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1.
Adv Biochem Eng Biotechnol ; 184: 29-76, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-35364694

RESUMO

Since most of the medicinal mushrooms are rare in nature, production of fungal fruiting bodies is hardly covering the food market and the production of pharmaceutically active products, so artificial cultivation of fruiting bodies in a form of farming has been intensively established during the last 40 years. Various cultivation technologies are presented, including traditional farming of fruiting bodies on wood logs and beds, and also on other substrate-based media, such as cultivation in bags, bottles, and others. The advantage of farming is a cheap but time-consuming large-scale production. Agriculture, wood, and food industry wastes represent the main substrates that are in this process delignified and enriched in proteins and highly valuable pharmaceutically active compounds. The present article presents an overview of achievements in artificial cultivation of fruiting bodies, including the most relevant medicinal mushroom species, such as Ganoderma lucidum, Grifola frondosa, Pleurotus ostreatus, Agaricus brasiliensis, and Lentinula edodes.


Assuntos
Carpóforos , Pleurotus , Agricultura , Carpóforos/química , Carpóforos/metabolismo , Resíduos Industriais/análise , Pleurotus/química , Pleurotus/metabolismo , Madeira
2.
Food Technol Biotechnol ; 60(1): 67-79, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35440876

RESUMO

Research background: In the recent years, considerable attention has been given to selenium status since its deficiency is linked with various disorders and affects at least 13% of world population. Additionally, mushrooms are known to possess pronounced capacity for absorption of various micronutrients, including Se, from soil/substrate. Here, we investigate the possibility of using Se-rich zeolitic tuff as a supplement for production of selenized mushroom. Furthermore, the impact of the enrichment on the activity of antioxidant enzymes and biological potential of Coriolus versicolor medicinal mushroom is studied. Experimental approach: Se(IV)- and Se(VI)-modified natural zeolitic tuff from the Serbian deposit Zlatokop was used as supplement for mushroom cultivation. To examine the effectiveness of selenium enrichment, we determined total selenium with inductively coupled plasma mass spectrometry (ICP-MS), together with the activity of antioxidant enzymes in fresh fruiting bodies and biological potential of methanolic extracts. Antioxidant activity was evaluated using the appropriate tests for: inhibition of lipid peroxidation, DPPH free radical scavenging assay, Fe(III)-reducing antioxidant power assay and ability of chelating Fe2+ ions. The antibacterial activity against foodborne pathogens was measured by broth microdilution assay. Additionally, chemical composition of the prepared extracts was studied using UV-Vis and Fourier transform infrared (FTIR) spectroscopy. Results and conclusions: Content of selenium detected in biofortified C. versicolor was even 470 times higher than in control on dry mass basis ((140.7±3.8) vs (0.3±0.1) µg/g), proving that Se-rich zeolitic tuff is an excellent supplement for mushroom production. Furthermore, the results of monitoring the activity of antioxidant enzymes revealed that most of the Se-enriched mushrooms exhibited higher superoxide dismutase (SOD) and catalase (CAT) and lower glutathione peroxidase (GSH-Px) activities than control. Due to higher amounts of enzymes, which can quickly catalyze the reduction of superoxide radicals, the quality of selenium-enriched mushrooms is preserved for a longer period of time. Investigation of biological potential indicated that Se-enriched mushroom methanolic extracts, generally, expressed enhanced antioxidant properties. Additionally, extracts showed antibacterial activity against all tested pathogenic microorganisms. Novelty and scientific contribution: Cultivation of mushrooms on Se-enriched zeolitic tuff is a new technological approach for obtaining Se-fortified food/supplements with enhanced antioxidant and antibacterial activities.

