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Revista mexicana de ingeniería química
versión impresa ISSN 1665-2738
Resumen
ORTEGA-SANCHEZ, E.; LOERA, O. y VINIEGRA-GONZALEZ, G.. The effect of the ratio between substrate concentration and specific area of the support on the biomass yield of fungal surface cultures. Rev. Mex. Ing. Quím [online]. 2012, vol.11, n.3, pp.485-494. ISSN 1665-2738.
A parameter, σ0 = S0α-1 (gcm2), is defined. Where, S0, (gcm-3) is the initial substrate concentration and α is the specific area of the solid support. This parameter helps comparing the biomass yields, YX/S, of fungical superficial cultures either with a fixed S0 value and variable α or with fixed α and variable S0. A. niger cultures followed the logistic equation with maximal surface density ρAM (gcm-2). Final average thickness, h, was measured by image analysis. The values of h, followed a saturation function of σ0(R2 = 0.965) with extrapolated value hMAX ≈ 0.4 cm. But the volumetric density ρV =ρAMh-1 was nearly constantρV≈ 0.046 ± 0.005 (gcm-3). The regression = Y0-1 + σ0ε-1 (R2 = 0.95) in the range, 5.9 mgcm-2 < (σ0 < 62.8 mgcm-2 indicated, Y0 = 0.5, as the maximal biomass yield, and ε = ρVhMAX ≈ 0.02 gcm-2, as a measurement of the biosynthetic efficiency. This approach could be useful for the normalization end comparison of screening tests of fungal surface cultures with a variety of solid supports and culture conditions. For example, cultures with different S0 values but, similar yield coefficient YX/S.
Palabras llave : fungal surface cultures; mass balance; specific area; biomass yield; Aspergillus niger.