Co-production of tannase and gallic acid by a novel Penicillium rolfsii (CCMB 714)

Abstract

A novel tannase and gallic acid-producing Penicillium rolfsii (CCMB 714) was isolated from cocoa leaves from the South of Bahia. The influence of nutritional sources and the simultaneous effect of parameters involved in the fermentation process were available. Tannase (9.97 U mL⁻¹) and gallic acid (9 mg mL⁻¹) production were obtained in 48 h by submerged fermentation in non-optimized conditions. Among the carbon sources, tested gallic acid and tannic acid showed the highest tannase production (p<.05) when compared with methyl gallate and glucose. After optimization using the temperature and tannic acid concentration as variables with the Central Compound Rotational Design (CCRD), the maximal tannase production (25.6 U mL⁻¹) was obtained at 29.8 °C and 12.7%, respectively, which represents an increase of 2.56 times in relation to the initial activity. The parameters optimized for the maximum production of gallic acid (21.51 mg mL⁻¹) were 30 °C and 10% tannic acid. P. rolfsii CCMB 714 is a new strain with a high tannase and gallic acid production and the gallic acid produced is very important, mainly for its applications in the food and pharmaceutical industry.

Keywords:

• Fungi
• gallic acid
• microbial biotechnology
• process optimization
• submerged fermentation
• tannase

Acknowledgments

The authors are grateful to Ronaldo Costa Argôlo Filho, PhD. and Leandro Loguécio PhD. for assistance with the molecular identification of P. rolfsii CCMB 714.

Additional information

Funding

This work was supported by ‘Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB)’ under grant [PAM0002/2014]; and ‘Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)’ under Grant [MCTI/CNPq/Universal 14/2014].