3.
Food Chem ; 342: 128344, 2021 Apr 16.
Artigo em Inglês | MEDLINE | ID: mdl-33268175

RESUMO

Medicinal mushrooms, Coriolus versicolor and Lentinus edodes are extremely attractive as nutraceuticals. Here we used fruiting bodies to prepare novel kombucha beverage. Microbiological, physicochemical and chemical properties were monitored for eleven days, while the immunological properties of kombucha polysaccharide extracts were determined in peripheral blood mononuclear cell (PBMC) cultures. FTIR analysis of polysaccharide extracts showed dominant presence of polysaccharides, in addition to phenols, lipids and proteins. C. versicolor kombucha extract displayed more complex polysaccharides, and a higher content of total polysaccharides, phenols and flavonoids compared to L. edodes kombucha extract. The extracts were not cytotoxic for PBMC in vitro up to 500 µg/ml, while immunomodulatory effects depended on their chemical compositions. The most prominent effect was on the reduction of Th2 cytokines and IL-10 in PBMC cultures. Based on these results, novel kombucha products could be recommended as functional beverages or nutraceuticals with potentially beneficial immunomodulatory effects in allergies.


Assuntos
Bebidas/microbiologia , Fermentação , Polissacarídeos Fúngicos/imunologia , Fatores Imunológicos/farmacologia , Polyporaceae/química , Polyporaceae/metabolismo , Polissacarídeos Fúngicos/química , Fatores Imunológicos/química , Leucócitos Mononucleares/efeitos dos fármacos , Leucócitos Mononucleares/imunologia
4.
J Basic Microbiol ; 60(4): 331-340, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32003038

RESUMO

The ability of Coriolus versicolor medicinal mushroom to grow and accumulate selenium during submerged cultivation in a selenium-fortified medium is examined in this paper. For selenium supplementation, commercial selenium yeast was used. Control, nonenriched sample and reference cultures cultivated in the medium enriched with commercial yeast Saccharomyces cerevisiae were also prepared. The mushroom demonstrated a high ability to accumulate selenium from the added source (around 970 and 1,300 µg/g of dry mycelium weight for samples enriched with selenium in a concentration of 10 and 20 mg Se/L, respectively). The addition of selenium significantly (p ≤ .05) increased the biomass yield, whereas the addition of nonenriched yeast had no significant (p ≤ .05) impact. Furthermore, regression analysis showed statistically significant (p ≤ .05) and positive correlations between the content of Se and Fe (r = .92), Se and Cu (r = .92), Se and Mn (r = .98), and Se and Sr (r = .96), suggesting that selenium incorporation was followed by incorporation of these elements, and led to mineral enrichment of the obtained mycelium. Methanol extracts prepared from mycelium biomass demonstrated a better inhibitory effect on Gram-positive bacterial strains with minimal inhibitory concentrations between <0.3125 and 40 mg/ml. The obtained results showed that selenium yeast could be used for obtaining a potential novel food supplement: mushroom biomass with high selenium content and enhanced mineral composition.


Assuntos
Agaricales/efeitos dos fármacos , Agaricales/crescimento & desenvolvimento , Biomassa , Selênio/farmacologia , Agaricales/química , Meios de Cultura , Suplementos Nutricionais/análise , Bactérias Gram-Positivas , Metanol/química , Micélio/química , Micélio/efeitos dos fármacos , Saccharomyces cerevisiae , Selênio/metabolismo
5.
Int J Med Mushrooms ; 22(9): 885-895, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33389854

RESUMO

Crude Trametes versicolor exopolysaccharides (cEPS) were used for antioxidative activity testing. Obtained results revealed high ability of cEPS for DPPH free radical scavenging and high chelating ability at the highest tested concentration (20 mg/mL), while the reducing power was significantly lower. However, based on the EC50 values, antioxidative activities of the cEPS decreased in the following order: reducing power > DPPH scavenging ability > chelating ability. Due to the high carbohydrate and ß-glucan content it is assumed that they are the main carriers of cEPS antioxidative activities. D-glucose was the main monosaccharide (87.18 ± 0.27%) while the dominant amino acids were L-lysine (L-glutamic and L-aspartic acid), which are amino acids with taste similar to the monosodium glutamate. In addition, content of sweet tasting amino acids compared with the group of bitter tasting amino acid was 2.1 times higher, indicating favorable composition of cEPS protein fraction for food industry applying.


