A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters
In this report, a fluorescent sensing method for paraquat based on gold nanoclusters (AuNCs) is proposed. It was found that paraquat could quench both glutathione-capped AuNCs (GSH-AuNCs) and β-cyclodextrin-modified GSH-AuNCs (GSH/β-CDs-AuNCs). The modification of β-CDs on the surface of GSH-AuNCs o...
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MDPI AG
2021-05-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/10/6/1178 |
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| author | Hong-Xin Ren Min-Xin Mao Min Li Cun-Zheng Zhang Chi-Fang Peng Jiang-Guo Xu Xin-Lin Wei |
| author_facet | Hong-Xin Ren Min-Xin Mao Min Li Cun-Zheng Zhang Chi-Fang Peng Jiang-Guo Xu Xin-Lin Wei |
| author_sort | Hong-Xin Ren |
| collection | DOAJ |
| description | In this report, a fluorescent sensing method for paraquat based on gold nanoclusters (AuNCs) is proposed. It was found that paraquat could quench both glutathione-capped AuNCs (GSH-AuNCs) and β-cyclodextrin-modified GSH-AuNCs (GSH/β-CDs-AuNCs). The modification of β-CDs on the surface of GSH-AuNCs obviously enhanced the fluorescence intensity of GSH-AuNCs and improved the sensitivity of paraquat sensing more than 4-fold. This sensibilization was ascribed to the obvious fluorescence intensity enhancement of GSH-AuNCs by β-CDs and the “host–guest” interaction between paraquat and β-CDs. The fluorescence quenching was mainly due to the photoinduced energy transfer (PET) between GSH/β-CDs-AuNCs and paraquat. With the optimized β-CDs modification of the GSH-AuNC surfaces and under buffer conditions, the fluorescent detection for paraquat demonstrated a linear response in the range of 5.0–350 ng/mL with a detection limit of 1.2 ng/mL. The fluorescent method also showed high selectivity toward common pesticides. The interference from metal ions could be easily masked by ethylene diamine tetraacetic acid (EDTA). This method was applied to the measurement of paraquat-spiked water samples and good recoveries (93.6–103.8%) were obtained. The above results indicate that host molecule modification of fluorescent metal NC surfaces has high potential in the development of robust fluorescent sensors. |
| first_indexed | 2024-03-10T11:06:12Z |
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| id | doaj.art-365c83cc13c44ac0a3917d477e4dbdc7 |
| institution | Directory Open Access Journal |
| issn | 2304-8158 |
| language | English |
| last_indexed | 2024-03-10T11:06:12Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Foods |
| spelling | doaj.art-365c83cc13c44ac0a3917d477e4dbdc72023-11-21T21:07:10ZengMDPI AGFoods2304-81582021-05-01106117810.3390/foods10061178A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold NanoclustersHong-Xin Ren0Min-Xin Mao1Min Li2Cun-Zheng Zhang3Chi-Fang Peng4Jiang-Guo Xu5Xin-Lin Wei6State Key Lab of Food Science and Technology, Jiangnan University, Wuxi 214122, ChinaState Key Lab of Food Science and Technology, Jiangnan University, Wuxi 214122, ChinaSchool of Food Science and Technology, Jiangnan University, Wuxi 214122, ChinaJiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, ChinaState Key Lab of Food Science and Technology, Jiangnan University, Wuxi 214122, ChinaSchool of Food Science and Biological Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, ChinaIn this report, a fluorescent sensing method for paraquat based on gold nanoclusters (AuNCs) is proposed. It was found that paraquat could quench both glutathione-capped AuNCs (GSH-AuNCs) and β-cyclodextrin-modified GSH-AuNCs (GSH/β-CDs-AuNCs). The modification of β-CDs on the surface of GSH-AuNCs obviously enhanced the fluorescence intensity of GSH-AuNCs and improved the sensitivity of paraquat sensing more than 4-fold. This sensibilization was ascribed to the obvious fluorescence intensity enhancement of GSH-AuNCs by β-CDs and the “host–guest” interaction between paraquat and β-CDs. The fluorescence quenching was mainly due to the photoinduced energy transfer (PET) between GSH/β-CDs-AuNCs and paraquat. With the optimized β-CDs modification of the GSH-AuNC surfaces and under buffer conditions, the fluorescent detection for paraquat demonstrated a linear response in the range of 5.0–350 ng/mL with a detection limit of 1.2 ng/mL. The fluorescent method also showed high selectivity toward common pesticides. The interference from metal ions could be easily masked by ethylene diamine tetraacetic acid (EDTA). This method was applied to the measurement of paraquat-spiked water samples and good recoveries (93.6–103.8%) were obtained. The above results indicate that host molecule modification of fluorescent metal NC surfaces has high potential in the development of robust fluorescent sensors.https://www.mdpi.com/2304-8158/10/6/1178gold nanoclustersβ-cyclodextrinfluorescence enhancementparaquatphotoinduced energy transfer |
| spellingShingle | Hong-Xin Ren Min-Xin Mao Min Li Cun-Zheng Zhang Chi-Fang Peng Jiang-Guo Xu Xin-Lin Wei A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters Foods gold nanoclusters β-cyclodextrin fluorescence enhancement paraquat photoinduced energy transfer |
| title | A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters |
| title_full | A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters |
| title_fullStr | A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters |
| title_full_unstemmed | A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters |
| title_short | A Fluorescent Detection for Paraquat Based on β-CDs-Enhanced Fluorescent Gold Nanoclusters |
| title_sort | fluorescent detection for paraquat based on β cds enhanced fluorescent gold nanoclusters |
| topic | gold nanoclusters β-cyclodextrin fluorescence enhancement paraquat photoinduced energy transfer |
| url | https://www.mdpi.com/2304-8158/10/6/1178 |
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