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International Journal of Medicinal Mushrooms
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ISSN Imprimer: 1521-9437
ISSN En ligne: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.2018025816
pages 291-303

Bioavailability of Compounds Susceptible to Enzymatic Oxidation Enhances Growth of Shiitake Medicinal Mushroom (Lentinus edodes) in Solid-State Fermentation with Vineyard Prunings

Rosina Cabrera
CONACyT-Centro de Investigación en Alimentación y Desarrollo, AC, Hermosillo, Sonora CP, México
Damian López-Peña
Coordinación de Alimentos de Origen de Vegetal, Centro de Investigación en Alimentación y Desarrollo, AC, Hermosillo, Sonora CP, México
Ali Asaff
Coordinación de Ciencia de los Alimentos, Centro de Investigación en Alimentación y Desarrollo, AC, Hermosillo, Sonora CP, México
Martín Esqueda
Coordinación de Alimentos de Origen de Vegetal, Centro de Investigación en Alimentación y Desarrollo, AC, Hermosillo, Sonora CP, México
Elisa M. Valenzuela-Soto
Coordinación de Ciencia de los Alimentos, Centro de Investigación en Alimentación y Desarrollo, AC, Hermosillo, Sonora CP, México

RÉSUMÉ

Grapes are widely produced in northwestern Mexico, generating many wood trimmings (vineyard prunings) that have no further local use. This makes vineyard prunings a very attractive alternative for the cultivation of white-rot medicinal mushrooms such as Lentinus edodes. This type of wood can also offer a model for the evaluation of oxidative enzyme production during the fermentation process. We tested the effect of wood from vineyard prunings on the vegetative growth of and production of ligninolytic enzymes in L. edodes in solid-state fermentation and with wheat straw as the control substrate. The specific growth rate of the fungus was 2-fold higher on vineyard pruning culture (μM = 0.95 day-1) than on wheat straw culture (μM = 0.47 day-1). Laccase-specific production was 4 times higher in the vineyard prunings culture than on wheat straw (0.34 and 0.08 mU · mg protein-1 · ppm CO2-1, respectively), and manganese peroxidase production was 3.7 times higher on wheat straw culture than on vineyard prunings (2.21 and 0.60 mU · mg protein-1 · ppm CO2-1, respectively). To explain accurately these differences in growth and ligninolytic enzyme activity, methanol extracts were obtained from each substrate and characterized. Resveratrol and catechins were the main compounds identified in vineyard prunings, whereas epigallocatechin was the only one detected in wheat straw. Compounds susceptible to enzymatic oxidation are more bioavailable in vineyard prunings than in wheat straw, and thus the highest L. edodes growth rate is associated with the presence of these compounds.


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