Biodiesel Production from Brassica juncea Using Oleaginous Yeast

Area of Science:

• Biotechnology
• Renewable Energy
• Biochemistry

Background:

• Lignocellulosic biomass presents a sustainable feedstock for biofuel production.
• Oleaginous yeasts are capable of accumulating lipids suitable for biodiesel synthesis.
• Cost-effective pretreatment and optimized fermentation are crucial for efficient biodiesel production.

Purpose of the Study:

• To evaluate Brassica juncea as a low-cost substrate for biodiesel production.
• To optimize the growth and lipid production of oleaginous yeast (Cryptococcus sp. MTCC 5455).
• To produce and characterize biodiesel from yeast-derived lipids.

Main Methods:

• Thermochemical pretreatment of Brassica juncea using dilute sodium hydroxide.
• Optimization of yeast lipid and biomass production using response surface methodology (RSM) and central composite design (CCD).
• Transesterification of yeast lipids using immobilized lipase and biodiesel property analysis.

Main Results:

• Optimized pretreatment achieved significant lignin and hemicellulose removal, increasing cellulose content by 8.4%.
• Maximum biomass and lipid yields of 32.50 g/L and 11.05 g/L were obtained under optimized conditions (30°C, pH 6.0, 5 days).
• Biodiesel produced met ASTM D975 standards for specific gravity, viscosity, flash point, and cloud point.

Conclusions:

• Brassica juncea is a viable and economical substrate for yeast-based biodiesel production.
• The study demonstrates an effective strategy for lignocellulosic biomass valorization for green biodiesel synthesis.
• Optimized conditions enhance lipid accumulation in oleaginous yeast for sustainable biofuel applications.