Summary
A new culture technique was developed for studying the physiology of Pleurotus mycelium in solid state fermentation (SSF) system. This method consists of utilization sugar cane bagasse, a by-product of sugar industry, as solid support for absorbing a liquid culture medium. Compared with classical techniques, it offers the advantage of better control of liquid medium composition as well as culture conditions. Fermenters were coupled with on-line gas analysis by using a gas chromatograph equipped with thermal conductivity detector. Solid state culture were aerated at a very low flow air rate (0.04 ml/g moist solids). Concentrations of CO2 and O2 in the exhaust air from fermenters were continuously analysed. By means of this technique, culture conditions were optimized respect to the ratio urea/ammonium sulphate, the particle size of bagasse and inoculation rate. Under best conditions, nearly 90% of substrate was consumed in 6 days. This culture technique offers, excellent practicability for the development of mycelium inocula for commercial exploitation of Pleurotus spp.
Resume
Une nouvelle technique a été mise au point pour étudier la physiologie de croissance mycélienne de Pleurotus opuntiae cultivé en milieu solide. Cette méthode consiste à utiliser la bagasse de canne à sucre comme support solide pour y absorber une solution nutritive. Comparée à des techniques classiques, cette méthode offre des avantages pour un meilleur contrôle de la composition des solutions nutritives tout en respectant les conditions définies de fermentation en milieu solide. Les cultures en milieu solide ont été aérées avec un très faible débit d’air (0.04 mi/g de milieu humidifié). Les concentrations en CO2 et en O2 ont été analysées à partir des prélèments automatiques des effluents gazeux à la sortie des fermenteurs en utilisant un chromatographe de gaz équipé d’un détecteur à conductivité thermique. Par cette technique, les conditions de culture ont été optimisées en particulier le rapport urée/sulfate d’ammonium, la taille des particules du support et de l’inoculum. Sous ces conditions, environ 90% du substrat carboné a été consommé en 6 jours. Cette technique de culture offre des perspectives interessantes pour la production de mycélium de Pleurotes et peut être utilisée pour une exploitation commerciale.
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Roussos, S., Bresson, E., Saucedo-Castañeda, G., Martinez, P., Guinberteau, J., Olivier, J.M. (1997). Production of mycelial cell inoculum of Pleurotus opuntiae on natural support in solid state fermentation. In: Roussos, S., Lonsane, B.K., Raimbault, M., Viniegra-Gonzalez, G. (eds) Advances in Solid State Fermentation. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0661-2_40
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DOI: https://doi.org/10.1007/978-94-017-0661-2_40
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