Assuntos
Agaricales/química , Antioxidantes/química , Polissacarídeos Fúngicos/química , Extratos Vegetais/química , Polyporaceae/química
6.
Food Technol Biotechnol ; 57(3): 408-417, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31866754

RESUMO

The multicomponent mixtures consisting of herbs and fungi are commonly used for the production of alcoholic beverages with potential health-promoting effects in many Asian countries. The medicinal fungus Ganoderma lucidum is one of the most important fungi used for spirit production. Although this fungus affects the aromatic complexity of spirits, only a small number of studies have focused on investigating the influence of G. lucidum on the aromatic profile and colour of spirits. The aim of the research is to evaluate the influence of adding G. lucidum and herbal extract on final concentrations of volatile compounds and sensory quality of several distillates. In this study, distillates (grain, plum, grape and wine) were used to produce new spirit-based beverages with the fungus G. lucidum only, or with the fungus and herbal extract. Fifty-nine aroma compounds were identified by GC-MS. The aromatic profiles were strongly influenced by the primary aromas of the distillates, but the addition of G. lucidum and herbal extract enriched the volatile fraction of distillates with a range of ethyl esters, with a fruity and floral fragrance. Higher alcohols, 1-propanol, 2-isobutanol and isoamyl alcohol, were the most abundant volatile compounds in the analyzed distillates and spirits. The lightness of distillates was from 60.7 to 63.6, and with the addition of Ganoderma it significantly decreased to the range from 43.6 to 50.5. The addition of the fungus also increased the intensity of red and yellow colours. The Ganoderma spirits scored very highly in sensory evaluation (17.6-18.3), significantly better than the spirits without any additions (16.1-16.9).

7.
Food Technol Biotechnol ; 57(2): 282-289, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31537977

RESUMO

The study assessed the antimicrobial and antioxidant activities of commonly used and commercially available essential oils as an alternative to synthetic preservatives. The plant sources were as follows: lavender (Lavandula angustifolia), tea tree (Melaleuca alternifolia), bergamot (Citrus bergamia) and peppermint (Mentha piperita). The antioxidant activity of essential oils was tested by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2´-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) methods. The microdilution broth susceptibility assay revealed that lavender and bergamot essential oils were more efficient in inhibiting the bacterial growth than other tested oils, with the minimum inhibitory concentration of 5 µg/mL. This study also reports the successful implementation of an electrostatic extrusion technique for encapsulating essential oils into alginate beads, which enables the essential oils to maintain their free radical scavenging ability over time.

8.
J Sci Food Agric ; 99(11): 5122-5130, 2019 Aug 30.
Artigo em Inglês | MEDLINE | ID: mdl-30993725

RESUMO

BACKGROUND: The ability of Coriolus versicolor medicinal mushroom to accumulate and transform selenium from selenourea and sodium selenite into an organic form - l-selenomethionine - during growth in liquid medium is examined in this paper. Additionally, the impact of supplementation on biological activity of the selenated mushroom methanol extracts, as well as their chemical composition, is studied. RESULTS: Selenium accumulation was more efficient with sodium selenite application, but biomass yield was significantly lower (1.89 g DW L-1 ) compared to samples enriched with selenourea (4.48 g DW L-1 ). Mushroom sample obtained after growing in liquid medium with selenourea had significantly higher l-selenomethionine content compared to the sample grown in medium with sodium selenite. Selenium-enriched methanol extracts of C. versicolor mushroom showed improved antimicrobial and antioxidant activities compared to non-enriched extract. CONCLUSION: Our results suggest that C. versicolor mushroom cultivated in liquid culture enriched with selenourea can be used for the production of novel food supplements with improved selenium bioavailability. More than 30% of total accumulated selenium from selenourea is transformed into l-selenomethionine. Differences in biological activity of methanol extracts can be explained not only by different selenium content but also by the differences in chemical composition of extracts. © 2019 Society of Chemical Industry.


