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Ding G, Gao X, Tan Y, Hao Z, Wang X, Zhang C, Deng A. Local application of silver nitrate as an adjuvant treatment before deep lamellar keratoplasty for fungal keratitis poorly responsive to medical treatment. Front Med (Lausanne) 2024; 10:1292701. [PMID: 38317754 PMCID: PMC10838974 DOI: 10.3389/fmed.2023.1292701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 12/11/2023] [Indexed: 02/07/2024] Open
Abstract
Objective The purpose of this study is to evaluate the efficacy and safety of the local application of silver nitrate (LASN) as an adjuvant treatment before deep lamellar keratoplasty (DLKP) for fungal keratitis responding poorly to medical treatment. Methods A total of 12 patients (12 eyes) with fungal keratitis responding poorly to medical treatment (for at least 2 weeks) were included. LASN was performed using 2% silver nitrate, the ulcer was cleaned and debrided, and then, the silver nitrate cotton stick was applied to the surface of the ulcer for a few seconds. The effect of LASN was recorded. The number of hyphae before and after treatment was determined by confocal microscope. After the condition of the ulcer improved, DLKP was performed. Fungal recurrence, best-corrected visual acuity (BCVA), loose sutures, and endothelial cell density (ECD) were recorded in detail. Results Clinical resolution of corneal infiltration and edema was observed, and the ulcer boundary became clear in all 12 patients after 7-9 days of LASN. Confocal microscopy showed that the number of hyphae was significantly reduced. Ocular pain peaked on days 1 and 2 after treatment, and 9 patients (75%, day 1) and 1 patient (8.3%, day 2) required oral pain medication. During the follow-up period after DLKP, no fungal recurrence and loose sutures were observed. After the operation, the BCVA of all patients improved. The mean corneal ECD was 2,166.83 ± 119.75 cells/mm2. Conclusion The LASN was safe and effective and can be well tolerated by patients. Eye pain can be relieved quickly. LASN as an adjuvant treatment before DLKP might be a promising therapeutic strategy.
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Affiliation(s)
- Gang Ding
- Department of Ophthalmology, The Jinan Second People's Hospital, Jinan, China
| | - Xin Gao
- Department of Ophthalmology, The Jinan Second People's Hospital, Jinan, China
| | - Yue Tan
- Department of Ophthalmology, The Jinan Second People's Hospital, Jinan, China
| | - Zhongkai Hao
- Department of Ophthalmology, School of Clinical Medicine, Weifang Medical University, Weifang, China
| | - Ximing Wang
- Department of Ophthalmology, The Jinan Second People's Hospital, Jinan, China
| | - Chenming Zhang
- Department of Ophthalmology, The Jinan Second People's Hospital, Jinan, China
| | - Aijun Deng
- Department of Ophthalmology, Affiliated Hospital of Weifang Medical University, Weifang, China
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Inhibition of Aspergillus flavus Growth and Aflatoxin Production in Zea mays L. Using Endophytic Aspergillus fumigatus. J Fungi (Basel) 2022; 8:jof8050482. [PMID: 35628738 PMCID: PMC9146429 DOI: 10.3390/jof8050482] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/03/2022] [Accepted: 05/04/2022] [Indexed: 11/16/2022] Open
Abstract
Aspergillus flavus infection of vegetative tissues can affect the development and integrity of the plant and poses dangerous risks on human and animal health. Thus, safe and easily applied approaches are employed to inhibit A. flavus growth. To this end, the fungal endophyte, i.e., Aspergillus fumigatus, was used as a safe biocontrol agent to reduce the growth of A. flavus and its infection in maize seedlings. Interestingly, the safe endophytic A. fumigatus exhibited antifungal activity (e.g., 77% of growth inhibition) against A. flavus. It also reduced the creation of aflatoxins, particularly aflatoxin B1 (AFB1, 90.9%). At plant level, maize seedling growth, leaves and root anatomy and the changes in redox status were estimated. Infected seeds treated with A. fumigatus significantly improved the germination rate by 88.53%. The ultrastructure of the infected leaves showed severe disturbances in the internal structures, such as lack of differentiation in cells, cracking, and lysis in the cell wall and destruction in the nucleus semi-lysis of chloroplasts. Ultrastructure observations indicated that A. fumigatus treatment increased maize (leaf and root) cell wall thickness that consequentially reduced the invasion of the pathogenic A. flavus. It was also interesting that the infected seedlings recovered after being treated with A. fumigatus, as it was observed in growth characteristics and photosynthetic pigments. Moreover, infected maize plants showed increased oxidative stress (lipid peroxidation and H2O2), which was significantly mitigated by A. fumigatus treatment. This mitigation was at least partially explained by inducing the antioxidant defense system, i.e., increased phenols and proline levels (23.3 and 31.17%, respectively) and POD, PPO, SOD and CAT enzymes activity (29.50, 57.58, 32.14 and 29.52%, respectively). Overall, our study suggests that endophytic A. fumigatus treatment could be commercially used for the safe control of aflatoxins production and for inducing biotic stress tolerance of A. flavus-infected maize plants.
