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Hu X, Carter J, Ge T, Liao M, Margaret Stephens A, Mclnnes EF, Padia F, Lu JR. Impacts of chain and head lengths of nonionic alkyl ethoxylate surfactants on cytotoxicity to human corneal and skin cells in agri-spraying processes*. J Colloid Interface Sci 2022; 628:162-173. [DOI: 10.1016/j.jcis.2022.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/19/2022] [Accepted: 08/03/2022] [Indexed: 10/15/2022]
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Zhang J, Zhou T, Zeng J, Yin X, Lan Y, Wen S. Effects of temperature and humidity on the contact angle of pesticide droplets on rice leaf surfaces. JOURNAL OF PESTICIDE SCIENCE 2022; 47:59-68. [PMID: 35800396 PMCID: PMC9184250 DOI: 10.1584/jpestics.d21-068] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/17/2022] [Indexed: 06/15/2023]
Abstract
The effects of external factors such as temperature, humidity, pesticide formulation, and pesticide concentration on the contact angle of pesticide droplets on rice leaf surfaces were analyzed. The experiments showed that there were significant differences in the contact angles of droplets on the leaf surfaces under different temperatures and humidity. As the ambient temperature increased, the contact angle first decreased and then increased, reaching a minimum value at 25°C. With a gradual increase in humidity, the contact angle significantly increased and reached a maximum at 100% humidity. Finally, it was concluded that both the formulation and concentration of the pesticide had a significant effect on the contact angle of droplets on rice leaf surfaces. The experiments also illustrated that the effects of the pesticide formulation and concentration on the contact angle were more significant than those of temperature and humidity.
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Affiliation(s)
- Jiantao Zhang
- College of Mathematics and Informatics, South China Agricultural University, Guangzhou 510642, China
- National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China
| | - Tengyuan Zhou
- College of Mathematics and Informatics, South China Agricultural University, Guangzhou 510642, China
- National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China
| | - Jiajun Zeng
- College of Mathematics and Informatics, South China Agricultural University, Guangzhou 510642, China
- National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China
| | - Xuanchun Yin
- National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China
- Engineering College, South China Agricultural University, Guangzhou 510642, China
| | - Yubin Lan
- National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China
| | - Sheng Wen
- National Center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology, Guangzhou 510642, China
- Engineering College, South China Agricultural University, Guangzhou 510642, China
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Zhao R, Sun Z, Bird N, Gu YC, Xu Y, Zhang ZH, Wu XM. Effects of tank-mix adjuvants on physicochemical properties and dosage delivery at low dilution ratios for unmanned aerial vehicle application in paddy fields. PEST MANAGEMENT SCIENCE 2022; 78:1582-1593. [PMID: 34984795 DOI: 10.1002/ps.6777] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 12/29/2021] [Accepted: 01/04/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Unmanned aerial vehicles (UAVs) have been developed to improve the efficiency of pesticide applications, and they are now widely utilized in Asia. The deposition and retention periods of pesticides on plant surfaces present serious challenges for modern precision agriculture, as these factors directly affect pesticide bioavailability, efficacy, and loss. Tank-mix adjuvants have been utilized to improve pesticide performance, but their effects on physicochemical properties and dosage delivery at low dilutions are not well understood. RESULTS We found that different tank-mix adjuvants affected droplet impact behavior, the wetting and spreading of spray dilutions, and pesticide deposition on rice leaves by changing the physicochemical properties of spray dilutions. The adjuvant methyl oxirane polymer with oxirane, mono (3,5,5-trimethylhexyl) ether (adjuvant c) significantly reduced the dynamic surface tension of the spray dilution and inhibited the rebound of large droplets (D0 = 2 ± 0.2 mm) and spray droplets (0.2 MPa with a LU-01 nozzle) on rice leaves, and improved the wetting and spreading performance of the spray dilution on rice leaves. Field tests showed that adjuvant c could significantly increase the deposition of chlorantraniliprole on rice leaves. CONCLUSION Overall, the use of appropriate tank-mix adjuvants at low dilution ratios for UAV application in paddy fields can improve the performance of spray dilutions, increase the effective deposition and wetting spread of pesticides on rice leaves, further reduce the dosage of pesticide products and improve pesticide utilization. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Rui Zhao
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, China
| | - Zhe Sun
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, China
| | - Neal Bird
- Syngenta Jealott's Hill International Research Centre, Bracknell, Berkshire, UK
| | - Yu-Cheng Gu
- Syngenta Jealott's Hill International Research Centre, Bracknell, Berkshire, UK
| | - Yong Xu
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, China
| | - Zhen-Hua Zhang
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, China
| | - Xue-Min Wu
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, China
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Hu X, Gong H, Liu H, Wang X, Wang W, Liao M, Li Z, Ma K, Li P, Rogers S, Schweins R, Liu X, Padia F, Bell G, Lu JR. Contrasting impacts of mixed nonionic surfactant micelles on plant growth in the delivery of fungicide and herbicide. J Colloid Interface Sci 2022; 618:78-87. [PMID: 35334364 DOI: 10.1016/j.jcis.2022.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/13/2022] [Accepted: 03/01/2022] [Indexed: 10/18/2022]
Abstract
HYPOTHESIS Nonionic alkyl ethoxylate surfactants are widely used in agrochemicals to facilitate the permeation of systemic herbicides and fungicides across the plant waxy film. Industrial grade surfactants are often highly mixed and how the mixing affects their interactions with pesticides and wax films remains largely unexplored. A better understanding could enable design of mixed nonionic surfactants for herbicides and fungicides to maximize their efficiency and reduce wastage whilst controlling their impact on plant wax films. EXPERIMENT In this study, nonionic surfactants with general structure n-oxyethylene glycol monododecyl ether (C12En) were used to form surfactant mixtures with the same average ethoxylate numbers but different hydrophilic-lipophilic balance (HLB) values. Their mixed micellar systems were then used to solubilize a herbicide diuron (DN) and a fungicide cyprodinil (CP), followed by plant wax solubilization upon contact with wax films. These processes were monitored by 1H NMR and SANS. FINDING Pesticide solubilization made surfactant micelles effectively more hydrophobic but subsequent wax dissolution caused pesticide release and the restoration of the micellar amphiphilicity. Nonionic surfactants with lower HLBs form larger nanoaggregates, show enhanced wettability, and have better ability to solubilize and permeate pesticides across the wax film, but may cause significant damage to plant growth. These observations help explain why herbicides applied on weeds would benefit from surfactants with lower HLB values while fungicides require surfactants with HLBs to balance between delivery efficiency and potential phytotoxicity risks.
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Affiliation(s)
- Xuzhi Hu
- Biological Physics Group, Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Haoning Gong
- Biological Physics Group, Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Huayang Liu
- Biological Physics Group, Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Xi Wang
- Department of Materials, School of Natural Sciences, the University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Weimiao Wang
- Department of Materials, School of Natural Sciences, the University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Mingrui Liao
- Biological Physics Group, Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Zongyi Li
- Biological Physics Group, Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Kun Ma
- STFC ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Peixun Li
- STFC ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Sarah Rogers
- STFC ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Ralf Schweins
- Large Scale Structures Group, Institut Laue-Langevin, CS 20 156, 38042 Grenoble CEDEX 9, France
| | - Xuqing Liu
- Department of Materials, School of Natural Sciences, the University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Faheem Padia
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK
| | - Gordon Bell
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK
| | - Jian R Lu
- Biological Physics Group, Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
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Huang X, Keller AA. Metabolomic Response of Early-Stage Wheat ( Triticum aestivum) to Surfactant-Aided Foliar Application of Copper Hydroxide and Molybdenum Trioxide Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:3073. [PMID: 34835836 PMCID: PMC8622224 DOI: 10.3390/nano11113073] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/28/2021] [Accepted: 11/06/2021] [Indexed: 12/11/2022]
Abstract
Surfactants are commonly used in foliar applications to enhance interactions of active ingredients with plant leaves. We employed metabolomics to understand the effects of TritonTM X-100 surfactant (SA) and nanomaterials (NMs) on wheat (Triticum aestivum) at the molecular level. Leaves of three-week-old wheat seedlings were exposed to deionized water (DI), surfactant solution (SA), NMs-surfactant suspensions (Cu(OH)2 NMs and MoO3 NMs), and ionic-surfactant solutions (Cu IONs and Mo IONs). Wheat leaves and roots were evaluated via physiological, nutrient distribution, and targeted metabolomics analyses. SA had no impact on plant physiological parameters, however, 30+ dysregulated metabolites and 15+ perturbed metabolomic pathways were identified in wheat leaves and roots. Cu(OH)2 NMs resulted in an accumulation of 649.8 μg/g Cu in leaves; even with minimal Cu translocation, levels of 27 metabolites were significantly changed in roots. Due to the low dissolution of Cu(OH)2 NMs in SA, the low concentration of Cu IONs induced minimal plant response. In contrast, given the substantial dissolution of MoO3 NMs (35.8%), the corresponding high levels of Mo IONs resulted in significant metabolite reprogramming (30+ metabolites dysregulated). Aspartic acid, proline, chlorogenic acid, adenosine, ascorbic acid, phenylalanine, and lysine were significantly upregulated for MoO3 NMs, yet downregulated under Mo IONs condition. Surprisingly, Cu(OH)2 NMs stimulated wheat plant tissues more than MoO3 NMs. The glyoxylate/dicarboxylate metabolism (in leaves) and valine/leucine/isoleucine biosynthesis (in roots) uniquely responded to Cu(OH)2 NMs. Findings from this study provide novel insights on the use of surfactants to enhance the foliar application of nanoagrochemicals.
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Affiliation(s)
- Xiangning Huang
- Center for Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, USA;
| | - Arturo A. Keller
- Center for Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, USA;
- Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, USA
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Synthesis and properties of stellate lactosamide quaternary ammonium surfactants. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Liao YF, Zhou MH, Zhang Y, Peng YY, Jian JX, Lu F, Tong QX. Facile synthesis and marked pH-responsive behavior of novel foaming agents based on amide- and ester-linked morpholine fluorosurfactants. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Wan Q, Zhao J, Li H, Li H, Wang C, Pan B. The wetting behavior of three different types of aqueous surfactant solutions on housefly (Musca domestica) surfaces. PEST MANAGEMENT SCIENCE 2020; 76:1085-1093. [PMID: 31525272 DOI: 10.1002/ps.5620] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/07/2019] [Accepted: 09/12/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND It is difficult for insecticide spray droplets to adhere to highly hydrophobic pest surfaces, and this is an important reason behind the low utilization of pesticides. Greater understanding of the wetting behaviors of agro-surfactants on pest surfaces is of great importance in pesticidal applications. RESULTS This research investigated the wetting processes of three surfactant solutions [TritonX-100 (TX-100), sodium dodecyl sulfate (SDS) and dodecyl trimethyl ammonium bromide (DTAB)] on housefly surfaces based on surface tension, contact angles and solid-liquid interaction. As the surfactant concentration increased, the wetting abilities of the solutions improved due a decrease in liquid surface tension. The decrease in contact angles followed an inverted 'S' shape until the concentration exceeded the critical micelle concentration, at which point surfactant adsorption was saturated at the interfaces. The nonionic surfactant TX-100 enhanced wettability more than the ionic surfactants SDS and DTAB. The wetting states of the three surfactant solutions on housefly surfaces transformed to the Wenzel state when the surfactant molecules adsorbed at solid-liquid interfaces (ΓSL ) were 3.09-5.36 times higher than those adsorbed at liquid-air interfaces (ΓLV ). More insecticides attached to housefly surfaces and pesticide utilization was significantly improved after adding TX-100 to the pesticide solution. CONCLUSION Surfactant TX-100 could be a practical and efficient candidate adjuvant for insecticide spraying of houseflies. This research investigated the wetting mechanism of three different types of surfactant solutions on housefly surfaces, and could provide effective guidance for the preparation of insecticide formulations and pesticide adjuvants with better wettability to improve pesticide utilization. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Qiang Wan
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Jiayi Zhao
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Hao Li
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Huan Li
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Chuanwen Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Baoliang Pan
- College of Veterinary Medicine, China Agricultural University, Beijing, China
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Chen CL, Liao YF, Lu F, Zheng YS, Peng YY, Ding CW, Tong QX. Facile synthesis, surface activity, wettability and ultrahigh foaming properties of novel nonionic Gemini fluorocarbon surfactants. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112469] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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