Production of Invertases by Anamorphic (Aspergillus nidulans) and Teleomorphic (Emericela nidulans) Fungi under Submerged Fermentation Using Rye Flour as Carbon Source

Juliana Nunes e Oliveira Alves, João Atílio Jorge, Luis Henrique Souza Guimarães
DOI: 10.4236/aim.2013.35057                

Abstract

The production of invertases by anamorph (A. nidulans) and teleomorph (E. nidulans) was investigated. The best level of extracellular enzymatic production for anomorph was obtained in Khanna medium containing sucrose as carbon source, whereas for teleomorph the best production was archived using M5 medium containing inulin as carbon source. Despite this, rye flour was selected as carbon source. The extracellular enzyme production was higher for teleomorph than that observed for anomorph for all carbon sources used. The enzyme production was inhibited by the addition of fructose and glucose in the medium containing rye flour as carbon source. The best conditions to recover the higher enzymatic activity were temperature of 54℃ - 62℃ and pH of 4.8 5.6 for both enzymes determined by experimental design (CCRD). The stability of the temperatures at 40℃ and 50℃were similar for both enzymes. The invertases from the anomorph and teleomorph were activated by Mn²⁺, but the response of each one towards the presence of this cation was different with best activation observed for the anomorph enzyme (+80%). The extracellular enzymes were able to hydrolyze inulin, sucrose and raffinose. However, the affinity was higher for sucrose than inulin. In conclusion, the carbon source assimilation and the invertase production, as well as the enzymes properties, were different for the anomorph and teleomorph mycelia.

Keywords

Invertase; Fructofuranosidase; Aspergillus; Emericela

Conflicts of Interest

The authors declare no conflicts of interest.

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