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Zheng X, Wei W, Zhou W, Li H, Rao S, Gao L, Yang Z. Prevention and detoxification of patulin in apple and its products: A review. Food Res Int 2020; 140:110034. [PMID: 33648261 DOI: 10.1016/j.foodres.2020.110034] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 11/19/2020] [Accepted: 12/14/2020] [Indexed: 01/09/2023]
Abstract
Patulin-producing fungi pose an unavoidable problem for apple and its product quality, thereby threatening human and/or animal health. Studies on controlling the patulin-producing fungal growth and patulin contamination in apple and its products by physical methods, chemical fungicides, and biological methods have been performed for decades, but patulin contamination has not been addressed. Here, the important of studying regulation mechanism of patulin production in apple at the protein expression and metabolism levels is proposed, which will facilitate the development of controlling patulin production by using physical, chemical, and biological methods. Furthermore, the advantages or disadvantages and effects or mechanisms of using physical, chemical, biological methods to control the decay caused by Penicillium expansum and to remove patulin in food was discussed. The development of physical methods to remove patulin depends on the development of special equipment. Chemical methods are economical and efficient, if we have ensured that there are no unknown reactions or toxic by-products by using these chemicals. The biological method not only effectively controls the decay caused by Penicillium espansum, but also removes the toxins that already exist in the food. Degradation of patulin by microorganisms or biodegradation enzymes is an efficient and promising method to remove patulin in food if the microorganisms used and the degradation products are completely non-toxic.
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Affiliation(s)
- Xiangfeng Zheng
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Wanning Wei
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Wenyuan Zhou
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Huaxiang Li
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Shengqi Rao
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Lu Gao
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Zhenquan Yang
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China.
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Alghuthaymi MA, Abd-Elsalam KA, Shami A, Said-Galive E, Shtykova EV, Naumkin AV. Silver/Chitosan Nanocomposites: Preparation and Characterization and Their Fungicidal Activity against Dairy Cattle Toxicosis Penicillium expansum. J Fungi (Basel) 2020; 6:jof6020051. [PMID: 32325907 PMCID: PMC7345578 DOI: 10.3390/jof6020051] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/17/2020] [Accepted: 04/17/2020] [Indexed: 02/07/2023] Open
Abstract
This work aimed to evaluate the fungicide activity of chitosan-silver nanocomposites (Ag-Chit-NCs) against Penicillium expansum from feed samples. The physicochemical properties of nanocomposites were characterized by X-ray fluorescence analysis (XRF), small-angle X-ray scattering (SAXS), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The morphological integrity of the nanohybrid was confirmed by electron transmission. By the data of RFA (X-ray fluorescent analysis), the contents of Ag in Ag-chitosan composite were 5.9 w/w%. The size distribution of the Ag nanoparticles incorporated in the chitosan matrix was investigated by SAXS. The main part of the size heterogeneity distribution in the chitosan matrix corresponds to the portion of small particles (3-4 nm). TEM analysis revealed a spherical morphology in the form of non-agglomerated caps, and 72% of the nanoparticles measured up to 4 nm. The minimum inhibitory concentration of NCs was evaluated in petri dishes. Three different concentrations were tested for antifungal activity against the mycotoxigenic P. expansum strain. Changes in the mycelium structure of P. expansum fungi by scanning electron microscopy (SEM) were observed to obtain information about the mode of action of Ag-Chit-NCs. It was shown that NC-Chit-NCs with sizes in the range from 4 to 10 nm have internalized sizes in cells, form agglomerates in the cytoplasm, and bind to cell organelles. Besides, their ability to influence protein and DNA fragmentation was examined in P. expansum. SDS-PAGE explains the apparent cellular protein response to the presence of various Ag-Chit-NCs. The intensity of P. expansum hyphal cell protein lines treated with Ag-Chit-NCs was very thin, indicating that high molecular weight proteins are largely prevented from entering the electrophoretic gel, which reflects cellular protein modification and possible damage caused by the binding of several protein fragments to Ag-Chit-NCs. The current results indicate that Ag-Chit-NCs <10 nm in size have significant antifungal activity against P. expansum, the causative agent of blue mold-contaminated dairy cattle feed.
