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Malhat F, Mahmoud M, Barakat DA, Ibrahim ED, Elgammal H, Hussien M, Saber AN. Dissipation behavior, residue distribution, and exposure risk assessment of tebufenpyrad and milbemectin acaricides in strawberries under open field conditions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:35194-35205. [PMID: 38724845 DOI: 10.1007/s11356-024-33200-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 03/31/2024] [Indexed: 05/30/2024]
Abstract
Strawberries are a favorite fruit for most people, but the residues of pesticides on strawberries might be risky to human health. Tebufenpyrad and milbemectin are broad-spectrum acaricides with insecticide properties authorized for use on strawberries in Egypt. As a result, it is crucial to investigate their residues in the final product to ensure customers' safety. Consequently, field trials were conducted following the Good Agricultural Practices (GAPs) to study the dissipation rate and terminal residues of tebufenpyrad and milbemectin on strawberries. Tebufenpyrad and milbemectin residues in strawberries declined due to first-order decay process, showing significant degradation (88.5% and 94.7%, respectively) after 14 days. Risk assessment study was carried out by comparing the national estimated daily intake (NEDI) to the acceptable daily intake (ADI). The results demonstrated that the dietary risk posed by the residues of tebufenpyrad and milbemectin in strawberry fruits was acceptable for consumers. It is envisaged that the current study's findings would support the safe application of tebufenpyrad and milbemectin to strawberries and perhaps other crops in Egypt and other countries with similar climatic conditions.
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Affiliation(s)
- Farag Malhat
- Pesticide Residues and Environmental Pollution Department, Central Agricultural Pesticide Laboratory, Agricultural Research Center, Dokki, 12618, Giza, Egypt
| | - Mostafa Mahmoud
- Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, 12613, Egypt
| | - Dalia A Barakat
- Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, 12613, Egypt
| | - El-Desoky Ibrahim
- Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, 12613, Egypt
| | - Hassan Elgammal
- Central Laboratory of Residue Analysis of Pesticides and Heavy Metals in Foods, Agricultural Research Center, Dokki, 12311, Giza, Egypt
| | - Mohamed Hussien
- Department of Chemistry, Faculty of Science, King Khalid University, 61413, Abha, Saudi Arabia
- Department of Pesticide Formulation, Central Agricultural Pesticide Laboratory, Agricultural Research Center, Dokki, 12618, Giza, Egypt
| | - Ayman N Saber
- Pesticide Residues and Environmental Pollution Department, Central Agricultural Pesticide Laboratory, Agricultural Research Center, Dokki, 12618, Giza, Egypt.
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Wang Z, Yu J, Zhao L, Niu T, Wang X. Efficient discovery of active isolates from Dioscorea spongiosa by the combination of bioassay-guided macroporous resin column chromatography and high-speed counter-current chromatography. J Sep Sci 2024; 47:e2300741. [PMID: 38356225 DOI: 10.1002/jssc.202300741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/25/2023] [Accepted: 12/15/2023] [Indexed: 02/16/2024]
Abstract
In the present study, twelve compounds from Dioscorea spongiosa were successfully purified by an efficient technique combined bioassay-guided fractionation macroporous resin column chromatography (MRCC) pretreatment and high-speed counter-current chromatography (HSCCC) separation for the first time. Then, D101 MRCC was used to fractionate the crude extract into five parts, which further applied the bioassay-guided fractionation strategy to screen the active fractions of 2 and 4. As for the separation, 200 mg Fr.2 was purified by HSCCC using EtOAc/n-BuOH/H2 O (2:2:3, v/v), leading to annulatomarin (1), dioscoresides C (2), diosniponol C (3), methyl protodioscin (4), pseudoprotodioscin (5), protogracillin (6), as well as 200 mg Fr.4 yielding montroumarin (7), dioscorone A (8), diosniponol D (9), protodioscin (10), gracillin (11), and dioscin (12) using CH2 Cl2 /MeOH/H2 O (3:3:2, v/v) with the purities over 95.0%. Finally, the isolates were assayed for their anti-inflammatory, urico-lowering, and anti-diabetic activities in vitro, which indicated that the steroidal saponins of 5, 6, and 11 showed all these three activities.
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Affiliation(s)
- Zhenqiang Wang
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, China
- Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
- Key Laboratory for Natural Active Pharmaceutical Constituents Research in Universities of Shandong Province, School of Pharmaceutical Sciences, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
| | - Jinqian Yu
- Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
- Key Laboratory for Natural Active Pharmaceutical Constituents Research in Universities of Shandong Province, School of Pharmaceutical Sciences, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
| | - Lei Zhao
- Chemical Technology Research Institute of Shandong, Qingdao University of Science and Technology, Jinan, P. R. China
| | - Tong Niu
- Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
- Key Laboratory for Natural Active Pharmaceutical Constituents Research in Universities of Shandong Province, School of Pharmaceutical Sciences, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
| | - Xiao Wang
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, China
- Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
- Key Laboratory for Natural Active Pharmaceutical Constituents Research in Universities of Shandong Province, School of Pharmaceutical Sciences, Shandong Academy of Sciences, Qilu University of Technology, Jinan, China
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Dembowski M, Rasmussen HE, Rowley JE, Droessler JE, Goff GS, May I. Separation of rare earth element radioisotopes by reverse-phase high-speed counter-current chromatography. J Chromatogr A 2023; 1712:464478. [PMID: 37926007 DOI: 10.1016/j.chroma.2023.464478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 11/07/2023]
Abstract
Analytical scale purification of rare earth element (REE) radioisotopes is typically accomplished using cation-exchange resins (e.g. AG 50W-X8) and high-performance liquid chromatography (HPLC). Despite the variety of improvements made since the development of this separation process in the 1950s, nearest neighbor separations remain a challenge, as does the issue of irreversible sample adsorption. Herein, we report a study that evaluates the potential of high-speed counter-current chromatography (HSCCC) as an alternative method for purifying REE elements, with specific reference to separations of fission product REE of interest to nuclear forensics. Complementary HSCCC REE separation experiments, one spiked with radiotracer and REE fission product activity, allowed for in depth analysis of resulting fractions from both an elemental (inductively coupled plasma atomic emission spectroscopy, ICP-AES) and radiological (gamma-ray spectrometry, beta counting) purity perspective. The highly reproducible nature of separation profiles generated from HSCCC instruments was leveraged to simplify work-up of samples containing radioisotopes. Subsequent radioanalytical evaluation revealed minimal carryover of Eu into neighboring Sm and Tb fractions (as indicated by presence of 150Eu), and trace contamination of the Tb fraction with Y (as indicated by presence of 91Y). Subtle differences in stationary phase retention across the two columns were reflected in significant variations in decontamination factors of duplicate parallel separations. These differences paired with obtained distribution of radioisotopes provided valuable insights into future improvements. Collectively, this study represents a significant step forward in development of HSCCC technology for task specific REE radioisotope purification.
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Affiliation(s)
- Mateusz Dembowski
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States.
| | - Hope E Rasmussen
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | - John E Rowley
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | | | - George S Goff
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | - Iain May
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States
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