Ethanol Production by Xylose Fermenting Yeast Cultures Using a Mixture of Dextrose and Xylose

Autori

  • Dhiraj Guriyan
  • Nidhi Paliwal Centre for Biotechnology, Maharshi Dayanand University, Rohtak-124001, India
  • Hari Mohan Centre for Medical Biotechnology, Maharshi Dayanand University, Rohtak-124001, India
  • Kamla Chaudhary Department of Microbiology, Maharshi Dayanand University, Rohtak-124001, India

Parole chiave:

dextrose, xylose, ethanol, yeast isolate, Saccharomyces cerevisiae

Abstract

Ever-increasing demand for motor fuels has led to the search for alternate sources of energy world over. Lignocellulosic biomass is the most abundant, renewable source which is being replenished through photosynthesis. In many developed countries, a number of “Biorefineries” have been set up to produce ethanol from plant biomass. However, ethanol productivities are still low. Moreover, distiller’s ethanologenic yeast Saccharomyces cerevisiae cannot utilize pentoses, with the result that about 30% sugar is left unutilized. Although recombinant technology is being used for genetic improvement of yeasts for formation of a mixture of sugar, in genetically engineered yeast strains, xylose fermentation is slow as compared to dextrose fermentation. Studies are being conducted in laboratories to isolate xylose fermenting yeast culture from natural sources. A number of promising yeast cultures were isolated, which could produce ethanol both in dextrose and xylose medium. A number of combinations of mixture of dextrose and xylose were used as substrate to produce ethanol by xylose fermenting yeast isolate. Yeast isolate F produces maximum ethanol in a mixture of dextrose and xylose in 72 h of fermentation. 

Dowloads

Pubblicato

2013-06-13

Fascicolo

V. 3 N. 1 (2013)

Sezione

Research Articles

Licenza

Declaration and Copyright Transfer Form

(to be completed by authors)

I/ We, the undersigned author(s) of the submitted manuscript, hereby declare, that the above manuscript which is submitted for publication in the STM Journals(s), is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

·         I/We will not withdraw the manuscript after 1 week of submission as I have read the Author Guidelines and will adhere to the guidelines.

·         I/We Author(s ) have niether given nor will give this manuscript elsewhere for publishing after submitting in STM Journal(s).

·         I/ We have read the original version of the manuscript and am/ are responsible for the thought contents embodied in it. The work dealt in the manuscript is my/ our own, and my/ our individual contribution to this work is significant enough to qualify for authorship.

·          I/We also agree to the authorship of the article in the following order:

Author’s name                                    

 

1. ________________

2. ________________

3. ________________

_______________

We  Author(s) tick this box and would request you to consider it as our signature as we agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal.