scholarly journals Preserving cultural heritage: Analyzing the antifungal potential of ionic liquids tested in paper restoration

2019 ◽  
Author(s):  
Kevin Schmitz ◽  
Sebastian Wagner ◽  
Manfred Reppke ◽  
Christian L. Maier ◽  
Elisabeth Windeisen-Holzhauser ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Antifungal Activity ◽  
Inhibitory Concentration ◽  
Fungal Growth ◽  
Polar Group ◽  
Relevant Paper ◽  
Ex Post ◽  
Antifungal Potential ◽  
Added Benefit

AbstractEarly industrialization and the development of cheap production processes for paper have led to an exponential accumulation of paper-based documents during the last two centuries. Archives and libraries harbor vast amounts of ancient and modern documents and have to undertake extensive endeavors to protect them from abiotic and biotic deterioration. While services for mechanical preservation such as ex post de-acidification of historic documents are already commercially available, the possibilities for long-term protection of paper-based documents against fungal attack (apart from temperature and humidity control) are very limited. Novel processes for mechanical enhancement of damaged cellulosic documents use Ionic Liquids (IL) as essential process components. With some of these ILs having azole-functionalities similar to well-known fungicides such as Clotrimazole, the possibility of antifungal activities of these ILs was proposed but has not yet been experimentally confirmed.We evaluated the potency of four ILs with potential application in paper restoration for suppression of fungal growth on five relevant paper-infesting molds. The results revealed a general antifungal activity of all ILs, which increased with the size of the non-polar group. Physiological experiments and ultimate elemental analysis allowed to determine the minimal inhibitory concentration of each IL as well as the residual IL concentration in process-treated paper. These results provide valuable guidelines for IL-applications in paper restoration processes with antifungal activity as an added benefit. With azoles remaining in the paper after the process, simultaneous repair and biotic protection in treated documents could be facilitated.

scholarly journals EVALUATION OF ANTIFUNGAL POTENTIAL OF ALLIUM AMPELOPRASUM AGAINST FUNGAL PHYTOPATHOGENS

2018 ◽  
Vol 11 (11) ◽  
pp. 129
Author(s):  
Shahid Khan ◽  
Amandeep Kaur ◽  
Neeta Raj Sharma
Keyword(s):  
Chemical Composition ◽  
Antifungal Activity ◽  
Inhibitory Concentration ◽  
Economic Importance ◽  
Allium Ampeloprasum ◽  
Water Extracts ◽  
Maximum Inhibition ◽  
Antifungal Potential ◽  
Organic Extracts ◽  
Fungal Phytopathogens

Objective: Present study evaluates the antifungal potential of Allium ampeloprasum extracts against two phytopathogens of economic importance, namely Alternaria triticina and Magnaporthe oryzae which are found to be one of the greatest threats to wheat and rice crop worldwide.Methods: Four different organic solvents, i.e., water, methanol, acetone, and hexane were used for extract preparation based on the increasing order of polarity. Further, different concentrations of these extracts were used to perform a quantitative assay for measuring the antifungal activity of extracts. Two-way analysis of variance was used to statistically analyze the results through GraphPad Prism v. 7.00.Results: The best results were shown by water extracts with a maximum inhibition of 99.39±0.2% against A. triticina and 99.39±2.2% against M. oryzae. Water extracts gave minimal inhibitory concentration 90 values at 9.94 μg/mL against M. oryzae and at 16.73 μg/mL against A. triticina.Conclusion: Water extracts of A. ampeloprasum have relatively higher potential for being used as an antifungal agent as compared to other organic extracts used in this study. Further study on the chemical composition of A. ampeloprasum water extracts can reveal potent anti-phytopathogenic fungal compounds which can be used to develop biofungicides.

scholarly journals Evaluation of Antifungal Activity and Mechanism of Action of Citral againstCandida albicans

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Maria Clerya Alvino Leite ◽  
André Parente de Brito Bezerra ◽  
Janiere Pereira de Sousa ◽  
Felipe Queiroga Sarmento Guerra ◽  
Edeltrudes de Oliveira Lima
Keyword(s):  
Cell Wall ◽  
Antifungal Activity ◽  
Mechanism Of Action ◽  
Cell Walls ◽  
Inhibitory Concentration ◽  
Minimum Fungicidal Concentration ◽  
Antifungal Potential ◽  
Kill Curve ◽  
Time Kill

Candida albicansis a yeast that commensally inhabits the human body and can cause opportunistic or pathogenic infections.Objective. To investigate the antifungal activity of citral againstC. albicans.Methodology. The minimum inhibitory concentration (MIC) and the minimum fungicidal concentration (MFC) were determined by the broth microdilution techniques. We also investigated possible citral action on cell walls (0.8 M sorbitol), cell membranes (citral to ergosterol binding), the time-kill curve, and biological activity on the yeast’s morphology.Results. The MIC and MFC of citral were, respectively, 64 µg/mL and 256 µg/mL. Involvement with the cell wall and ergosterol binding were excluded as possible mechanisms of action. In the morphological interference assay, it was observed that the product inhibited pseudohyphae and chlamydoconidia formation. The MIC and the MFC of citral required only 4 hours of exposure to effectively kill 99.9% of the inoculum.Conclusion. Citral showedin vitroantifungal potential against strains ofC. albicans. Citral’s mechanism of action does not involve the cell wall or ergosterol, and further study is needed to completely describe its effects before being used in the future as a component of new antifungals.

scholarly journals Antifungal activity of onion (Allium cepa L.) essential oil on Candida albicans

2019 ◽  
Vol 3 (1) ◽  
pp. 59
Author(s):  
Miftahur Rahmi ◽  
Felicia Aileen Agustia
Keyword(s):  
Candida Albicans ◽  
Minimum Inhibitory Concentration ◽  
Antifungal Activity ◽  
Essential Oil ◽  
Allium Cepa ◽  
Inhibitory Concentration ◽  
Fungal Growth ◽  
Diffusion Method ◽  
Minimum Concentration ◽  
Allium Cepa L

Background:Onions (Allium cepa L.) contain essential oil that have sulfur compounds called thiosulfinates  or isothiocyanates which are known to have antibacterial and antifungal effects. Minimum Inhibition Concentration (MIC) test is needed to determine the minimum concentration of onion essential oil which can inhibit or kill  fungus test. Objectives: To determine the antifungal activity of essential oil in onion (Allium cepa L.) and to find out the Minimum Inhibitory Concentration (MIC) on Candida albicans. Methods:This research was an experimental study with disc diffusion method (Kirby Bauer) using Sabourond Dextrose Agar (SDA) media. Results: The results were obtained at concentrations of 20% (C1); 10% (C2); 5% (C3); 2.5% (C4); 1.25% (C5); 0.625% (C6); and 0.312% (C7) provided inhibition with an average diameter of 13.14 mm; 9.33 mm; 8.49 mm; 6.90 mm; 0 mm; 0 mm; and 0 mm respectively. Conclusion: Essential oil of onion (Allium cepa L.) could inhibit fungal growth of Candida albicans and Minimum Inhibitory Concentration (MIC) of essential oil onions (Allium cepa L.) indicated on concentration of 2.5% with a flat diameter average of 6.90 mm.

scholarly journals Potensi Daun Pacar Air (Impatiens balsamina L.) dalam Menghambat Pertumbuhan Jamur Rhizopus oryzae L.

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Morina Adfa ◽  
Munifilia Ekasari ◽  
Avidlyandi Avidlyandi ◽  
Rochmah Supriati ◽  
Salprima Yudha S.
Keyword(s):  
Antifungal Activity ◽  
Methanol Extract ◽  
Rhizopus Oryzae ◽  
Fungal Growth ◽  
Soft Rot ◽  
Indigenous Medicine ◽  
Antitumor Activities ◽  
Impatiens Balsamina ◽  
Ic50 Value ◽  
Antifungal Potential

Pacar air (Impatiens balsamina L.) plant belongs to the Balsaminaceae family and is used as an indigenous medicine in Asia for fingernail inflammation, fractures, and rheumatism treatments. Moreover, the antipruritic, antianaphylactic, antifungal, antibacterial, and antitumor activities of some compounds, especially phenolics and quinones from this plant have been studied extensively. Therefore, this study aims to determine the antifungal activity of Pacar air leaves (Impatiens balsamina L.) methanol extract against Rhizopus oryzae L. and the IC50 value. The results showed that an increase in the concentrations of I. balsamina L. leaves methanol extract significantly raised the fungal growth. Furthermore, the extract inhibition against R. oryzae L. at various concentrations of 0.5; 0.7; 0.9; 1.1; and 1.3% w/v were 10, 21.9, 58.06, 68.06, and 79.72%, respectively, while the IC50 value was 0.896%. Hence, the presence of naphthoquinones and other secondary metabolites are responsible for its antifungal activity. Based on these results, the antifungal potential of I. balsamina L. leaves against soft-rot fungi is useful in the future.

scholarly journals Attempts to Access a Series of Pyrazoles Lead to New Hydrazones with Antifungal Potential against Candida Species Including Azole-Resistant Strains

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5861
Author(s):  
Georgiana Negru ◽  
Laure Kamus ◽  
Elena Bîcu ◽  
Sergiu Shova ◽  
Boualem Sendid ◽  
...  
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antifungal Activity ◽  
Antifungal Agents ◽  
Inhibitory Concentration ◽  
Direct Reaction ◽  
Pyrazole Derivatives ◽  
Candida Spp ◽  
X Ray ◽  
Antifungal Potential ◽  
Resistant Strains

The treatment of benzylidenemalononitriles with phenylhydrazines in refluxing ethanol did not provide pyrazole derivatives, but instead furnished hydrazones. The structure of hydrazones was secured by X-ray analysis. The chemical proof was also obtained by direct reaction of 3,4,5-trimethoxybenzaldehyde with 2,4-dichlorophenylhydrazine. Newly synthesized hydrazones were tested against eight Candida spp. strains in a dose response assay to determine the minimum inhibitory concentration (MIC99). Five compounds were identified as promising antifungal agents against Candida spp. (C. albicans SC5314, C. glabrata, C. tropicalis, C. parapsilosis and C. glabrata (R azoles)), with MIC99 values ranging from 16 to 32 µg/mL and selective antifungal activity over cytotoxicity.

scholarly journals Uji aktivitas antijamur ekstrak black garlic terhadap pertumbuhan jamur Candida albicans

2021 ◽  
Vol 10 (2) ◽  
pp. 143-157
Author(s):  
Eva Agustina ◽  
Funsu Andiarna ◽  
Irul Hidayati ◽  
Vindi Fristy Kartika
Keyword(s):  
Antibacterial Activity ◽  
Candida Albicans ◽  
Antifungal Activity ◽  
Minimal Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Fungal Growth ◽  
Inhibition Zone ◽  
Garlic Extract ◽  
Activity Test

Salah satu tanaman yang berfungsi sebagai  antijamur  adalah bawang  putih yang diinovasikan menjadi produk bawang yang berwarna hitam atau black garlic. Penelitian ini bertujuan untuk mengetahui aktivitas antijamur ekstrak black barlic terhadap pertumbuhan jamur Candida albicans. Metoda dalam penelitian ini adalah bawang putih dipanaskan selama 35 hari pada suhu 65°C untuk mendapatkan black garlic. Black garlic diekstraksi dengan metode maserasi menggunakan pelarut methanol. Uji aktivitas antibakteri berdasarkan uji zona hambat, konsentrasi hambat minimal (KHM) dan konsentrasi bunuh minimal (KBM). Uji zona hambat dengan variasi konsentrasi ekstrak 100%, 90% dan 80%. Konsentrasi dengan nilai zona hambat yang baik akan dilanjutkan ke uji KHM dan KBM dengan pengenceran ke 1 sampai 5. Hasil penelitian menunjukkan bahwa zona hambat ekstrak Black Garlic dengan konsentrasi 100% memiliki zona hambat paling bagus yaitu 3,15 mm. Uji KHM optimum diperoleh pada pengenceran ke-5 dengan nilai OD terendah 0,460. Uji KBM dari ekstrak black garlic pada pengenceran ke-5 menunjukkan koloni jamur C. albicans masih tumbuh, sehingga dapat dikatakan bahwa ekstrak black garlic hanya mampu menghambat pertumbuhan jamur namun tidak bisa membunuh jamur C. albicans. Kata kunci: antijamur; black garlic; maserasi  ABSTRACTActivity test of black garlic extract against the growth of the fungi Candida albicans. One plant that functions as an antifungal is garlic which is innovated into black garlic. The aim of this study is to indentify black garlic extract antifungal activity against of the Candida albicans. The method in this research was heated garlic for 35 days at temperature of 65°C. Black garlic was extracted by maceration method using methanol solvent. Antibacterial activity test based on inhibition zone test, minimal inhibitory concentration (MIC) and minimal kill concentration (MBC). Inhibition zone test with various extract concentrations of 100%, 90% and 80%. Concentrations with good inhibition zone values will be continued to the MIC and MBC tests with dilutions 1 to 5. The results showed that the inhibition zone of black garlic extract with a concentration of 100%, 3.15 mm. The optimum MIC test was obtained at the 5 dilution with the lowest OD value of absorbance 0.460. The MBC test of the black garlic extract at the 5 dilution showed C. albicans fungal colonies were still growing, so it can be said that the black garlic extract was only able to inhibit fungal growth but could not kill C. albicans fungi. Keywords: antifungal; black garlic; maceration

scholarly journals Antifungal activity of plant-based tinctures on Candida

RSBO ◽  
2013 ◽  
Vol 9 (1) ◽  
pp. 25-30
Author(s):  
Andreia Medeiros Rodrigues Cardoso ◽  
Yuri Wanderley Cavalcanti ◽  
Leopoldina de Fátima Dantas de Almeida ◽  
Ana Luíza Alves de Lima Pérez ◽  
Wilton Wilney Nascimento Padilha
Keyword(s):  
Candida Albicans ◽  
Statistical Analysis ◽  
Minimum Inhibitory Concentration ◽  
Antifungal Activity ◽  
Inhibitory Concentration ◽  
Fungal Growth ◽  
Initial Concentration ◽  
Malva Sylvestris ◽  
Fungal Inhibition

To evaluate through determination of minimum inhibitory concentration (MIC) the antifungal activity of Salvia officinalis (sage), Anacardium occidentale (cashew) and Malva sylvestris (mallow) tinctures on Candida albicans (ATCC 40227), C. tropicalis (ATCC 13803) and C. krusei (ATCC 40147). Material and methods: In 96-well microplates, 100 µl of Sabouraud-Dextrose broth doubly concentrated, 100 µl of the tested tinctures and 10 µl of fungal inoculums (1.5 x 106organisms/ml) were inserted. The products were diluted from initial concentration of 100 mg/ml until 0.78 mg/ml. MIC corresponded to the lowest dilution at which there was no visible fungal growth. Nystatin (100,000 UI/ml) was used as control. Statistical analysis was performed by Kruskal-Wallis and Dunn tests (p < 0.05). Results: S. officinalis tincture did not inhibit the growth of C. albicans and C. tropicalis; MIC was 100 mg/ml for C. krusei. For A. occidentale, MIC was 100 mg/ml for C. albicans and C. krusei, and for C. tropicalis, there was no fungal inhibition. M. sylvestris tincture presented MIC at 25 mg/ml for C. krusei and 100 mg/ml for C. albicans and C. tropicalis. The best antifungal activity was showed by M. sylvestris tincture (p < 0.05). Conclusion: M. sylvestris tincture exhibited antifungal activity against all the tested strains at lower concentrations. S. officinalis tincture inhibited the action of C. krusei and A. occidentale tincture showed activity against C. albicans and C. tropicalis.

