Sensing the invisible: Ultrasensitive and selective colorimetric detection of E. coli O157:H7 based on masking the peroxidase-mimetic activity of aptamer-modified Au/Fe3O4

Ramadan Ali, Abdullah Alattar, Reem Alshaman, Abduallh J Ghabban, Sultan Alanazi, Hazem Moufeed A Albrahimi, Mohammed Alatwi, Abdullah Jlawi, Abdulmohsen Albalawi, Ahmed D. Alatawi, Budor Al balawi, Afnan S. Almarwani, Mohamed M. El‐Wekil