Assuntos
Agaricales/crescimento & desenvolvimento , Agaricales/metabolismo , Selênio/metabolismo , Agaricales/química , Disponibilidade Biológica , Meios de Cultura/química , Meios de Cultura/metabolismo , Suplementos Nutricionais/análise , Compostos Organosselênicos/análise , Compostos Organosselênicos/metabolismo , Selênio/análise , Selenometionina/análise , Selenometionina/metabolismo , Ureia/análogos & derivados , Ureia/análise , Ureia/metabolismo
9.
Int J Med Mushrooms ; 20(3): 243-258, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29717669

RESUMO

Kombucha is a nonalcoholic beverage traditionally made by fermenting black tea using a combination of yeast and acetic acid bacteria (AAB) cultures. Ganoderma lucidum hot water extract (HWE) was used-to our knowledge for the first time-to prepare a novel, health-promoting kombucha product. During the 11-day fermentation, pH, total acidity, and the numbers of yeasts and AAB were monitored. It was found that sweetened G. lucidum HWE was a good medium for yeast and AAB growth. The desired acidity for the beverage was reached on the second day (3 g/L) of the fermentation process; the maximum established acidity was 22.8 ± 0.42 g/L. Fourier transform infrared analysis revealed that the vacuum-dried beverage is a mixture of various compounds such as polysaccharides, phenols, proteins, and lipids. Total phenolic content of the liquid sample was 4.91 ± 0.2338 mg gallic acid equivalents/g, whereas the vacuum-dried sample had a smaller amount of phenolics (2.107 ± 0.228 mg gallic acid equivalents/g). Established half-maximal effective concentrations for DPPH scavenging activity and reducing power were 22.8 ± 0.17 and 10.61 ± 0.34 mg/mL, respectively. The antibacterial testing revealed that activity does not originate solely from synthesized acetic acid. The liquid G. lucidum beverage was the most effective against the tested bacteria, with the lowest minimum inhibitory concentration (0.04 mg/mL) against Staphylococcus epidermidis and Rhodococcus equi, and a minimum bactericidal concentration (0.16 mg/mL) against Bacillus spizizenii, B. cereus, and R. equi. The vacuum-dried sample was less effective, with the lowest minimum bactericidal concentration against the Gram-positive bacteria R. equi (1.875 mg/mL) and against the Gram-negative bacteria Proteus hauseri (30 mg/mL).


Assuntos
Antibacterianos/metabolismo , Antioxidantes/metabolismo , Bebidas/análise , Misturas Complexas/metabolismo , Reishi/química , Chá/metabolismo , Leveduras/metabolismo , Antibacterianos/farmacologia , Antioxidantes/farmacologia , Misturas Complexas/isolamento & purificação , Fermentação , Bactérias Gram-Negativas/efeitos dos fármacos , Bactérias Gram-Positivas/efeitos dos fármacos , Concentração de Íons de Hidrogênio , Testes de Sensibilidade Microbiana , Espectroscopia de Infravermelho com Transformada de Fourier
10.
Environ Sci Pollut Res Int ; 24(25): 20273-20281, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28702914

RESUMO

Two types of zeolites-natural clinoptilolite (NZ) and synthetic zeolite A (A)-were enriched with approx. 0.25 mmol of Cu(II), Zn(II), or Ag(I) ions, and the obtained materials (M-Z) were tested against three different isolates of Escherichia coli. Two isolates were environmental isolates from waters in Serbia whereas the third one was DSM 498. Antibacterial activity was studied in different water media-nutrient-rich media (peptone water), water from Sava Lake, and commercially available spring water. The Ag-containing zeolites showed bactericidal activity in the nutrient-rich peptone water after 1 h of contact. Cu- and Zn-containing zeolites showed bactericidal activity in real water samples. Antibacterial activity of the M-Z decreases in all three examined water media in the following order: Ag-NZ ≈ Ag-A > Cu-NZ ≈ Cu-A > Zn-NZ >>> Zn-A, suggesting that mainly the metal type and not the zeolite type have a role in the antibacterial activity. Leaching experiments showed small amounts of the leached Cu(II) and Zn(II) ions, indicating that the antibacterial activity is not due to the metal ions but should be attributed to the M-Z itself. However, leached amounts of Ag(I) from Ag-NZ and Ag-A in peptone water indicate that the released Ag(I) could be mainly responsible for the bactericidal effect of the Ag(I)-containing zeolites. Since no loss of cellular material was found, the antibacterial activity is not attributed to cytoplasmic membrane damage.


