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Abdelrahaman D, Habotta OA, Ateya A, Aldarmahi AA, El-Shafei RA, Badawy MM, El-Mansy AA, A-Elgadir TM, Nada AM, Elhadidy MG, Hamza E, Alwutayed KM, El-Sherbiny M, Fericean L, Imbrea F, Abdeen A. Nootkatone Counteracts Melamine-Mediated Nephrotoxicity via Modulation of Intermediate Filament Proteins, Oxidative, Inflammatory, and Apoptotic Events. Drug Des Devel Ther 2024; 18:2989-3004. [PMID: 39050805 PMCID: PMC11268755 DOI: 10.2147/dddt.s466286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 06/18/2024] [Indexed: 07/27/2024] Open
Abstract
Background Nootkatone (NK), a bioactive sesquiterpene ketone, is a major ingredient in grapefruit that has distinguished biological activities. Melamine (MM), a food adulterant, was reported to induce toxic effects including renal disorders. Hence, this protocol was devoted to evaluate the renoprotective impact of NK toward MM-evoked renal damage. Methods Rats were either exposed to MM (700 mg/kg) or a combination of MM and two doses of NK (5 and 10 mg/kg). Results The results showed that NK therapy notably decreased the kidney functional parameters, along with KIM-1 and NGAL expressions of MM group. Furthermore, a decrease in MDA and NO levels as well as an elevation in SOD, CAT, GSH, and SOD and NRF2 mRNA expression in the NK group demonstrated NK's ability to enhance the renal antioxidant defense of the MM group. Significant suppression in renal inflammatory markers was achieved by NK via lessening of IL-1β and TNF-α, besides downregulation of NF-κB and IL-1β expressions. NK also downregulated vimentin, nestin, and desmin in the MM group. Additionally, in response to the MM exposure, NK hindered renal apoptosis by decreasing caspase-3 expression and restoring renal histopathological features. Conclusion These outcomes suggest that NK can be considered as a prospective candidate to guard against MM exposure-mediated renal toxic effects.
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Affiliation(s)
- Doaa Abdelrahaman
- Department of Internal Medicine, College of Medicine, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Ola A Habotta
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Ahmed Ateya
- Department of Animal Husbandry and Wealth Development, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Ahmed A Aldarmahi
- Department of Basic Science, College of Science and Health Professions, King Saud Bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia
- National Guard- Health Affairs, King Abdullah International Medical Research Centre, Jeddah, 21582, Saudi Arabia
| | - Reham A El-Shafei
- Department of Pharmacology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Mohamed M Badawy
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Delta University for Science and Technology, Gamasa, Egypt
| | - Ahmed A El-Mansy
- Department of Basic Medical and Dental Sciences, Faculty of Dentistry, Zarqa University, Zarqa, Jordan
- Department of Medical Histology and Cell Biology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Thoraya M A-Elgadir
- Department of Clinical Biochemistry, College of Medicine, King Khalid University, Abha, Saudi Arabia
| | - Aml M Nada
- Department of Internal Medicine and Endocrinology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Mona G Elhadidy
- Department of Medical Physiology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
- Department of Medical Physiology, Faculty of Medicine, Al-Baha University, Al Aqiq, Saudi Arabia
| | - Eman Hamza
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
- Department of Medical Biochemistry and Molecular Biology, Horus University, Damietta, Egypt
| | - Khairiah M Alwutayed
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Mohamed El-Sherbiny
- Department of Basic Medical Sciences, College of Medicine, AlMaarefa University, Riyadh, 11597, Saudi Arabia
| | - Liana Fericean
- Department of Biology and Plant Protection, Faculty of Agriculture, University of Life Sciences “king Michael I” from Timișoara, Calea Aradului, Romania
| | - Florin Imbrea
- Department of Crop Science, Faculty of Agriculture, University of Life Sciences “King Mihai I” from Timisoara, Calea Aradului, Romania
| | - Ahmed Abdeen
