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  • Characterization of a tannase from Emericella nidulans immobilized on ionic and covalent supports for propyl gallate synthesis.

Characterization of a tannase from Emericella nidulans immobilized on ionic and covalent supports for propyl gallate synthesis.

Biotechnology letters (2012-12-18)
Heloísa Bressan Gonçalves, João Atílio Jorge, Benevides Costa Pessela, Glória Fernandez Lorente, José Manuel Guisán, Luis Henrique Souza Guimarães
ABSTRACT

The extracellular tannase from Emericela nidulans was immobilized on different ionic and covalent supports. The derivatives obtained using DEAE-Sepharose and Q-Sepharose were thermally stable from 60 to 75 °C, with a half life (t50) >24 h at 80 °C at pH 5.0. The glyoxyl-agarose and amino-glyoxyl derivatives showed a thermal stability which was lower than that observed for ionic supports. However, when the stability to pH was considered, the derivatives obtained from covalent supports were more stable than those obtained from ionic supports. DEAE-Sepharose and Q-Sepharose derivatives as well as the free enzyme were stable in 30 and 50 % (v/v) 1-propanol. The CNBr-agarose derivative catalyzed complete tannic acid hydrolysis, whereas the Q-Sepharose derivative catalyzed the transesterification reaction to produce propyl gallate (88 % recovery), which is an important antioxidant.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Tannase from Aspergillus ficuum, powder, white, ≥150 U/g
Supelco
Propyl gallate, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Propyl gallate, ≥98%, FCC
Sigma-Aldrich
Propyl gallate, for microscopy, ≥98.0% (HPLC)
Sigma-Aldrich
Propyl gallate, antioxidant, ≥98.0% (HPLC)
Sigma-Aldrich
Propyl gallate, powder