Assuntos
Antibacterianos/farmacologia , Escherichia coli/efeitos dos fármacos , Metais Pesados/farmacologia , Zeolitas/farmacologia , Antibacterianos/química , Cobre/química , Cobre/farmacologia , Escherichia coli/isolamento & purificação , Metais Pesados/química , Sérvia , Prata/química , Prata/farmacologia , Zeolitas/síntese química , Zeolitas/química , Zeolitas/isolamento & purificação , Zinco/química , Zinco/farmacologia
11.
J Colloid Interface Sci ; 500: 30-43, 2017 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-28395161

RESUMO

Electrochemically exfoliated graphene is functionalized graphene with potential application in biomedicine. Two most relevant biological features of this material are its electrical conductivity and excellent water dispersibility. In this study we have tried to establish the correlation between graphene structure and its antibacterial properties. The exfoliation process was performed in a two electrode-highly oriented pyrolytic graphite electrochemical cell. Solution of ammonium persulfate was used as an electrolyte. Exfoliated graphene sheets were dispersed in aqueous media and characterized by atomic force microscopy, scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, X photoelectron spectroscopy, X-ray diffraction, electron paramagnetic resonance, zeta potential, contact angle measurements and surface energy. Antibacterial assays have shown lack of the significant antibacterial activity. Major effect on bacteria was slight change of bacteria morphology. Membrane remained intact despite significant change of chemical content of membrane components.

12.
J Food Sci Technol ; 54(5): 1312-1320, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28416882

RESUMO

The content of phenolic compounds (TPC) and glucans, as well as the effectiveness of antiproliferative and antioxidant activity of differently processed Ganoderma lucidum ethanol extracts were determined and compared. The content of glucans (total, α- and ß-) strongly depended on the extraction time and particle size, but only interaction of these parameters influenced the TPC. Gallic acid, quercetin, trans-cinnamic acid, kaempferol, hesperetin and naringenin were detected in extracts by HPLC-DAD. The most abundant phenols were hesperetin (1.875-3.222 µg/g) and naringenin (1.235-2.856 µg/g). The ethanol extracts exhibited noteworthy antioxidant activity, but the significant amount of phenolic compounds was strongly linked to polysaccharides, and hence reduced their antioxidant capacity. The results of the antiproliferative activity in vitro showed that the analyzed extracts were the most effective against HeLa cells. Significant correlations were observed between the antiproliferative effect and the TPC/glucan content of extracts.

13.
J Sci Food Agric ; 97(9): 3013-3021, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-27859282

RESUMO

BACKGROUND: The aim of this study was to develop a total quality index and examine the effects of modified atmosphere packaging (MAP) on the quality of Agaricus bisporus mushrooms stored for 22 days at 4 °C. Mushrooms were packaged under three MAPs: high nitrogen packaging (HNP), low carbon dioxide packaging (LCP) and low oxygen packaging (LOP). Passive MAP with air inside initially was used as the atmosphere treatment (AIR). RESULTS: This research revealed two phases in quality deterioration of A. bisporus mushrooms. During the first week, most of the quality parameters were not statistically different. Thereafter, odor intensities were stronger for all four types of packaging. Color difference and browning index values showed significantly lower color changes for AIR and LOP compared with HNP and LCP mushrooms. CONCLUSION: The best total quality index was calculated for LOP, followed by LCP and AIR. The findings of this study are useful with respect to examining two-component MAPs, separating the limiting factors (O2 and CO2 ) and evaluating quality deterioration effects and the total quality index of A. bisporus mushrooms. © 2016 Society of Chemical Industry.


Assuntos
Agaricus/química , Embalagem de Alimentos/métodos , Verduras/química , Embalagem de Alimentos/instrumentação , Oxigênio/análise , Controle de Qualidade , Temperatura
14.
Int J Med Mushrooms ; 18(9): 781-792, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27910770

RESUMO

Kaolinite and the modified natural zeolite minazel plus (M+) were used as supplements in substrate used for the production of the medicinal mushroom Grifola frondosa. Growth stimulation, expressed as yield and biological efficiency, was observed when M+ (1%) was added. The production cycle was shortened by half as a result of the zeolites' ion-exchange ability, stimulation of enzyme activity, and water retain capacity. Inductively coupled plasma optical emission spectrometry of fruiting bodies showed the absence of heavy metals (arsenic, cadmium, and lead), whereas the concentration of calcium increased greatly and the concentrations of iron, magnesium, and zinc increased moderately under the influence of M+. Solid-state nuclear magnetic resonance showed a positive impact on the ß-glucan ratio, which could have been caused by the epimerization reaction stimulated by zeolites. The functionality of the mushroom was evaluated through several antioxidant activity assays, and in all cases a positive effect was established: M+ was statistically more effective in comparison with kaolinite. A strong correlation was established between the antioxidative activity of cultivated fruiting bodies and the tested compounds (total phenolic compounds, carbohydrates, and minerals).


