Gold nanoparticles as colorimetric sensor: A case study on E. coli O157:H7 as a model for Gram-negative bacteria

Cysteine capped gold nanoparticles for naked eye detection of E. coli bacteria in UTI patients

“…Since the detection principle is based on the electrostatic interaction recognition, the value of solution pH would be a critical factor in the formation of hydrogen bonds and the determination of surface charge polarity [6]. The effect of pH on the response of the AuNP solution was carried out at a pH range of 3.5, 4.5, 5.5 and 6.5.…”

p-Amino benzenesulfonic acid functionalized gold nanoparticles: Synthesis, colorimetric detection of carbaryl and mechanism study by zeta potential assays

“…Recently, gold nanoparticles (Au NPs)-based colorimetric assays have attracted fast-growing interest in real time and on-site detection for variety of analytes because of their strongly distance-dependent optical properties and exquisite capability of visual detection using "naked" eyes [11][12][13][14][15]. For instance, based on Cu(I) -catalyzed click chemistry, Jiang et al have reported a method for the detection of Cu 2+ ions by azideand terminal alkynefunctionalized Au NPs [16].…”

The frequency of shiga-like toxin (stx1 and stx2) and EHEC-hlyA in food by multiplex PCR

“…In recent epidemiological studies, it is indicated that dairy cattle are primary carriers of E.coli O157:H7 (9)(10)(11).…”

“…Today; multiplex PCR are chosen most frequently for the diagnosis of important virulence genes such as E.coli O157:H7 shiga toxin-1 (Stx1), shiga toxin-2 (Stx2) and hlyA (11,15). Food borne E.coli O157:H7 prevalence ranges from 0.8% to 22.5% in various studies conducted all over the World (14,15).…”