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Affiliation(s)
- Mousa A. Alghuthaymi
- Biology Department, Science and Humanities College, Shaqra University, Alquwayiyah 11726, Saudi Arabia;
| | - Kamel A. Abd-Elsalam
- Plant Pathology Research Institute, Agricultural Research Center (ARC), Giza 12619, Egypt
- Correspondence: (K.A.A.-E.); (A.S.); Tel.: +20-10-910-49161 (K.A.A.-E.); +966-11-823-3175 (A.S.)
| | - Ashwag Shami
- Biology Department, College of Sciences, Princess Nourah bint Abdulrahman University, Riyadh 11617, Saudi Arabia
- Correspondence: (K.A.A.-E.); (A.S.); Tel.: +20-10-910-49161 (K.A.A.-E.); +966-11-823-3175 (A.S.)
| | - Ernest Said-Galive
- A.N. Nesmeyanov Institute of Organoelement compounds (INEOS) of Russian Academy of Sciences, 119991 Moscow, Russia; (E.S.-G.); (A.V.N.)
| | - Eleonora V. Shtykova
- V. Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia;
| | - Alexander V. Naumkin
- A.N. Nesmeyanov Institute of Organoelement compounds (INEOS) of Russian Academy of Sciences, 119991 Moscow, Russia; (E.S.-G.); (A.V.N.)
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Pérez-de León A, Plasencia J, Vázquez-Durán A, Méndez-Albores A. Comparison of the In Vitro Antifungal and Anti-fumonigenic Activities of Copper and Silver Nanoparticles Against Fusarium verticillioides. J CLUST SCI 2019. [DOI: 10.1007/s10876-019-01638-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gómez JV, Tarazona A, Mateo F, Jiménez M, Mateo EM. Potential impact of engineered silver nanoparticles in the control of aflatoxins, ochratoxin A and the main aflatoxigenic and ochratoxigenic species affecting foods. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.02.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Medici S, Peana M, Nurchi VM, Zoroddu MA. Medical Uses of Silver: History, Myths, and Scientific Evidence. J Med Chem 2019; 62:5923-5943. [DOI: 10.1021/acs.jmedchem.8b01439] [Citation(s) in RCA: 110] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Serenella Medici
- Department of Chemistry and Pharmacy, University of Sassari, 07100 Sassari, Italy
| | - Massimiliano Peana
- Department of Chemistry and Pharmacy, University of Sassari, 07100 Sassari, Italy
| | - Valeria M. Nurchi
- Department of Life and Environmental Sciences, University of Cagliari, 09042 Cagliari, Italy
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Smaoui S, Ennouri K, Chakchouk-Mtibaa A, Sellem I, Bouchaala K, Karray-Rebai I, Mellouli L. Statistical versus artificial intelligence -based modeling for the optimization of antifungal activity against Fusarium oxysporum using Streptomyces sp. strain TN71. J Mycol Med 2018; 28:551-560. [PMID: 30057154 DOI: 10.1016/j.mycmed.2018.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/06/2018] [Accepted: 07/10/2018] [Indexed: 11/17/2022]
Abstract
A Streptomyces sp. strain TN71 was isolated from Tunisian Saharan soil and selected for its antimicrobial activity against phytopathogenic fungi. In an attempt to increase its anti-Fusarium oxysporum activity, GYM+S (glucose, yeast extract, malt extract and starch) culture medium was selected out of five different production media. Plackett-Burman design (PBD) was used to select yeast extract, malt extract and calcium carbonate (CaCO3) as parameters having significant effects on antifungal activity, and a Box-Behnken design was applied for further optimization. The analysis revealed that the optimum concentrations for the anti-F. oxysporum activity of the tested variables were yeast extract 5.03g/L, malt extract 8.05g/L and CaCO3 4.51g/L. Artificial Neural Networks (ANNs): the Multilayer perceptron (MLP) and the Radial basis function (RBF) were created to predict the anti-F. oxysporum activity. The comparison between experimental and predicted outputs from ANN and Response Surface Methodology (RSM) were studied. The ANN model presents an improvement of 14.73%. To our knowledge, this is the first work reporting the statistical versus artificial intelligence -based modeling for the optimization of bioactive molecules against mycotoxigenic and phytopathogenic fungi.
