10.1021/acsomega.6b00477.s001
Seung
Hoon Baek
Seung
Hoon
Baek
Seung Woo Lee
Seung Woo
Lee
Eun Ju Kim
Eun Ju
Kim
Dong-Hyuk Shin
Dong-Hyuk
Shin
Seog-Won Lee
Seog-Won
Lee
Tae Jung Park
Tae Jung
Park
Portable Agrichemical Detection
System for Enhancing
the Safety of Agricultural Products Using Aggregation of Gold Nanoparticles
American Chemical Society
2017
Portable Agrichemical Detection System
OP
detection
AuNP
agrichemical
triazole chemicals
nm
Gold Nanoparticles Organophosphorus
device
2017-03-31 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Portable_Agrichemical_Detection_System_for_Enhancing_the_Safety_of_Agricultural_Products_Using_Aggregation_of_Gold_Nanoparticles/4758562
Organophosphorus (OP) and triazole
chemicals have been commonly
used as insecticides and fungicides to protect agricultural foods
from harmful insects and fungi. However, these agrichemicals sometimes
remain after distribution and can cause serious health and environmental
issues. Therefore, it is essential to detect OPs and triazole chemicals
in agricultural products. Nowadays, many detection techniques for
OPs and triazole chemicals are expensive and time-consuming and require
highly trained technicians. Thus, particularly rapid, simple, and
sensitive detection methods are in demand for on-site screening of
agrichemicals. Gold nanoparticles (AuNPs) have been utilized for applications
in analytical assays and real-time monitoring in the biosensor field
because of their biocompatibility and outstanding size-dependent optical
properties. In this study, we used AuNPs as a detection probe, which
have a size of 17 nm in diameter, a red color, and the absorbance
peak at 520 nm. When imidazole was added to AuNPs mixed with the agrichemicals,
the AuNPs aggregated and their colors changed to purple, causing the
appearance of a new peak at 660–670 nm, which could be measured
within approximately 20 s. Moreover, we developed a novel device for
multiple agrichemical detections using an AuNP-aggregation-based spectrometric
detection system. This portable device is light, simple, fast, and
highly sensitive as well as selective. With this system, agrichemical
residues can be easily detected on the spot at a low cost and in a
short reaction time.