Hidden “holes” in the capital of banks and the supply of credit to the real sector of economy

2018 ◽  
pp. 49-68 ◽  
Author(s):  
M. E. Mamonov
Keyword(s):  
Credit Risk ◽  
The Other ◽  
Real Sector ◽  
Capital Management ◽  
Loan Loss ◽  
Short Term ◽  
The Real ◽  
Ex Post ◽  
The One

Our analysis documents that the existence of hidden “holes” in the capital of not yet failed banks - while creating intertemporal pressure on the actual level of capital - leads to changing of maturity of loans supplied rather than to contracting of their volume. Long-term loans decrease, whereas short-term loans rise - and, what is most remarkably, by approximately the same amounts. Standardly, the higher the maturity of loans the higher the credit risk and, thus, the more loan loss reserves (LLP) banks are forced to create, increasing the pressure on capital. Banks that already hide “holes” in the capital, but have not yet faced with license withdrawal, must possess strong incentives to shorten the maturity of supplied loans. On the one hand, it raises the turnovers of LLP and facilitates the flexibility of capital management; on the other hand, it allows increasing the speed of shifting of attracted deposits to loans to related parties in domestic or foreign jurisdictions. This enlarges the potential size of ex post revealed “hole” in the capital and, therefore, allows us to assume that not every loan might be viewed as a good for the economy: excessive short-term and insufficient long-term loans can produce the source for future losses.

Phenolic Imidazole Derivatives with Dual Antioxidant/Antifungal Activity: Synthesis and Structure-Activity Relationship

2019 ◽  
Vol 15 (4) ◽  
pp. 341-351 ◽  
Author(s):  
Ana P. Bettencourt ◽  
Marián Castro ◽  
João P. Silva ◽  
Francisco Fernandes ◽  
Olga P. Coutinho ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antifungal Activity ◽  
Organic Molecules ◽  
Inhibitory Concentration ◽  
Yeast Species ◽  
Dpph Radical ◽  
Dpph Assay ◽  
Gram Negative ◽  
Structure Activity ◽  
Deoxyribose Degradation

Background: Previous publications show that the addition of a phenolic antioxidant to an antifungal agent, considerably enhances the antifungal activity. Objective: Synthesis of novel compounds combining phenolic units with linear or cyclic nitrogencontaining organic molecules with antioxidant/antifungal activity using methodologies previously developed in the group. Methods: Several N- [1,2-dicyano-2- (arylidenamino) vinyl]-O-alkylformamidoximes 3 were synthesized and cyclized to 4,5-dicyano-N- (N´-alcoxyformimidoyl)-2-arylimidazoles 4 upon reflux in DMF, in the presence of manganese dioxide or to 6-cyano-8-arylpurines 5 when the reagent was refluxed in acetonitrile with an excess of triethylamine. These compounds were tested for their antioxidant activity by cyclic voltammetry, DPPH radical (DPPH•) assay and deoxyribose degradation assay. The minimum inhibitory concentration (MIC) of all compounds was evaluated against two yeast species, Saccharomyces cerevisiae and Candida albicans, and against bacteria Bacillus subtilis (Gram-positive) and Escherichia coli (Gram negative). Their cytotoxicity was evaluated in fibroblasts. Results: Among the synthetised compounds, five presented higher antioxidant activity than reference antioxidant Trolox and from these compounds, four presented antifungal activity without toxic effects in fibroblasts and bacteria. Conclusion: Four novel compounds presented dual antioxidant/antifungal activity at concentrations that are not toxic to bacteria and fibroblasts. The active molecules can be used as an inspiration for further studies in this area.

