The optical responses of DNA-wrapped single-walled carbon nanotubes (DNA-SWNTs) caused by the addition of epigallocatechin gallate (EG) and tannic acid (TA) were investigated. Near infrared absorbance and photoluminescence spectra of pre-oxidized DNA-SWNTs were measured with and without EG and TA. Since both EG and TA have antioxidant abilities, the near infrared spectra changed after the addition of the chemicals. While detection of the antioxidant abilities of EG by DNA-SWNT hybrids has been previously reported, TA was employed for the first time. The changes in the absorbance caused by the addition of TA were found to saturate at 0.33 µM TA, although saturation was not observed even at 3.3 µM with the addition of EG. Oxidation of DNA-SWNT was suppressed by addition of TA or EG. The effects of TA were much greater than those of EG on the absorbance. The photoluminescence did not appear to saturate at 3.3 µM for either EG or TA. photoluminescence had a larger measurement capacity than NIR absorbance. Interestingly, the photoluminescence change caused by EG was much larger than that of TA at 3.3 µM, although the antioxidant property of TA was stronger at 0.33 and 0.033 µM, suggesting that the optical responses were not simple redox reactions. Peak shifts in the absorbance/photoluminescence spectra revealed unique differences according to the chirality of the SWNTs and the types of chemicals used. This suggests that the combination of absorbance/photoluminescence and peak intensity/peak shifts could detect multiple types of chemical information, not only redox reaction. A direct comparison between EG and TA was demonstrated for the first time in this novel study. In addition, sensing of EG and TA by near infrared spectra was made available using not only changes in intensity but also a variety of peak shifts of SWNTs.

研究了表没食子儿茶素没食子酸酯（EG）和鞣酸（TA）的添加引起的DNA包裹的单壁碳纳米管（DNA-SWNTs）的光学响应。在有和没有EG和TA的情况下，测量了预氧化的DNA-SWNT的近红外吸收和光致发光光谱。由于EG和TA均具有抗氧化能力，因此添加化学药品后，近红外光谱发生了变化。虽然以前已经报道过通过DNA-SWNT杂合体检测EG的抗氧化能力，但TA还是首次使用。尽管在添加了EG的情况下，即使在3.3 µM的条件下也未观察到饱和，但由于添加TA引起的吸光度变化在0.33 µM的条件下达到饱和。加入TA或EG可抑制DNA-SWNT的氧化。TA对吸光度的影响远大于EG。EG或TA的光致发光在3.3 µM时似乎都不会饱和。光致发光比NIR吸光度具有更大的测量能力。有趣的是，尽管在0.33和0.033 µM时TA的抗氧化性能更强，但由EG引起的光致发光变化远大于TA在3.3 µM时的抗发光性能，这表明光学响应不是简单的氧化还原反应。吸光度/光致发光光谱的峰位移显示出不同的独特性，这取决于单壁碳纳米管的手性和所用化学品的类型。这表明吸光度/光致发光和峰强度/峰移动的组合可以检测多种类型的化学信息，而不仅是氧化还原反应。这项新颖的研究首次证明了EG和TA之间的直接比较。此外，不仅可以使用强度变化，还可以使用SWNT的多种峰位移，通过近红外光谱来感应EG和TA。