HP-β-CD对紫外光谱法检测表面活性剂复配体系中NP-40 的抗干扰作用

Anti-interference effect of HP-β-CD on Detection of NP-40 in Surfactant Compound System by UV Spectrometry

吴浩 石东坡 许慧华 姜怡 李赓 朱生华 王齐

WU Hao SHI Dongpo XU Huihua JIANG Yi LI Geng ZHU Shenghua WANG Qi

针对紫外光谱法检测复配表面活性剂含量时存在抗干扰能力差的问题，以羟丙基-β-环糊精（HP-β-CD）为 掩蔽剂，建立了修正的紫外光谱法准确检测烷基酚聚氧乙烯醚（NP-40）与十二烷基硫酸钠（SDS）复配体系中 NP-40 的含量。研究结果表明，SDS不仅能增强NP-40 的吸光度，还能降低NP-40/SDS复配表面活性剂的临界胶 束浓度ccmc。加入SDS后，0.25 mmol/L NP-40 溶液的吸光度由0.345 增加至0.378，增幅9.6%，当SDS浓度分别为 0.20、0.50 mmol/L 时，NP-40/SDS 的ccmc由0.237 mmol/L 分别降至0.227、0.224 mmol/L。HP-β-CD 对紫外光谱法 检测NP-40/SDS 复配体系中的NP-40 具有显著的抗干扰作用，按物质的量比1∶1 加入HP-β-CD 后，0.25 mmol/L NP-40 及其在0.50 mmol/L SDS溶液中的吸光度分别为0.379 和0.381，变化幅度仅为0.8%，加入HP-β-CD后紫外 光谱法能够准确检测复配体系中NP-40 含量，回收率为99.09%～100.00%。NP-40 进入HP-β-CD 分子空腔进而 形成了物质的量比为1∶1型包结物，是HP-β-CD消除复配体系中SDS对NP-40 干扰作用的本因。

In view of the shortcomings of poor anti-interference ability in the detection of compound surfactants by UV spectroscopy，using hydroxypropyl-β-cyclodextrin（HP-β-CD）as the masking agent，a modified UV spectroscopy method was established to accurately detect the content of NP-40 in the compound system of alkylphenol polyoxyethylene ether（NP-40）and sodium dodecyl sulfate（SDS）. The results showed that SDS could not only enhance the absorbance of NP-40，but also reduce the critical micelle concentration ccmc of NP-40/SDS complex system. After adding SDS，the absorbance of 0.25 mmol/L NP-40 increased from 0.345 to 0.378，an increase of 9.6%. When the concentration of SDS were 0.20 mmol/L and 0.50 mmol/L，the ccmc of NP-40/SDS decreased from 0.237 mmol/L to 0.227 mmol/L and 0.224 mmol/L，respectively. The results also showed that HP-β-CD had remarkable anti-interference effect on the detection of NP-40 in NP-40/SDS complex system by UV spectroscopy. After HP-β-CD was added at the molar ratio of 1∶1，the absorbances of 0.25 mmol/L NP-40 and its absorbance in 0.50 mmol/L SDS solution were 0.379 and 0.381，respectively，with a variation of only 0.8%. After adding HP-β-CD，the content of NP-40 in the complex system could be accurately detected by UV spectroscopy，and the recovery rate was 99.09%—100.00%. NP-40 entered the cavity of HP-β-CD molecule and formed a 1∶1 inclusion complex，which was the main reason why HP-β-CD could eliminate the interference of SDS on NP-40 in the complex system.

10.19346/j.cnki.1000-4092.2022.04.026