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International Journal of Medicinal Mushrooms

Publicado 12 números por año

ISSN Imprimir: 1521-9437

ISSN En Línea: 1940-4344

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00066 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.34 SJR: 0.274 SNIP: 0.41 CiteScore™:: 2.8 H-Index: 37

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Production of Ligninolytic Enzymes by Oyster Mushroom Pleurotus ostreatus (Jacq.:Fr.) P. Kumm. Under Different Nutritional Conditions

Volumen 7, Edición 3, 2005, 433 pages
DOI: 10.1615/IntJMedMushrooms.v7.i3.730
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SINOPSIS

One of the effective methods for regulating and increasing the quantity of ligninolytic enzymes is the addition of the appropriate inducers to the nutrient medium. The ligninolytic enzymes of some white-rot fungi are synthesized only after the primary growth phase in response to nitrogen and carbon limitations in the medium. In the screening program, Pleurotus ostreatus appeared to be one of the best producers of extracellular laccase (Lac) and manganese peroxidase (MgP). Therefore, we compared the effect of different carbon and nitrogen sources, including lignocellulosic substrates, on P. ostreatus 98 oxidative enzyme production.
The secretion of Lac, MgP, and versatile peroxidase (VP) were significantly dependent on 11 types of carbon sources when species were grown in a medium with 2 g/L NH4NO3. Mandarin peels, which were used as one of the possible substrates, ensured very high yields of Lac (2375.5 U/L). Increasing its concentration in the nutrition medium from 20 g/L to 40 g/L resulted in a more than six-fold increase in Lac activity. Carboxylmethylcellulose, gluconic acid, glucose, and cellobiose (10 g/L) appeared to be poor growth substrates for Lac production. Moreover, results of this study showed that the activity of the enzyme was at its lowest level on medium containing avicel and mannitol.
Lignin degradation of P. ostreatus 98 on culture media with 10 g/L glucose and 11 types of nitrogen sources (0.5 g/L) was suppressed. This species showed high Lac activity in the presence of peptone, kazein acid, and corn step liquor (887.1 U/L, 802.3 U/L, and 674.3 U/L, respectively). In contrast, medium with NaNO3 NH4NO3, and (NH4)2SO4 inhibited this enzyme accumulation.
Secretion of VP and MnP by the investigated strain was comparatively low. Adding different carbon sources to the medium caused variation of VP activity from 0.24 U/L (medium with xylan) to 32.4 U/L (medium with mandarine peels). The results demonstrated that MnP activity was almost two-fold lower than VP activity on all of the used sources. The content of kazein acid and corn step liquor exerted the most favorable influence on the activity of VP and MnP. On the other hand, NH4NO3, NH4Cl, and (NH4)2SO4 were rather poor nitrogen sources for the production of these peroxidases.
In conclusion, it was shown that the synthesis of Lac, MnP, and VP by P. ostreatus 98 differed in various nutritional conditions. Among the different carbon and nitrogen sources, mandarine peels and peptone were optimal substrates for high production of the investigated enzymes.

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