{"id":79446,"date":"2024-03-25T16:20:02","date_gmt":"2024-03-25T15:20:02","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=79446"},"modified":"2024-03-25T16:20:02","modified_gmt":"2024-03-25T15:20:02","slug":"novel-electrochemical-sensor-detects-dangerous-bacteria","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/novel-electrochemical-sensor-detects-dangerous-bacteria\/","title":{"rendered":"Novel electrochemical sensor detects dangerous bacteria"},"content":{"rendered":"<p><strong>Researchers at Goethe University Frankfurt and Kiel University have developed a novel sensor for the detection of bacteria. It is based on a chip with an innovative surface coating. This ensures that only very specific microorganisms adhere to the sensor \u2013 such as certain pathogens. The larger the number of organisms, the stronger the electric signal generated by the chip. In this way, the sensor is able not only to detect dangerous bacteria with a high level of sensitivity but also to determine their concentration.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"650\" height=\"450\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/03\/beitragsbild_Bakteriensensor_Terfort_TOC-Waldo-Style_V4.jpg\" alt=\"\" class=\"wp-image-79455\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/03\/beitragsbild_Bakteriensensor_Terfort_TOC-Waldo-Style_V4.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/03\/beitragsbild_Bakteriensensor_Terfort_TOC-Waldo-Style_V4-300x208.jpg 300w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/03\/beitragsbild_Bakteriensensor_Terfort_TOC-Waldo-Style_V4-500x346.jpg 500w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/03\/beitragsbild_Bakteriensensor_Terfort_TOC-Waldo-Style_V4-18x12.jpg 18w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><figcaption class=\"wp-element-caption\">By using a customized surface to bait the targeted pathogens, they separate by themselves from a mixture of many different bacteria. This makes it easy to detect them electrochemically.\nDiagram: Sebastian Balser, Andreas Terfort Research Group, Goethe University Frankfurt<\/figcaption><\/figure>\n\n\n\n<p>Each year, bacterial infections claim several million lives worldwide. That is why detecting harmful microorganisms is crucial \u2013 not only in the diagnosis of diseases but also, for example, in food production. However, the methods available so far are often time-consuming, require expensive equipment or can only be used by specialists. Moreover, they are often unable to distinguish between active bacteria and their decay products.<\/p>\n\n\n\n<p>By contrast, the newly developed method detects only intact bacteria. It makes use of the fact that microorganisms only ever attack certain body cells, which they recognize from the latter\u2019s specific sugar molecule structure. This matrix, known as the glycocalyx, differs depending on the type of cell. It serves, so to speak, as an identifier for the body cells. This means that to capture a specific bacterium, we need only to know the recognizable structure in the glycocalyx of its preferred host cell and then use this as \u201cbait\u201d.<\/p>\n\n\n\n<p>This is precisely what the researchers have done. \u201cIn our study, we wanted to detect a specific strain of the gut bacterium <em>Escherichia coli<\/em> \u2013 or <em>E. coli<\/em> for short,\u201d explains Professor Andreas Terfort from the Institute of Inorganic and Analytical Chemistry at Goethe University Frankfurt. \u201cWe knew which cells the pathogen usually infects. We used this to coat our chip with an artificial glycocalyx that mimics the surface of these host cells. In this way, only bacteria from the targeted <em>E. coli<\/em> strain adhere to the sensor.\u201d<\/p>\n\n\n\n<p><em>E. coli <\/em>has many short arms, known as pili, which the bacterium uses to recognize its host\u2019s glycocalyx and cling onto it. \u201cThe bacteria use their pili to bind to the sensor in several places, which allows them to hang on particularly well,\u201d says Terfort. In addition, the chemical structure of the artificial glycocalyx is such that microbes without the right arms slide off it \u2013 like an egg off a well-greased frying pan. This ensures that indeed only the pathogenic <em>E. coli<\/em> bacteria are retained.<\/p>\n\n\n\n<p>But how were the scientists able to corroborate that bacteria really were attached to the artificial glycocalyx? \u201cWe bonded the sugar molecules to a conductive polymer,\u201d explains Sebastian Balser, a doctoral researcher under Professor Terfort and the first author of the paper. \u201cBy applying an electrical voltage via these \u2018wires\u2019, we are able to read how many bacteria had bonded to the sensor.\u201d<\/p>\n\n\n\n<p>The study documents how effective this is: The researchers mixed pathogens from the targeted <em>E. coli<\/em> strain among harmless <em>E. coli <\/em>bacteria in various concentrations. \u201cOur sensor was able to detect the harmful microorganisms even in very small quantities,\u201d explains Terfort. \u201cWhat\u2019s more, the higher the concentration of the targeted bacteria, the stronger the emitted signals.\u201d<\/p>\n\n\n\n<p>The paper is initial proof that the method works. In the next step, the involved working groups want to investigate whether it also stands the test in practice. Using it in regions where there are no hospitals with sophisticated lab diagnostics is conceivable, for example.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-background\" style=\"background-color:#eeeeee\"><strong>Publication: <\/strong>Sebastian Balser, Michael R\u00f6hrl, Carina Spormann, Thisbe K. Lindhorst, Andreas Terfort: <strong>Selective Quantification of Bacteria in Mixtures by Using Glycosylated Polypyrrole\/Hydrogel Nanolayers<\/strong>. ACS Applied Materials &amp; Interfaces Article ASAP; <a href=\"https:\/\/doi.org\/10.1021\/acsami.3c14387%22\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1021\/acsami.3c14387<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Researchers at Goethe University Frankfurt and Kiel University have developed a novel sensor for the detection of bacteria. It is based on a chip with an innovative surface coating. This [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":79455,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[244],"post_folder":[],"class_list":["post-79446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-chemistry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Novel electrochemical sensor detects dangerous bacteria | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/novel-electrochemical-sensor-detects-dangerous-bacteria\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Novel electrochemical sensor detects dangerous bacteria | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt\" \/>\n<meta property=\"og:description\" content=\"Researchers at Goethe University Frankfurt and Kiel University have developed a novel sensor for the detection of bacteria. 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