Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China.
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China.
Sensors (Basel). 2017 Apr 10;17(4):811. doi: 10.3390/s17040811.
The single molecular conductance of amino acids was measured by a scanning tunneling microscope (STM) break junction. Conductance measurement of alanine gives out two conductance values at 10 G₀ (1095 nS) and 10 G₀ (15.5 nS), while similar conductance values are also observed for aspartic acid and glutamic acid, which have one more carboxylic acid group compared with alanine. This may show that the backbone of NH₂-C-COOH is the primary means of electron transport in the molecular junction of aspartic acid and glutamic acid. However, NH₂-C-COOH is not the primary means of electron transport in the methionine junction, which may be caused by the strong interaction of the Au-SMe (methyl sulfide) bond for the methionine junction. The current work reveals the important role of the anchoring group in the electron transport in different amino acids junctions.
通过扫描隧道显微镜（STM）断键，测量了氨基酸的单分子电导。对丙氨酸的电导测量得出了两个电导值，分别为 10 G₀（1095 nS）和 10 G₀（15.5 nS），而天冬氨酸和谷氨酸也观察到了类似的电导值，它们比丙氨酸多一个羧酸基团。这可能表明在天冬氨酸和谷氨酸的分子结中，NH₂-C-COOH 主链是电子传输的主要途径。然而，NH₂-C-COOH 并不是蛋氨酸结中电子传输的主要途径，这可能是由于蛋氨酸结中 Au-SMe（甲基硫醚）键的强烈相互作用所致。本工作揭示了在不同氨基酸结中，锚定基团在电子输运中起着重要作用。
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