title: Detection of pathogen based on the catalytic growth of gold nanocrystals.
abstract: A homogenous detection of pathogen (Giardia lamblia cysts) based on the catalytic growth of gold nanoparticles (AuNPs) has been studied. In this study, centrifugal filters were employed as tools to concentrate and separate the pathogen cells, and moreover amplify the detection signal. The catalytic growth of gold nanoparticles was verified to be positively related to gold seeds concentration. On this basis, homogenous detection of the pathogenic bacteria in liquid phase was established by means of conjugating antibody to gold seeds. Under the given experimental condition, detection limit of G. lamblia cysts was determined as low as 1.088 x 10(3) cells ml(-1). The additional nonspecific binding tests were also conducted to verify the detection specificity. This sensing platform has been proved to be a sensitive, reliable and simple method for large-scale pathogen detection, and provide valuable insight for the development of gold nanocrystals based colorimetric biosensors.
authors.affiliation: Nano-optics and Biomolecular Engineering National Laboratory, Department of Chemical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon 440-746, Republic of Korea.
authors.forename: Xin Xing
authors.initials: XX
authors.lastname: Li
authors.forename: Cuong
authors.initials: C
authors.lastname: Cao
authors.forename: Se Jong
authors.initials: SJ
authors.lastname: Han
authors.forename: Sang Jun
authors.initials: SJ
authors.lastname: Sim
mesh_terms: D000818:Animals; D002138:Calibration; D002384:Catalysis; D016829:Giardia lamblia / Q000254:growth & development* / Q000276:immunology / Q000302:isolation & purification*; D006046:Gold / Q000378:metabolism*; D053758:Nanoparticles / Q000648:ultrastructure; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet
chemical_list: D012996:Solutions; D006046:Gold