Abstract
Microbial fermentation for bio-based products is quickly becoming an integral component of the world infrastructure, as the processes encompassing the synthesis of these natural products becomes more efficient, environmentally friendly and cost effective to compete with existing products. Rising energy costs and increased awareness of global warming have motivated production of biomass-derived fuels and polymers. Bio-butanol and bio-ethanol are currently the most desired fermentation products, as these compounds can be applied to multiple uses, including the foundation for green fuel sources. This review focuses on biofuel production; butanol and ethanol from yeast and bacteria, and how these products are efficient and can be suitable alternative for petrochemical products. It also focuses on utilizing waste to be used as the carbon source for microorganisms to produce bio-based products in an attempt to reduce the overall cost.