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Biodiesel production from yeast Cryptococcus sp. using Jerusalem artichoke.

Mina Sung1, Yeong Hwan Seo1, Shin Han1

  • 1Department of Civil and Environmental Engineering, KAIST, 291 Daehakno, Yuseong-gu, Daejeon 305-701, Republic of Korea.

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Summary
This summary is machine-generated.

Jerusalem artichoke is a cost-effective substrate for yeast production. This study optimized conditions for high fructose yield and successful microbial lipid production for biodiesel.

Keywords:
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Area of Science:

  • Biotechnology
  • Microbiology
  • Sustainable Chemistry

Background:

  • Jerusalem artichoke (Helianthus tuberosus) is a rich source of inulin.
  • Developing cost-effective substrates for microbial lipid production is crucial for biodiesel.
  • Heterotrophic yeast fermentation offers potential for converting plant-based carbohydrates into valuable products.

Purpose of the Study:

  • To investigate Jerusalem artichoke as a cheap substrate for heterotrophic yeast production.
  • To optimize hydrolysis conditions for maximizing fructose yield from Jerusalem artichoke inulin.
  • To evaluate the potential of Jerusalem artichoke-derived fructose for microbial lipid production and biodiesel feedstock.

Main Methods:

  • Utilized Response Surface Methodology (RSM) to optimize fructose yield from Jerusalem artichoke powder.
  • Investigated nitric acid concentration, reaction temperature, and time for inulin hydrolysis.
  • Cultured the yeast strain Cryptococcus sp. heterotrophically using Jerusalem artichoke hydrolysate.
  • Measured lipid productivity and assessed lipid quality for biodiesel potential.

Main Results:

  • Achieved a maximum fructose yield of 54.0% under optimized conditions (12% dried Jerusalem artichoke powder, 0.57% nitric acid, 117°C, 49 min).
  • Nitric acid demonstrated superior catalytic activity for inulin hydrolysis compared to other acids.
  • The resulting fructose hydrolysate supported higher microbial growth than pure fructose.
  • Attained a lipid productivity of 1.73 g/L/d, exceeding that of a defined medium with pure fructose.
  • Lipid quality was deemed satisfactory for biodiesel feedstock.

Conclusions:

  • Jerusalem artichoke is a viable and economical substrate for heterotrophic yeast production.
  • Optimized nitric acid-catalyzed hydrolysis effectively converts Jerusalem artichoke inulin to fructose.
  • Jerusalem artichoke hydrolysate supports robust microbial growth and high lipid productivity, suitable for biodiesel.
  • This study highlights Jerusalem artichoke as a promising, low-cost option for sustainable biodiesel production.