Influence of process parameters on obtention of silica from rice husk ash by action of Fusarium oxysporum

Quimica nova

Silva, Mabel T. Born e¹  Soares, Carlos H. L.¹  Pineda-Vásquez, Tatiana G.¹  Hotza, Dachamir¹ 

[1] Universidade Federal de Santa Catarina, Florianópolis, Brasil

关键词: silica;    ash;    fungus;    biotransformation.;   

DOI  :  10.5935/0100-4042.20140131

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this work, anexperimental design was used to analyze the influence of process parameterson the production of extracellular enzymes such as β-glucosidaseand peroxidase, and their possible effect on the obtention of soluble and nanostructuredsilica from rice husk ash by the action of the fungus Fusarium oxysporum.Specifically, pH, fermentation time and glucose concentration in the culturemedium were varied. Statistical analysis indicated that the silica synthesisin the aqueous medium was strongly dependent on pH and time. Although the glucoseconcentration does not exert a direct influence on the biosynthesis of silica,it is an important parameter in the production of extracellular enzymes. Toprevent enzyme inhibition and provide higher dissolution of silica, it is recommendedto work at a pH close to neutral with a glucose concentration of 3 g L-1for at least 144 h.

【 授权许可】

CC BY