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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE · 2022 ·Vol. 102 ·期 15 ·7405-7413 · IF 4.125

Real-time and in situ monitoring of organosilicon-induced thiram penetration into cabbage leaves by surface-enhanced Raman scattering mapping

Ting-tiao Pan,Meiting Guo,Ping Lu,Deyu Hu

BACKGROUND Understanding pesticide penetration behavior is important for effective application of pesticides. However, there is a lack of an effective method to monitor pesticide penetration behavior and its changing process. In the present study, a novel surface-enhanced Raman scattering (SERS) mapping method was used for real-time and in situ tracking of the penetration behaviors of thiram and thiram–organosilicon mixture on cabbage leaves. RESULTS The results suggest that thiram has very weak ability to penetrate into cabbage leaves. However, when the thiram–organosilicon mixture was placed on leaf surfaces, a clear thiram signal was detected inside the leaf after 2 h of exposure, a strong signal was observed after 12 h, and the penetration depth of thiram was approximately 200 μm after 48 h. CONCLUSION SERS mapping was demonstrated to be a reliable method for in situ monitoring of organosilicon-induced thiram penetration into cabbage leaf over time. The present study provides a new reference for rationally selecting adjuvants, effectively applying pesticides, and reducing pesticides residue in food. © 2022 Society of Chemical Industry.

CAS / MDL: 16961-25-4 144-55-8 68-04-2 137-26-8

研究领域: 农业科学 · 分析化学 · 植物生理学

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JOURNAL OF HAZARDOUS MATERIALS · 2023 · IF 13.6

Magnetic biochar/quaternary phosphonium salt reduced antibiotic resistome and pathobiome on pakchoi leaves

Zhi Mei,Yuhao Fu,Fang Wang,Leilei Xiang,Fang Hu,Jean Damascene Harindintwali,Mingyi Wang,Marko Virta,Syed A. Hashsham,Xin Jiang,James M. Tiedje

Antibiotic resistance genes (ARGs) and human pathogenic bacteria (HPB) in leafy vegetable is a matter of concern as they can be transferred from soil, atmosphere, and foliar sprays, and poses a potential risk to public health. While traditional disinfection technologies are effective in reducing the presence of ARGs and HPB in soil. A new technology, foliar spraying with magnetic biochar/quaternary ammonium salt (MBQ), was demonstrated and applied to the leaf surface. High-throughput quantitative PCR targeting 96 valid ARGs and 16 S rRNA sequencing were used to assess its efficacy in reducing ARGs and HPB. The results showed that spraying MBQ reduced 97.0 ± 0.81% of “high-risk ARGs”, associated with seven classes of antibiotic resistance in pakchoi leaves within two weeks. Water washing could further reduce “high-risk ARGs” from pakchoi leaves by 19.8%− 24.6%. The relative abundance of HPB closely related to numerous ARGs was reduced by 15.2 ± 0.23% with MBQ application. Overall, this study identified the potential risk of ARGs from leafy vegetables and clarified the significant implications of MBQ application for human health as it offers a promising strategy for reducing ARGs and HPB in leafy vegetables.

研究领域: 环境科学 · 微生物学 · 农业 · 公共健康

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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE · 2020 ·Vol. 101 ·期 9 ·3595-3604 · IF 2.614

In situ and rapid determination of acetamiprid residue on cabbage leaf using surface-enhanced Raman scattering

Ting-tiao Pan,Wang Guo,Ping Lu,Deyu Hu

BACKGROUND Pesticide residues in agricultural products and foods pose a serious threat to human health, and therefore a simple, rapid and direct method is urgently needed for pesticide residue detection. In addition to realizing the detection of acetamiprid in cabbage extract solution, the main target of this study was to establish an in situ surface-enhanced Raman scattering (SERS) method, which could directly detect acetamiprid residue on cabbage leaf without the need for extraction. Acetamiprid was first used to contaminate the surface of fresh cabbage leaf, and then bimetallic silver-coated gold nanoparticles (Au@AgNPs) were added on the contaminated spots and dried for SERS measurement. RESULTS Results suggested that acetamiprid can be detected in cabbage extract and on cabbage leaf surface in situ using the SERS method based on the Au@AgNPs substrate. The limit of detection was 0.08 μg mL −1 in cabbage extract and 0.14 mg kg −1 on cabbage leaf, the recovery ranged from 80.5% to 105.5% and the relative standard deviation was in the range 4.37–10.63%. CONCLUSIONS The proposed SERS method provides an in situ , nondestructive and rapid way to detect acetamiprid residue on the surface of fruits and vegetables, which could serve as an auxiliary approach for early screening of contaminated produce in field or on site in the future. © 2020 Society of Chemical Industry

CAS / MDL: 50-81-7 16961-25-4 7761-88-8 68-04-2

研究领域: 分析化学 · 食品科学 · 环境科学

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Real-time and in situ monitoring of organosilicon-induced thiram penetration into cabbage leaves by surface-enhanced Raman scattering mapping

Magnetic biochar/quaternary phosphonium salt reduced antibiotic resistome and pathobiome on pakchoi leaves

In situ and rapid determination of acetamiprid residue on cabbage leaf using surface-enhanced Raman scattering