Table 2.

Representative research on colorimetric assays coupled with Au nanoparticles for pathogenic bacteria detection.

Target Microorganism	Detection Limit (CFU/mL)	Detection Time (min)	Aqueous Solution	References
E. coli O157:H7	<7 log	40	Water	Su et al. [32]
E. coli (XL1)	>2 log	5	Phosphate buffer	Miranda et al. [33]
B. subtilis	4.5 × 3 log	D/N 1	MOPS buffer	Qiu et al. [34]
S. enterica	5 log	0.5 2	Food homogenates	Thavanathan et al. [35]
E. coli O157:H7	<10	120	Three food types 3	Cho and Irudayaraj [40]
S. typhimurium	<10	120	Three foods types 3	Cho and Irudayaraj [40]
E. coli	2 log	>180	PBS 4	Lim et al. [41]

¹ D/N denotes the data not provided by the research article. ² Thavanathan et al. [35] did not clarify the food types or the exact procedure to generate the food homogenates used in their experiments. ³ Reduced fat milk, ground beef, and pineapple juice. ⁴ Phosphate-buffered saline.