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Benha University, Toukh, Egypt
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Habotta OA, Abdeen A, Roomi AB, Elgndy AI, Sorour SM, Morsi MH, Kamal KM, Ibrahim SF, Abdelrahaman D, Fericean L, Banatean-Dunea I, Ghamry HI, El-Nablaway M, Atawia RT, Abdelhady D. Nootkatone Mitigated Melamine-Evoked Hepatotoxicity by Featuring Oxidative Stress and Inflammation Interconnected Mechanisms: In Vivo and In Silico Approaches. TOXICS 2023; 11:784. [PMID: 37755794 PMCID: PMC10535958 DOI: 10.3390/toxics11090784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/10/2023] [Accepted: 09/13/2023] [Indexed: 09/28/2023]
Abstract
Melamine (ML) is a common environmental contaminant, commonly used in food fraud, representing a serious health hazard and jeopardizing human and animal health. Recently, nootkatone (NK), a naturally occurring sesquiterpenoid, has garnered considerable attention due to its potential therapeutic advantages. We investigated the potential mechanisms underlying the protective effects of NK against ML-induced liver injury in rats. Five groups were utilized: control, ML, NK10, ML-NK5, and ML-NK10. ML induced substantial hepatotoxicity, including considerable alterations in biochemical parameters and histology. The oxidative distress triggered by ML increased the generation of malondialdehyde (MDA) and nitric oxide (NO) and decreased levels of reduced glutathione (GSH), catalase (CAT), and superoxide dismutase (SOD) activities. In addition, decreased expression of nuclear factor-erythroid 2-related factor 2 (Nrf2) and increased nuclear factor kappa beta (NF-κB) expression levels were observed in hepatocytes, which indicated the occurrence of inflammatory changes following ML exposure. These alterations were alleviated by NK supplementation in a dose-dependent manner. The data revealed that the favorable effects of NK were attributed, at least in part, to its antioxidant and anti-inflammatory properties. Moreover, our results were supported by molecular docking studies that revealed a good fit and interactions between NK and antioxidant enzymes. Thus, the current study demonstrated that NK is a potential new food additive for the prevention or treatment of ML-induced toxicity.
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Affiliation(s)
- Ola A. Habotta
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
| | - Ahmed Abdeen
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Benha University, Toukh 13736, Egypt
| | - Ali B. Roomi
- Department of Quality Assurance, University of Thi-Qar, Thi-Qar, Nasiriyah 64001, Iraq
- Department of Medical Laboratory, College of Health and Medical Technology, National University of Science and Technology, Thi-Qar, Nasiriyah 64001, Iraq
| | - Afnan I. Elgndy
- Department of Physiology, Faculty of Medicine, Benha University, Benha 13518, Egypt
| | - Safwa M. Sorour
- Department of Pharmacology, Faculty of Medicine, Benha University, Benha 13518, Egypt
| | - Maha H. Morsi
- Department of Clinical and Chemical Pathology, Faculty of Applied Health Sciences Technology, Misr University for Science and Technology, Giza 3236101, Egypt
| | - Kamal M. Kamal
- Department of Anatomy and Embryology, Faculty of Medicine, Benha University, Benha 13518, Egypt
| | - Samah F. Ibrahim
- Department of Clinical Sciences, College of Medicine, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Doaa Abdelrahaman
- Department of Basic Sciences, Faculty of Medicine, Al-Azhar University, Cairo 11751, Egypt
| | - Liana Fericean
- Department of Biology and Plant Protection, Faculty of Agriculture, University of Life Sciences “King Michael I” from Timișoara, Calea Aradului 119, CUI 3487181, 300645 Timisoara, Romania
| | - Ioan Banatean-Dunea
- Department of Biology and Plant Protection, Faculty of Agriculture, University of Life Sciences “King Michael I” from Timișoara, Calea Aradului 119, CUI 3487181, 300645 Timisoara, Romania
| | - Heba I. Ghamry
- Nutrition and Food Sciences, Department of Home Economics, Faculty of Home Economics, King Khalid University, P.O. Box 960, Abha 61421, Saudi Arabia
| | - Mohammad El-Nablaway
- Department of Medical Biochemistry, Faculty of Medicine, Mansoura University, Mansoura 35516, Egypt
