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|Title: ||探討Aspergillus terreus BCRC 31128利用稻稈酸水解液生產衣康酸之研究|
|Issue Date: ||2015-09-23 11:12:30 (UTC+8)|
|Abstract: ||摘要 |
;With the advances in modern fermentation industry, its application has been gradually extended to all kinds of domestic and industrial products. Fermentation products of itaconic acid has become popular in recent years. Moreover, the US department of energy has enlisted itaconic acid as one of the twelve kinds of important biochemicals with potential advantages in the future. Itaconic acid, also known as methylenesuccinic acid, is a white crystalline naturally occurring organic compound. It is non-toxic, and readily biodegradable. It can be used in making plastics, synthetic resin, paint, paper, pharmaceutical, pesticide, silk and other applications.
In the past, air pollution related environmental problems have been reported by agricultural waste treatment. Hydrolysis of rice straw leads to the conversion of cellulose and hemicellulose, the common constituents into monosaccharides. These monosaccharides can be used as carbon source for fermentation of itaconic acid. The method does not only promote the economic production of itaconic acid but also solve the problem of the subsequent processing of agricultural waste. Previous studies have indicated that acid hydrolysis method is rapid and economic for destruction of lignin sheath and exposing the celluose and hemicellulose to hydroylsis. However, during the dilute acid treatment, different inhibitors are also produced. Among them, acetic acid, furfural, HMF have deleterious effect on the fermentation process.
In this research, we have tried to optimize rice straw pretreatment with dilute acid hydrolysis. Results suggested that 1% (v/v) H2SO4, dilute acid treatment at 1.2 atm pressure and 121oc for 60 min is optimal. In this mode of operation, reducing sugars (27.14 g/L), acetic acid (0.5 g/L), furfural (0.1 g/L), HMF (0.013 g/L) were obtained. We have also focused on the effective removal of the inhibitors. Activated charcoal and PDMS sponge were employed for this process. Acetic acid, furfural, HMF can be removed about 30%, 98%, 90% with activated charcoal. However, furfural, HMF can be removed about 50% with PDMS sponge. Before removing the inhibitors, we have also studied the effects of inhibitors for fermentation. Surprisingly, the results indicated that acetic acid can promote the production of itaconic acid at a concentration less than 0.625g/L with increasing pH.
|Appears in Collections:||[化學工程與材料工程研究所] 博碩士論文|
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