Assuntos
Carpóforos/fisiologia , Grifola/fisiologia , Zeolitas , Antioxidantes/química , Antioxidantes/farmacologia , Compostos de Bifenilo , Carboidratos , Meios de Cultura , Espectroscopia de Ressonância Magnética , Picratos , Polissacarídeos/química , Polissacarídeos/metabolismo , Esporos Fúngicos
15.
Jundishapur J Microbiol ; 9(9): e34804, 2016 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-27800143

RESUMO

BACKGROUND: The highest incidence of listeriosis, due to consumption of ready-to-eat foods and fresh, shredded, minimally processed vegetables, occurs among pregnant women and the elderly. In order to reduce the prevalence of listeriosis among consumers, better protective measures are recommended. Chitosan films, with or without added essential oils, represent a modern, safe method of preserving the quality of such vegetables and significantly reducing the incidence of Listeria monocytogenes in these foods. OBJECTIVES: The present study was conducted to evaluate the antimicrobial properties of composite chitosan-gelatin films with and without essential oils against two strains of L. monocytogenes, ATCC 19115 and ATCC 19112, in fresh shredded cabbage. METHODS: Shredded cabbage was inoculated with L. monocytogenes and packed between two layers of the chitosan composite film, then placed in Petri dishes. The prepared samples were stored at 4°C then analyzed for total viable count on PALCAM agar while incubated at 37°C, every 24 hours for 7 days. RESULTS: Average L. monocytogenes content ranged from 4.2 - 5.4 log CFU/g, reaching values of 7.2 - 8.6 log CFU/g in samples of untreated cabbage. A complete reduction of L. monocytogenes ATCC 19115 on cabbage was achieved after 120 hours in the presence of 0.5% chitosan film, whereas reduction of L. monocytogenes ATCC 19112 was achieved after 144 hours. In the presence of 1% chitosan film, the bacteria withered more quickly and complete reduction of both species of L. monocytogenes was achieved after 96 hours. CONCLUSIONS: All tested formulations of chitosan films exhibited strong antimicrobial activity on the growth of both strains of L. monocytogenes on cabbage. The best effect was achieved with a 1% chitosan concentration. The addition of essential oils increased the antimicrobial activity of all tested films.

16.
Int J Med Mushrooms ; 18(4): 279-89, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27481294

RESUMO

The objective of this research was to test whether selenium-yeast (Se-yeast) is a better source of selenium than sodium selenite for accumulation in mycelia and immunoactive cell wall polysaccharides. Culture media were enriched in selenium to a concentration of 20 µg/mL. Selenium was added to the medium either in the form of sodium selenite or in form of Se-yeast (Sel-Plex; Alltech Inc., Lexington, KY). The total selenium concentrations in the mycelium biomass and in the isolated crude polysaccharides were determined using atomic absorption spectroscopy. We found that selenium accumulated more efficiently in cultures enriched with Se-yeast. A higher concentration of selenium was also found in the crude polysaccharide fractions isolated from the mycelium grown in Se-yeast-enriched media. With the use of the needle trap gas chromatography-mass spectrometry method, we found that there are significant differences in the composition of the volatile aroma and flavor compounds secreted by the mycelia cultivated in different media.


