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Heme protein-mediated synthesis of PEDOT:PSS: enhancing conductivity by inhibiting heme degradation

机译：血红素蛋白介导的PEDOT：PSS合成：通过抑制血红素降解来增强电导率

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摘要

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a conducting polymer used in regenerative medicine, solar energy conversion, OLEDs, and biological sensing. PEDOT:PSS can be synthesized with a wide range of biomolecular oxidants including hemoglobin, catalase, horseradish peroxidase, soybean peroxidase, and laccase. Unfortunately heme proteins have been found to degrade during polymer synthesis, limiting their utility. We show that the peroxidase substrate, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), inhibits heme degradation during hemoglobin-mediated synthesis of PEDOT:PSS, measured by fluorescence emission. Four-point probe measurements show that films of PEDOT:PSS are more conductive when synthesized in the presence of ABTS. Characterization of the resulting PEDOT:PSS films using visible and near IR spectroscopy shows that ABTS produces a bipolaron rich polymer, as expected if heme degradation is inhibited. Conductivity is further enhanced (31 S cm?1) when an iron chelator, EDTA, is used in combination with ABTS.
机译：聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）是用于再生医学，太阳能转换，OLED和生物传感的导电聚合物。 PEDOT：PSS可以与多种生物分子氧化剂合成，包括血红蛋白，过氧化氢酶，辣根过氧化物酶，大豆过氧化物酶和漆酶。不幸的是，已经发现血红素蛋白在聚合物合成过程中降解，限制了其用途。我们显示过氧化物酶底物，2,2'-叠氮基双（3-乙基苯并噻唑啉-6-磺酸）（ABTS），抑制血红素介导的血红蛋白介导的PEDOT：PSS合成中的降解，通过荧光发射测量。四点探针测量表明，在存在ABTS的情况下合成时，PEDOT：PSS膜的导电性更高。使用可见光和近红外光谱对所得PEDOT：PSS薄膜进行表征的结果表明，如抑制血红素降解所预期的那样，ABTS会产生富含双极化子的聚合物。当铁螯合剂EDTA与ABTS结合使用时，电导率会进一步提高（31 S cm ？1 ）。

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