- Department of Basic Medical Sciences, College of Medicine, AlMaarefa University, P.O. Box 71666, Riyadh 11597, Saudi Arabia
| | - Reem T. Atawia
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Ain Shams University, Cairo 11566, Egypt
- Department of Pharmaceutical Sciences, College of Pharmacy, Southwestern Oklahoma State University, Weatherford, OK 73096, USA
| | - Dania Abdelhady
- Department of Physiology, Faculty of Medicine, Benha University, Benha 13518, Egypt
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3
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Wang T, Huang X, Liu J, Liu W, Yang Z, He K, Chen J, Zhao L. Prolonged exposure to the herbicide atrazine promotes kidney fibrosis by activating Wnt/β-catenin signaling in rats. ENVIRONMENTAL TOXICOLOGY 2023; 38:1143-1152. [PMID: 36773304 DOI: 10.1002/tox.23754] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 01/21/2023] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
Exposure to atrazine (ATR), a widely-used herbicide, is a potential harmful to human health due to its long-term environmental persistence and bioaccumulation. The effects of chronic exposure to ATR on renal function in rats were evaluated in this research. Female Sprague-Dawley rats at 4 weeks of age were treated with different concentrations of ATR for 6 months. No significant differences in terms of renal functions were observed after ATR treatment. In histopathological examination of the kidney, Hematoxylin-Eosin staining indicated the development of degenerative changes in a dose-dependent manner. The results revealed that ATR exposure leads to renal fibrosis and that activation of the Wnt/β-catenin pathway plays a potential role in ATR-related renal fibrosis. Levels of transforming growth factor (TGF)-β and TGF-β1 levels and the reactive oxygen species were significantly upregulated after ATR treatment. In conclusion, long-term exposure to ATR could cause kidney fibrosis, which is the result of epithelial-mesenchymal transition caused by inflammation and oxidative stress.
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Affiliation(s)
- Taiwei Wang
- Department of Rehabilitation, School of Nursing, Jilin University, Changchun, China
| | - Xuemiao Huang
- Department of Rehabilitation, School of Nursing, Jilin University, Changchun, China
| | - Jian Liu
- Department of Gynecology and Obstetrics, The Second Hospital, Jilin University, Changchun, China
| | - Wei Liu
- Environmental Assessment Center, Jilin Academy of Environmental Sciences, Changchun, China
| | - Zhaoyun Yang
- Department of Rehabilitation, School of Nursing, Jilin University, Changchun, China
| | - Kang He
- Department of Rehabilitation, School of Nursing, Jilin University, Changchun, China
| | - Junyu Chen
- Department of Gynecology and Obstetrics, The Second Hospital, Jilin University, Changchun, China
| | - Lijing Zhao
- Department of Rehabilitation, School of Nursing, Jilin University, Changchun, China
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Zhou Q, Xu Z, Liu Z. Molecularly Imprinting–Aptamer Techniques and Their Applications in Molecular Recognition. BIOSENSORS 2022; 12:bios12080576. [PMID: 36004972 PMCID: PMC9406215 DOI: 10.3390/bios12080576] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/24/2022] [Accepted: 07/26/2022] [Indexed: 11/18/2022]
Abstract
Molecular imprinting–aptamer techniques exhibit the advantages of molecular imprinting and aptamer technology. Hybrids of molecularly imprinted polymer–aptamer (MIP–aptamer) prepared by this technique have higher stability, binding affinity and superior selectivity than conventional molecularly imprinted polymers or aptamers. In recent years, molecular imprinting–aptamer technologies have attracted considerable interest for the selective recognition of target molecules in complex sample matrices and have been used in molecular recognition such as antibiotics, proteins, viruses and pesticides. This review introduced the development of molecular imprinting–aptamer-combining technologies and summarized the mechanism of MIP–aptamer formation. Meanwhile, we discussed the challenges in preparing MIP–aptamer. Finally, we summarized the application of MIP–aptamer to the molecular recognition in disease diagnosis, environmental analysis, food safety and other fields.