Assuntos
Micélio/química , Polissacarídeos/química , Selênio/isolamento & purificação , Cogumelos Shiitake/química , Selenito de Sódio/metabolismo , Parede Celular/química , Meios de Cultura , Cromatografia Gasosa-Espectrometria de Massas , Micélio/metabolismo , Selênio/metabolismo , Cogumelos Shiitake/metabolismo , Espectrofotometria Atômica
17.
Front Microbiol ; 7: 1226, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27540376

RESUMO

The antibacterial activity of methanol extract obtained from fruiting body of industrially grown basidiomycete Coriolus versicolor was examined. The Minimum Inhibitory Concentration (MIC) values against various bacteria ranged from 0.625 to 20 mg mL(-1). C. versicolor expressed bactericidal activity against both Gram-positive and Gram-negative bacteria. The growth curves of Staphylococcus aureus and Salmonella enterica serovar Enteritidis, measured at 630 nm, and confirmed with macrodilution method showed that the obtained extract could inhibit the growth of tested bacteria. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the loss of 260-nm-absorbing material were used to examine the ultrastructural changes in bacteria induced by the extract. When S. aureus was exposed to the MIC of C. versicolor, elongated and malformed cells were observed by SEM, while S. Enteritidis treated cells appeared shorter and aggregated with ruptured cell walls. TEM revealed the formation of non-membrane-enclosed bodies and depleted inner content of S. aureus. Larger and irregular periplasmic space and deformed and scattered components of the cell envelope were observed in treated S. Enteritidis. The loss of 260-nm-absorbing material indicated that the disruptive action of the extract on cytoplasmic membrane was more pronounced in S. aureus than in S. Enteritidis treated cells. The UV and FTIR spectrophotometric analyses revealed diverse composition of C. versicolor extract and high content of total phenolics. Altogether, mushroom extracts could be used to develop nutraceuticals or drugs effective against pathogenic microorganisms.

18.
Rev Argent Microbiol ; 48(2): 128-36, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27237426

RESUMO

The antibacterial activity of chitosan coatings prepared with acetic or lactic acid, as well as of composite chitosan-gelatin films prepared with essential oils, was evaluated in fresh shredded black radish samples inoculated with Listeria monocytogenes ATCC 19115 and L. monocytogenes ATCC 19112 during seven days of storage at 4°C. The chitosan coating prepared with acetic acid showed the most effective antibacterial activity. All tested formulations of chitosan films exhibited strong antimicrobial activity on the growth of L. monocytogenes on black radish, although a higher inhibition of pathogens was achieved at higher concentrations of chitosan. The antimicrobial effect of chitosan films was even more pronounced with the addition of essential oils. Chitosan-gelatin films with thyme essential oils showed the most effective antimicrobial activity. A reduction of 2.4log10CFU/g for L. monocytogenes ATCC 19115 and 2.1log10CFU/g for L. monocytogenes ATCC 19112 was achieved in the presence of 1% chitosan film containing 0.2% of thyme essential oil after 24h of storage.


Assuntos
Quitosana/farmacologia , Microbiologia de Alimentos , Conservação de Alimentos/métodos , Conservantes de Alimentos/farmacologia , Listeria monocytogenes/efeitos dos fármacos , Óleos Voláteis/farmacologia , Raphanus/microbiologia , Thymus (Planta)/química , Ácido Acético/farmacologia , Carga Bacteriana , Manipulação de Alimentos , Qualidade dos Alimentos , Armazenamento de Alimentos , Gelatina , Humanos , Ácido Láctico/farmacologia , Sensação , Solventes/farmacologia
19.
Molecules ; 20(10): 19489-525, 2015 Oct 27.
Artigo em Inglês | MEDLINE | ID: mdl-26516828

RESUMO

Oxidative stress caused by an imbalanced metabolism and an excess of reactive oxygen species (ROS) lead to a range of health disorders in humans. Our endogenous antioxidant defense mechanisms and our dietary intake of antioxidants potentially regulate our oxidative homeostasis. Numerous synthetic antioxidants can effectively improve defense mechanisms, but because of their adverse toxic effects under certain conditions, preference is given to natural compounds. Consequently, the requirements for natural, alternative sources of antioxidant foods identified in edible mushrooms, as well as the mechanistic action involved in their antioxidant properties, have increased rapidly. Chemical composition and antioxidant potential of mushrooms have been intensively studied. Edible mushrooms might be used directly in enhancement of antioxidant defenses through dietary supplementation to reduce the level of oxidative stress. Wild or cultivated, they have been related to significant antioxidant properties due to their bioactive compounds, such as polyphenols, polysaccharides, vitamins, carotenoids and minerals. Antioxidant and health benefits, observed in edible mushrooms, seem an additional reason for their traditional use as a popular delicacy food. This review discusses the consumption of edible mushrooms as a powerful instrument in maintaining health, longevity and life quality.