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Affiliation(s)
- S Smaoui
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia.
| | - K Ennouri
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - A Chakchouk-Mtibaa
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - I Sellem
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - K Bouchaala
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - I Karray-Rebai
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
| | - L Mellouli
- Laboratory of microorganisms and biomolecules of the centre of biotechnology of Sfax, road of Sidi Mansour Km 6, P.O. Box 1177, 3018 Sfax, Tunisia
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Ismaiel AA, Ali DMI. Antimicrobial properties of 6-pentyl-α-pyrone produced by endophytic strains of Trichoderma koningii and its effect on aflatoxin B1 production. Biologia (Bratisl) 2017. [DOI: 10.1515/biolog-2017-0173] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Abd-Elsalam KA, Hashim AF, Alghuthaymi MA, Said-Galiev E. Nanobiotechnological strategies for toxigenic fungi and mycotoxin control. FOOD PRESERVATION 2017:337-364. [DOI: 10.1016/b978-0-12-804303-5.00010-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Barbosa GP, Debone HS, Severino P, Souto EB, da Silva CF. Design and characterization of chitosan/zeolite composite films--Effect of zeolite type and zeolite dose on the film properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 60:246-254. [PMID: 26706528 DOI: 10.1016/j.msec.2015.11.034] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 10/24/2015] [Accepted: 11/11/2015] [Indexed: 12/27/2022]
Abstract
Chitosan films can be used as wound dressings for the treatment of chronic wounds and severe burns. The antimicrobial properties of these films may be enhanced by the addition of silver. Despite the antimicrobial activity of silver, several studies have reported the cytotoxicity as a factor limiting its biomedical applications. This problem may, however, be circumvented by the provision of sustained release of silver. Silver zeolites can be used as drug delivery platforms to extend the release of silver. The objective of this study was to evaluate the addition of clinoptilolite and A-type zeolites in chitosan films. Sodium zeolites were initially subjected to ion-exchange in a batch reactor. Films were prepared by casting technique using a 2% w/w chitosan solution and two zeolite doses (0.1 or 0.2% w/w). Films were characterized by thermal analysis, color analysis, scanning electron microscopy, X-ray diffraction, and water vapor permeation. The results showed that films present potential for application as dressing. The water vapor permeability is one of the main properties in wound dressings, the best results were obtained for A-type zeolite/chitosan films, which presented a brief reduction of this property in relation to zeolite-free chitosan film. On the other hand, the films containing clinoptilolite showed lower water vapor permeation, which may be also explained by the best distribution of the particles into the polymer which also promoted greater thermal resistance.
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Affiliation(s)
- Gustavo P Barbosa
- Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Diadema, Brazil
| | - Henrique S Debone
- Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Diadema, Brazil
| | - Patrícia Severino
- Universidade Tiradentes, Instituto de Tecnologia e Pesquisa, Aracaju, Brazil
| | - Eliana B Souto
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Coimbra (FFUC), Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548, Coimbra, Portugal; Center for Neuroscience and Cell Biology & Institute for Biomedical Imaging and Life Sciences (CNC-IBILI), University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548, Coimbra, Portugal
| | - Classius F da Silva
- Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Diadema, Brazil.
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Ismaiel AA, Bassyouni RH, Kamel Z, Gabr SM. Detoxification of Patulin by Kombucha tea culture. CYTA - JOURNAL OF FOOD 2015. [DOI: 10.1080/19476337.2015.1096828] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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