Fluorescent sensor for rapid detection of organophosphate pesticides using recombinant carboxylesterase PvCarE1 and glutathione-stabilized gold nanoclusters
MICROCHEMICAL JOURNAL, cilt.200, ss.1-8, 2024 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 200
- Basım Tarihi: 2024
- Doi Numarası: 10.1016/j.microc.2024.110322
- Dergi Adı: MICROCHEMICAL JOURNAL
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, CAB Abstracts, Chemical Abstracts Core, Chimica, Food Science & Technology Abstracts, Index Islamicus, Veterinary Science Database
- Sayfa Sayıları: ss.1-8
- Anahtar Kelimeler: Enzyme inhibition, Fluorescence probe, Gold nanoclusters, Recombinant enzyme, Inner filter effect
- Atatürk Üniversitesi Adresli: Evet
Özet
Considering the severe threat to human health posed by organophosphate pesticides (OPs), reliable and rapid detection methods are urgently needed. In this study, we developed a straightforward and sensitive fluorescence sensor for OP detection. The sensor is based on glutathione-stabilized gold nanoclusters (GSH-AuNCs) and the inhibition of the recombinant carboxylesterase PvCarE1. The fluorescence signal of GSH-AuNCs is efficiently quenched by p-nitrophenol (p-NP) through inner filter effect, which is the product of the recombinant carboxylesterase PvCarE1-catalyzed hydrolysis of p-nitrophenol acetate (p-NPA). In the presence of OPs, the activity of the recombinant carboxylesterase PvCarE1 is inhibited, resulting in decreased p-NP production, and the fluorescence signal of the GSH-AuNCs is maintained. The assay exhibited good sensitivity to dichlorvos, trichlorfon, and profenofos, with detection limits of 0.2 mu g/L, 5 mu g/L, and 5 mu g/L, respectively. In addition, the developed assay was applied to apple sample detection, with recoveries ranging from 84.5 % to 106.3 % and RSDs ranging from 1.3 % to 10.5 %, demonstrating its high potential in monitoring OPs in food.