Self-powered sensors based on biofuel cells have the advantages of simplicity, low cost, no external power supply, etc., and are expected to be widely used in environmental detection, food safety, biomedical and other fields. Recently, researchers of the Biosensing Technology team of the Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, developed a self-powered glucose/oxygen fuel cell sensor that enables highly sensitive detection of L-cysteine â€‹â€‹and is expected to be used clinically. Testing. Related results were published in Analytical Chemistry (C. Hou, et al., Analytical Chemistry 2015, 87, 3382âˆ’3387).
Biofuel cells use enzymes or electrogenic microorganisms as biocatalysts to convert chemical energy in biomass fuels directly into electrical energy through electrochemical means, thereby providing clean energy. Previously, the biosensor technology team has developed a series of high performance biofuel cells based on microbial surface display enzymes (L. Xia, et al., Biosensors & Bioelectronics 2013, 44, 160â€“163; Q. Lang, et al. Biosensors & Bioelectronics 2014, 51, 158â€“163; C. Hou, et al., Analytical Chemistry 2014, 86, 6057â€“6063.). Recently, the team's postdoctoral fellow Hou Chuantao and others prepared bioanode and biocathode with flavin adenine dinucleotide-glucose dehydrogenase (FAD-GDH) and laccase, respectively, to build high-performance glucose/oxygen organisms. The fuel cell has a maximum output power density of 98 Î¼W cm-2 and an open circuit potential of up to 0.78 V. Further study found that Cu2+ can significantly suppress the open circuit potential of the fuel cell, and L-cysteine â€‹â€‹(L-Cys) forms a Cu-S bond through interaction with Cu2+, and can remove Cu2+ on the electrode surface, thereby effectively recovering the fuel cell. Open circuit potential. Using this principle, a self-powered L-cysteine â€‹â€‹sensor was designed and developed (see figure).
The test results show that the linear range of L-cysteine â€‹â€‹detected by this self-powered sensor is 20 nM - 3 Î¼M, and the detection limit is 10 nM, which is much lower than other reported electrochemical methods. The presence of other amino acids and glutathione did not affect the determination of L-cysteine. The sensor is simple, sensitive and specific and is expected to find application in the clinical detection of L-cysteine.
The above research was completed by the researcher Liu Aixuan and received funding from the National Natural Science Foundation of China and the National Postdoctoral Fund.
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