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Evaluation of Oil Extraction Methods from Corn Masa By-Product Stream

This study investigates oil extraction methods from corn masa by-products, assessing the efficiency of conventional solvent extraction with hexane compared to supercritical fluid extraction (SFE) using CO2. The research identifies the concentration of oil in high and low-density fractions within the masa by-products. Results indicated a consistent yield with SFE, outperforming traditional methods, highlighting potential synergistic effects. Recommendations include testing alternative solvents and varying extraction ratios to optimize oil recovery.

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Evaluation of Oil Extraction Methods from Corn Masa By-Product Stream

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  1. Quantification of Oil Present in Corn Masa By-product Stream Amy Dee Schlechte Maitri Thakur

  2. Agenda • Introduction to Corn Masa • Project Objectives • Procedure • Results and Discussions • Conclusion • Future Recommendations • Questions

  3. Introduction to Corn Masa • Corn is a Valuable Commodity • Starch, Cereal, Tortillas, etc…. • Corn Masa Processing (Nixtamalization) • Grain Cooked with H20 & Lime • Steeped • Separated • Cooked Grain • Steep Liquor

  4. Introduction • Nutrient Loss in Steeping Liquid • Fiber, Ash, Minerals, Proteins, Oil • Oil Extraction Methods • Solvent Extraction using Hexane • Supercritical Fluid Extraction (SFE) using CO2

  5. Objectives • Find a Suitable Method for Oil Extraction • Compare Solvent Extraction & Super Critical Fluid Extraction Methods • Determine if Oil is Concentrated in High or Low Density Fraction of By-product

  6. Procedure • Obtained 2 Samples - Minsa Red Oak, Iowa • Dried Samples @ 50o C for 7 Days • Performed Solvent Extraction & SFE

  7. Solvent Extraction Procedure • Combined 25g Dried Masa w/ 75 ml Hexane • Filtered & Replaced Solvent 3 Times/24 Hrs • Accumulated 1200ml of Solvent • Used Rotary Evaporator to Reclaim Oil from Solvent

  8. SFE Procedure • Sample 2 Centrifuged @ 4400 RPM for 20 Minutes • High Density Fraction • Low Density Fraction • SFE Performed using CO2 • 5 Samples (2-3g each) • 2 Reps @ 42 min/cycle

  9. SFE Process • Supercritical conditions 8500 psi and 1200 C

  10. Results & Discussion

  11. Results & Discussion • Hexane Extraction • Low Percentage Oil Collected • Consistent Results • Test Implications • Oil Still Contained • Low Oil Content

  12. Results & Discussion Masa 1 High Density Low Density Masa 2 Hex Ext.

  13. Results & Discussion • SFE • Consistent Results From Duplicate Tests • Greater Yield than Solvent Extraction • Test Implications • Solvent Extraction + SFE = Higher Extractable Oil • Consistent Results • High & Low Density Samples • Masa 1 & Masa 2

  14. Conclusions • Low Overall Oil Content • SFE vs. Solvent Extraction • Synergistic Effects • Equal Distribution of Oil

  15. Future Recommendations • Use a Different Solvent (Methanol & Chloroform) • Perform Solvent Extraction with different ratios of Sample to Solvent • Perform Additional Tests With High and Low Density Fractions

  16. Questions??

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