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Related Experiment Videos

High-yield fermentation of pentoses into lactic acid.

P V Iyer1, S Thomas, Y Y Lee

  • 1Chemical Engineering Department, Auburn University, AL 36849-5127, USA.

Applied Biochemistry and Biotechnology
|June 13, 2000
PubMed
Summary

This study reveals Lactobacillus casei subsp. rhamnous can efficiently ferment xylose, a sugar typically unusable by Lactobacillus species. This discovery offers potential for improved biofuel production and industrial applications.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Industrial Fermentation

Background:

  • Lactobacillus species typically cannot ferment xylose, limiting their use in certain industrial processes.
  • Xylose is a major component of hemicellulose, a key sugar in lignocellulosic biomass.

Purpose of the Study:

  • To investigate the fermentation capabilities of Lactobacillus casei subsp. rhamnosus (ATCC 10863) regarding xylose utilization.
  • To characterize the fermentation kinetics and product yields of this strain on xylose.

Main Methods:

  • Cultivation of Lactobacillus casei subsp. rhamnosus (ATCC 10863) on xylose-containing media.
  • Analysis of sugar consumption, lactic acid production, and byproduct formation.
  • Fermentation trials with mixed sugars and acid-treated softwood hydrolysate.

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Main Results:

  • Lactobacillus casei subsp. rhamnosus demonstrated efficient xylose fermentation, comparable to glucose fermentation.
  • High lactic acid yield (>80%) and significant volumetric productivity (0.38 g/L.h) were observed.
  • The strain exhibited tolerance to lactic acid and toxins, and could ferment mixed sugars from lignocellulosic hydrolysates.

Conclusions:

  • Lactobacillus casei subsp. rhamnosus possesses a unique ability to efficiently ferment xylose, expanding its potential industrial applications.
  • This strain's robustness and ability to utilize mixed sugars make it a promising candidate for lignocellulosic biorefineries.