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5
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Yang W, Liang C, Zhang X, Tian X, Ren C, Chen S, Wang J, Zhang J. Melamine induced changes in histopathology of the main organs and transcriptional levels of MAPK signaling genes in kidneys of female mice. ENVIRONMENTAL TOXICOLOGY 2022; 37:585-592. [PMID: 34842327 DOI: 10.1002/tox.23424] [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: 09/01/2021] [Revised: 11/10/2021] [Accepted: 11/20/2021] [Indexed: 06/13/2023]
Abstract
Melamine is an important chemical raw material used in industries, which has potential health risks to animals and humans. Current research mainly focuses on the toxic effects of high-dose melamine ingestion. However, there are few reports on whether melamine at the current limited standard dose has adverse effects on various tissues and organs, and whether there are sensitive target genes for risk evaluation. For this, 24 female Kunming mice were fed 0, 1.8-, 3.6-, and 7.2- mg/kg/d melamine via drinking water for consecutive 28 days, respectively. The morphological changes of the ovarian, hepatic, and renal tissues were firstly observed. The results demonstrated that the histopathology of ovary, liver, and especially in kidney had been altered by melamine intake in female. And then, the transcriptional levels of MAPK signaling genes including p38, ERK1, ERK2, JNK1, and JNK2 in kidneys were investigated by real-time PCR. The data showed that ERK1 and p38 mRNAs expressions were up-regulated significantly by melamine, suggesting that ERK1 and p38 transcriptional levels in the kidney might to be considered as candidate targets for lower-dose melamine toxicity. This study not only provides potential targets for the diagnosis and prevention of melamine damage, but also helps to assess the health risks of the current minimum allowable levels of melamine in food and environment.
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Affiliation(s)
- Wei Yang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Chen Liang
- College of Animal Science, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Xiaoyan Zhang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Xiaohui Tian
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Chenxia Ren
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Shuming Chen
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Jundong Wang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
| | - Jianhai Zhang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, People's Republic of China
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Chen S, Yang W, Zhang X, Jin J, Liang C, Wang J, Zhang J. Melamine induces reproductive dysfunction via down-regulated the phosphorylation of p38 and downstream transcription factors Max and Sap1a in mice testes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 770:144727. [PMID: 33736362 DOI: 10.1016/j.scitotenv.2020.144727] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 12/19/2020] [Accepted: 12/21/2020] [Indexed: 06/12/2023]
Abstract
Melamine poisoning incidents and potential health risks raise global attention. Recent studies imply that melamine exposure is related to male reproductive dysfunction, however, the underlying mechanisms are unclear. In this study, 32 male Kunming mice were administered with 0, 12.5, 25, and 50 mg/L melamine via drinking water for 13 weeks, respectively. Sperm quality, testicular morphology, and the mRNA expression levels of MAPK family members p38, ERK5, ERK1/2, JNK1/2/3 and their downstream transcription factors GADD153, MAX, MEF2C, CREB, c-Myc, JunD, c-JUN, Sap1a, p53, ATF-2, Elk1, and Nur77 in testes were investigated. The results revealed that low-dose melamine exposure reduced sperm quality, altered the testicular histological structure, and reduced the mRNA expression levels of p38, ERK1/2, MAX and Sap1a in the testes. The p38 and phosphorylated-p38 expressions analysis further suggested that the down-regulated phosphorylation of p38 and downstream transcription factors MAX and Sap1a play key roles in male reproductive dysfunction caused by melamine. Altogether, our study provides a new insight to elucidate the underlying mechanisms by which melamine induces male reproductive toxicity, and to evaluate the health risks of melamine.
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Affiliation(s)
- Shuming Chen
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Wei Yang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Xiaoyan Zhang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jiyin Jin
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Chen Liang
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jundong Wang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jianhai Zhang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China.
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7
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Wang M, Zhao W, Lei S, Zou W, Hu W, Liu H, Guo Z, Ren L, Zhou X, Chen Z. Rational design of MnO nanoparticles assemblies for sensitive magnetic relaxation detection of melamine. Talanta 2020; 208:120359. [PMID: 31816689 DOI: 10.1016/j.talanta.2019.120359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 09/05/2019] [Accepted: 09/14/2019] [Indexed: 12/01/2022]
Abstract
A versatile protocol has been developed for highly sensitive magnetic relaxation detection of the analyte based on the fabrication of MnO nanoparticles (NPs) assemblies. Based on the strategy that positively charged analyte could induce the assembly of negatively charged MnO NPs through electrostatic interaction, which will generate the change of magnetic relaxation rate of MnO NPs, we achieved highly sensitive and convenient detection of the analytes. By applying the detection of melamine as an example, we found that the detection limit can be as low as 0.733 ppb. Furthermore, this strategy has been applied for the initially detection of commercially available milk spiked with melamine as proof of its potential applicability of detection in complicated food samples.
