دانلود رایگان مقاله ارزش گذاری ضایعات میوه و سبزیجات از بازارهای باز برای تولید 2،3-بوتان دیول

Abstract

The bacterial strain Enterobacter ludwigii FMCC 204 was selected as the most efficient 2,3- butanediol (BDO) producer among five strains when cultivated on glucose, fructose, mannose, arabinose, xylose, galactose and sucrose in shake flask cultures. Plums, apples and pears were used for the production of fermentation medium via sequential maceration, suspension in water and centrifugation to collect the supernatant. Sugar production from mixed vegetables was evaluated via sulphuric acid treatment leading to 65.8 % (w/w) of hemicellulose hydrolysis yield at initial solid concentrations of 50 g/L (on a dry basis) treated with 3% (v/v) H2SO4. Fed-batch cultures of E. ludwidgii on fruit derived feedstock resulted in BDO concentration, yield and productivity of 50 g/L, 0.4 g/g and 0.41 g/L/h. BDO production from vegetable waste hydrolysates via fed-batch cultures led to BDO concentration of 17.6 g/L. This study demonstrated that fruit and vegetable wastes from open markets can be used as fermentation feedstocks for BDO production.

 Conclusion

Fruit and vegetables discarded as waste from open markets are rich in carbohydrates and can be used as fermentation media for the production of BDO. In this study, the bacterial strain E. ludwigii was initially selected as efficient BDO producer among five strains and it was subsequently evaluated for BDO production using fruit extracts and vegetable acid hydrolysates. Fed-batch cultures led to the production of 50 g/L of BDO from fruit waste and 7.6 g/L of BDO from vegetable acid hydrolysates. Further optimization of the fermentation process is required in order to achieve higher productivity, yield and final BDO concentration.