Abstract A sensor for the colorimetric estimation of the alcoholic content has been developed based on the entrapment of the reagent (4-N,N-dioctylamino)-4‘-trifluoroacetylazobenzene (ETHT 4001) into polydimethylsiloxane (PDMS) modified with tretraethylorthosilicate (TEOS). When exposed to an alcoholic media, the sensor delivers ETHT 4001 so that it reacts with alcohols, resulting in a change in the solution color. The diffusion of the entrapped ETHT 4001 from the polymeric sensor to the working solution depends on the hydrophobicity of both the sensor matrix and the media, while the time of exposure determines whether the reagent reacts with methanol, or with methanol and ethanol. Thus, the sensors are a versatile tool for the estimation of the methanol content in ethanol or in ethanol/water mixtures, and for the measurement of the total alcoholic content (methanol plus ethanol) in an hydroalcoholic media. The proposed sensors are very easy to prepare, and show good precision and long-term stability. Moreover, the reagent delivery is reversible which allows its recovery once the absorbance measurements have been made simply by adding water, so the sensors can be reutilized and the generation of wastes is reduced. The potential utility of the proposed sensors has been demonstrated by measuring the alcoholic strength of commercial spirit drinks, and the methanol content in spiked hydroalcoholic samples.

中文翻译：

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使用可逆固体传感器比色测定烈酒中的酒精

摘要 基于试剂 (4-N,N-二辛基氨基)-4'-三氟乙酰偶氮苯 (ETHT 4001) 进入用原硅酸三乙酯 (TEOS) 改性的聚二甲基硅氧烷 (PDMS) 中，开发了一种用于比色估计酒精含量的传感器。 . 当暴露在酒精介质中时，传感器会释放出 ETHT 4001，使其与酒精发生反应，从而导致溶液颜色发生变化。截留的 ETHT 4001 从聚合物传感器扩散到工作溶液取决于传感器基质和介质的疏水性，而暴露时间决定了试剂是与甲醇反应，还是与甲醇和乙醇反应。因此，传感器是估计乙醇或乙醇/水混合物中甲醇含量的通用工具，以及测量水醇介质中的总酒精含量（甲醇加乙醇）。所提出的传感器非常容易制备，并显示出良好的精度和长期稳定性。此外，试剂输送是可逆的，一旦通过加水进行吸光度测量后，它就可以恢复，因此可以重新利用传感器并减少废物的产生。通过测量商业烈酒的酒精浓度和加标水酒精样品中的甲醇含量，证明了所提出的传感器的潜在效用。试剂输送是可逆的，一旦吸光度测量完成后，只需加水即可恢复，因此可以重新利用传感器并减少废物的产生。通过测量商业烈酒的酒精浓度和加标水酒精样品中的甲醇含量，证明了所提出的传感器的潜在效用。试剂输送是可逆的，一旦吸光度测量完成后，只需加水即可恢复，因此可以重新利用传感器并减少废物的产生。通过测量商业烈酒的酒精浓度和加标水酒精样品中的甲醇含量，证明了所提出的传感器的潜在效用。