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Affiliation(s)
- Muxue Wang
- Department of Biomaterials, College of Materials, Xiamen, 361005, People's Republic of China
| | - Wen Zhao
- Department of Biomaterials, College of Materials, Xiamen, 361005, People's Republic of China
| | - Shenglan Lei
- Department of Biomaterials, College of Materials, Xiamen, 361005, People's Republic of China
| | - Wenqiong Zou
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Research, School of Electronic Science and Engineering, Xiamen University, Xiamen, 361005, People's Republic of China
| | - Wenxin Hu
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02115, United States
| | - Huihui Liu
- Hubei Provincial Key Laboratory of Natural Product Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, People's Republic of China
| | - Zhiyong Guo
- Hubei Provincial Key Laboratory of Natural Product Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, People's Republic of China
| | - Lei Ren
- Department of Biomaterials, College of Materials, Xiamen, 361005, People's Republic of China
| | - Xi Zhou
- Department of Biomaterials, College of Materials, Xiamen, 361005, People's Republic of China; Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02115, United States.
| | - Zhiwei Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Research, School of Electronic Science and Engineering, Xiamen University, Xiamen, 361005, People's Republic of China; Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02115, United States.
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Zhuang Q, Sun L, Ni Y. One-step synthesis of graphitic carbon nitride nanosheets with the help of melamine and its application for fluorescence detection of mercuric ions. Talanta 2016; 164:458-462. [PMID: 28107958 DOI: 10.1016/j.talanta.2016.12.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 12/01/2016] [Accepted: 12/04/2016] [Indexed: 01/01/2023]
Abstract
A facile, simple, and relatively environment-friendly hydrothermal approach was developed for one-step synthesis of graphitic carbon nitride nanosheets (GCNNs) using melamine and sodium citrate as the precursors. The prepared GCNNs emit strong fluorescence with a high quantum yield of 48.3%. The GCNNs were then characterized by various techniques including transmission electron microscopy, atomic force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and UV-Vis absorption spectroscopy. In addition, the fluorescence quenching behavior of the GCNNS by mercuric ions (Hg2+) was exploited to fabricate a label-free fluorescence quenching sensor for sensitive and selective detection of Hg2+. The results showed that there existed a linear relationship between the fluorescence intensity and the concentration of Hg2+ from 0.001 to 1.0μM with a detection limit of 0.3nM. Finally, the sensor was successfully used to detection of Hg2+ in water and milk samples.
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Affiliation(s)
- Qianfen Zhuang
- College of Chemistry, Nanchang University, Nanchang 330031, China
| | - Liming Sun
- College of Chemistry, Nanchang University, Nanchang 330031, China
| | - Yongnian Ni
- College of Chemistry, Nanchang University, Nanchang 330031, China; State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
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9
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Guan X, Deng Y. Melamine-associated urinary stone. Int J Surg 2016; 36:613-617. [PMID: 27845270 DOI: 10.1016/j.ijsu.2016.11.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 11/02/2016] [Accepted: 11/02/2016] [Indexed: 11/28/2022]
Abstract
The devastating contamination of milk formula with Melamine, which caused havoc in China, happened almost eight years ago. Although most patients with melamine-associated urinary stone were given conservative medical treatment, the impact was not completely eliminated. Extensive studies are needed to assess chronic effects in the affected population. In this review, we describe the pathogenesis, pathology, clinical manifestations, management and epidemiology; and the need for longer term follow-up of melamine-associated urinary stones.
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Affiliation(s)
- Xiaofeng Guan
- Department of Urology, The First Affiliated Hospital of Guangxi Medical University, China.
| | - Yaoliang Deng
- Department of Urology, The First Affiliated Hospital of Guangxi Medical University, China.
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