Assuntos
Agaricales/química , Antioxidantes/química , Extratos Vegetais/farmacologia , Verduras/química , Antioxidantes/farmacologia , Suplementos Nutricionais/análise , Humanos , Longevidade/efeitos dos fármacos , Extratos Vegetais/química , Qualidade de Vida
20.
Food Funct ; 6(6): 1875-86, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25943486

RESUMO

The methanolic extract of the wild edible mushroom Cantharellus cibarius Fr. (chanterelle) was analyzed for in vitro antioxidative, cytotoxic, antihypertensive and antibacterial activities. Various primary and secondary metabolites were found. Phenols were the major antioxidant components found in the extract (49.8 mg g(-1)), followed by flavonoids, whose content was approximately 86% of the total phenol content. Antioxidant activity, measured by four different methods, was high for inhibition of lipid peroxidation (EC50 = 1.21 mg mL(-1)) and chelating ability (EC50 = 0.64 mg mL(-1)). The antioxidant activity of the C. cibarius methanol extract was achieved through chelating iron compared to hydrogen atom and/or electron transfer. The extract showed good selectivity in cytotoxicity on human cervix adenocarcinoma HeLa, breast carcinoma MDA-MB-453 and human myelogenous leukemia K562, compared to normal control human fetal lung fibroblasts MRC-5 and human lung bronchial epithelial cells BEAS-2B. The extract had inhibitory activity against angiotensin converting I enzyme (ACE) (IC50 = 0.063 mg mL(-1)). The extract revealed selective antimicrobial activity against Gram-positive bacteria with the highest potential against E. faecalis. The medicinal and health benefits, observed in wild C. cibarius mushroom, seem an additional reason for its traditional use as a popular delicacy food.


Assuntos
Inibidores da Enzima Conversora de Angiotensina/química , Antineoplásicos/química , Antioxidantes/química , Basidiomycota/química , Produtos Biológicos/química , Suplementos Nutricionais , Compostos Fitoquímicos/química , Inibidores da Enzima Conversora de Angiotensina/efeitos adversos , Inibidores da Enzima Conversora de Angiotensina/isolamento & purificação , Inibidores da Enzima Conversora de Angiotensina/metabolismo , Antibacterianos/efeitos adversos , Antibacterianos/química , Antibacterianos/isolamento & purificação , Antibacterianos/metabolismo , Antineoplásicos/efeitos adversos , Antineoplásicos/isolamento & purificação , Antineoplásicos/metabolismo , Antioxidantes/efeitos adversos , Antioxidantes/isolamento & purificação , Antioxidantes/metabolismo , Basidiomycota/crescimento & desenvolvimento , Basidiomycota/metabolismo , Produtos Biológicos/efeitos adversos , Produtos Biológicos/isolamento & purificação , Produtos Biológicos/metabolismo , Linhagem Celular , Linhagem Celular Tumoral , Sobrevivência Celular , Suplementos Nutricionais/efeitos adversos , Suplementos Nutricionais/análise , Enterococcus faecalis/crescimento & desenvolvimento , Enterococcus faecalis/metabolismo , Flavonoides/efeitos adversos , Flavonoides/análise , Flavonoides/química , Flavonoides/metabolismo , Florestas , Carpóforos/química , Carpóforos/crescimento & desenvolvimento , Carpóforos/metabolismo , Humanos , Quelantes de Ferro/efeitos adversos , Quelantes de Ferro/química , Quelantes de Ferro/isolamento & purificação , Quelantes de Ferro/metabolismo , Peroxidação de Lipídeos , Metanol/química , Montenegro , Fenóis/efeitos adversos , Fenóis/análise , Fenóis/química , Fenóis/metabolismo , Compostos Fitoquímicos/efeitos adversos , Compostos Fitoquímicos/análise , Compostos Fitoquímicos/biossíntese , Solventes/química
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