Novel detection of Escherichia coli beta-D-glucuronidase activity using a microbially-modified glassy carbon electrode and its potential for faecal pollution monitoring

作者：Togo Chamunorwa Aloius; Wutor Victor Collins; Limson Janice Leigh; Pletschke Brett Ivan^*

来源：Biotechnology Letters, 2007, 29(4): 531-537.

DOI：10.1007/s10529-006-9282-5

• biosensor
• drinking water
• electro-oxidation
• faecal
• hydroquinone
• Moraxella

The electrochemical detection of Escherichia coli beta-D-glucuronidase activity as a means of monitoring water pollution by faecal material was investigated using separate Moraxella- and Pseudomonas putida-modified glassy carbon electrodes. The former was more sensitive and selective. The Moraxella-modified biosensor was 100 times more rapid and sensitive than the spectrophotometric detection of beta-D-glucuronidase activity. The experimental limit of detection of the biosensor was two c.f.u. per 100 ml polluted water sample within 20 min. The biosensor gave a linear response to commercial beta-D-glucuronidase concentration between 0.2 ng and 2 mu g ml(-1). The biosensor detected activity of beta-D-glucuronidase from viable but non-culturable (VBNC) cells and can therefore serve as a presence or absence device for rapid water quality monitoring.

• 出版日期2007-4