Phytochemical Constituents of Tulbaghia violacea Harv Extract and its Antifungal Potential Against Cryptococcus neoformans and Cryptococcus gattii

2019 ◽  
Vol 9 (4) ◽  
pp. 330-340
Author(s):  
Mitradev Pattoo ◽  
Vuyokazi Belewa ◽  
Benesh Munilal Somai
Keyword(s):  
Antifungal Activity ◽  
Cryptococcus Neoformans ◽  
Antifungal Therapy ◽  
Developing World ◽  
Chemical Constituents ◽  
Cryptococcus Gattii ◽  
Plant Part ◽  
Aqueous Extracts ◽  
Antifungal Activities ◽  
Antifungal Potential

Background:In both the developed and developing world, the mortality rates of people afflicted with cryptococcosis are unacceptably high despite the availability of antifungal therapy. The disease is caused by Cryptococcus neoformans (predominantly in immunocompromised individuals) and by Cryptococcus gattii. Globally the disease is estimated to cause around 600,000 deaths annually. Antifungal therapy is available, but in the developing world, may be unaffordable to many people, there is an increasing threat of resistance to the available drugs and our repertoire of antifungal drugs is very limited. Consequently, more research has been focusing on the use of medicinal plants as therapeutic agents. The originality of the current study is that although Tulbaghia violacea is a well-documented medicinal plant, the chemical composition of aqueous extracts and their antifungal potential against pathogenic yeasts are unknown. This is the first study that evaluates the chemical constituents of aqueous T. violacea root, leaf, rhizome and tuber extracts and their corresponding antifungal activities against C. neoformans and C. gattii.Objectives:The study aimed to investigate the phytochemical composition and antifungal potential of Tulbaghia violacea root, leaf, rhizome and tuber extracts against Cryptococcus neoformans and Cryptococcus gattii.Methods:Roots, leaves, rhizomes and tubers were extracted with water only for 48 h at room temperature with continuous shaking. Extracts were filter sterilized, freeze-dried and, chemically analyzed for saponin, flavonol, phenolic and tannin content. Chemical constituents of each extract were also identified by GC-MS analysis. The Minimum Inhibitory Concentration (MIC) of suitably diluted extracts of each plant part were also performed against C. neoformans and C. gattii, yeast pathogens commonly associated with HIV/AIDS sufferers.Results:Phytochemical analysis showed different concentrations of saponins (between 1023 and 2896.73 µg/ml), phenolics (between 16.48 and 51.58 µg/ml) and tannins (between 122.30 and 543.07 µg/ml) present in the different extracts. No flavonols were detected. GC-MS analysis identified a complex mixture of phytochemicals composed predominantly of sulphide, pyran, furan and ketone containing compounds to be present in the different plant parts. All extracts were dominated by the presence of 4 H-pyran-4-one, 2,3-dihydro-3,5-dihydroxy-6-methyl, a pyran known to have antifungal properties. Although the root, leaf, rhizome and tuber extracts exhibited antifungal activities against both fungi, the rhizome and tuber extract were found to possess the lowest MIC’s of 1.25 mg/ml and 2.5 mg/ml against Cryptococcus neoformans and Cryptococcus gattii respectively.Conclusion:T. violacea extracts have a complex constituent of phytochemicals and each plant part exhibited a strong antifungal activity against C. neoformans and C. gattii. The rhizome and tuber extracts showed the highest antifungal activity against C. neoformans and C. gattii respectively. Thus, T. violacea aqueous extracts are strong candidates for further development into an antifungal chemotherapeutic agent.

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