Effect of dissolved oxygen concentration on red pigment and citrinin production by Monascus purpureus ATCC 36928

Brazilian Journal of Chemical Engineering

D. G. Pereira¹  A. Tonso¹  B. V. Kilikian¹ 

[1] ,Universidade de São Paulo Escola Politécnica Departamento de Engenharia QuímicaSão Paulo SP ,Brazil

关键词: Agitation speed;    Citrinin;    Dissolved oxygen;    Monascus;    Red pigments;   

DOI  :  10.1590/S0104-66322008000200004

来源: SciELO

【 摘 要 】

The present study investigated the effects of agitation speed, N (200, 500, 600 or 700 rpm), and dissolved oxygen concentration, C (120, >70, 70, 60, 10 or < 10%), on red pigment and citrinin production by Monascus purpureus ATCC 36928, cultivated in liquid medium by a batch process. The gas flow rate was the same for all runs with C controlled by means of the incoming gas composition control (air/N2 or air/O2). From the response surface plots it can be verified that the effect of C was greater than that of N on the production of both metabolites. The absorbance for red pigments varied from 1.6 U (C< 10%; N=200 rpm) up to 3.3 U (C=60%; N=600 rpm), an increase of 106%, while citrinin concentration increased 257%, from 14.2 to 50.7 mg.L-1. The most appropriate conditions were C=60% and N=600rpm, under which the highest red pigment absorbance (3.3U) and half of the highest citrinin concentration were obtained.

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