands, and the absorbance value slightly increases with increasing wavelength. The mean absorbance has a good linear relationship with its mass concentration within 25-70 mg/L range, and the regression equation is A=0.009 7ρ+0.042 5, with R~2=0.999, and the precision is high(RSDs=0.20%-1.16%)and the accuracy is good(recoveries 88.10%-110.3%, RSD=0.58%-1.24%). The method was applied to quantify the mass concentration of TiO_2 in self-made TiO_2sunscreen lotions, and the relative error is less than 5%. The research results can provide a reference for quantitative determination of granular materials by spectrophotometry.
引文
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[15]Khunkitti W,Satthanakul P,Waranuch N,et al.Method for screening sunscreen cream formulations by determination of in vitro SPF and PA values using UV transmission spectroscopy and texture profile analysis[J].Journal of Cosmetic Science,2014,65(3):1-13.
[16]Zhang Jidong.Study on evaluation methods and instruments for ultraviolet shielding properties of nano-oxides[D].Shanghai:East China Normal University,2004.
[17]Sudhahar V,Balasubramanian V.Sun production factor(SPF)determination of marketed sunscreen formulation by in-vitro method using UV-VIS spectrophotometer[J].Archives of Applied Science Research,2013,5(6):119-122.
[18]Chen Jianjun,Wang Zhiyu,Qian Guodong,et al.Preparation of uniformly dispersed nano-TiO2 and its UV shielding properties[J].Materials Protection,2003,36(11):7-9.
[19]Zheng Huanyu,An Maozhong,Zhou Yuhong.Determination of nanoalumina in composite coatings by gum augmentation spectrophotometry[J].Chinese J Anal Chem,2006,34:263-265.
[2]Ramos S,Homem V,Alves A,et al.Advances in analytical methods and occurrence of organic UV-filters in the environment:A review[J].The Science of the Total Environment,2015,526:278-311.
[3]Manaia E B,Correa M A,Chiavacci L A.Inorganic UV filters[J].Brazilian Journal of Pharmaceutical Science,2013,49(2):201-209.
[4]Corinaldesi C,Marcellini F,Nepote E,et al.Impact of inorganic UV filters contained in sunscreen products on tropical stony corals(Acropora spp.)[J].Science of the Total Environment,2018,637-638:1279-1285.
[5]Ruszkiewicz J A,Pinkas A,Ferrer B,et al.Neurotoxic effect of active ingredients in sunscreen products,a contemporary review[J].Toxicology Reports,2017(4):245-259.
[6]Cadet J,Douki T.Oxidatively generated damage to DNA by UVAradiation in cells and human skin[J].The Journal of Investigative Iermatology,2011,131(5):1005-1007.
[7]Moh S H,Suh S S,Cho M J,et al.Evaluation of sun protection factor(SPF)and protection factor of UVA(PFA)of the sunscreen containing microalgal extracts and MAAs[J].Journal of the Korea Academia-Industrial Cooperation Society,2014,15(5):3312-3318.
[8]Sayre R M,Dowdy J C,Lott D L,et al.Commentary on“UVB-SPF”:the SPF labels of sunscreen products convey more than just UVBprotection[J].Photodermatology Photoimmunology&Photomedicine,2008,24(4):218-220.
[9]Cao Xiaohua,Xiao Duo.Determination of UV transmittance of sunscreen and analysis of sunscreen effect[J].Spectroscopy and Spectral Analysis,2013,33(11):3098-3100.
[10]Chen Chaomao,Chen Daiyi,Liu Shaorong,et al.Study on correlation between the SPF and absorbance values of O/W sunscreen cosmetics[J].Flavour Fragrance Cosmetics,2015(3):51-52.
[11]Zhao Xiaomin,Chen Zhihua,Li Yanan,et al.Analysis of compatibility of sunscreen agents and its influencing factors[J].Chin J Aesth Med,2015(20):78-82.
[12]Du Xiaohao,Xu Wei.Sunscreen cosmetics sunscreen effect evaluation method-UV absorbance method[J].China Surfactant Detergent&Cosmetics,1998(3):43-46.
[13]Fan Yuping.Review on efficacy evaluation and future development for sunscreens[J].Flavour Fragrance Cosmetics,2013(4):49-54.
[14]Chen Yan,Qi Yan,Wang Chao,et al.Evaluation and prospect of efficacy of sunscreen cosmetics[J].Detergent&Cosmetics,2006,29(8):31-33.
[15]Khunkitti W,Satthanakul P,Waranuch N,et al.Method for screening sunscreen cream formulations by determination of in vitro SPF and PA values using UV transmission spectroscopy and texture profile analysis[J].Journal of Cosmetic Science,2014,65(3):1-13.
[16]Zhang Jidong.Study on evaluation methods and instruments for ultraviolet shielding properties of nano-oxides[D].Shanghai:East China Normal University,2004.
[17]Sudhahar V,Balasubramanian V.Sun production factor(SPF)determination of marketed sunscreen formulation by in-vitro method using UV-VIS spectrophotometer[J].Archives of Applied Science Research,2013,5(6):119-122.
[18]Chen Jianjun,Wang Zhiyu,Qian Guodong,et al.Preparation of uniformly dispersed nano-TiO2 and its UV shielding properties[J].Materials Protection,2003,36(11):7-9.
[19]Zheng Huanyu,An Maozhong,Zhou Yuhong.Determination of nanoalumina in composite coatings by gum augmentation spectrophotometry[J].Chinese J Anal Chem,2006,34:263-265.