In large scale fermentation processes, corn steep liquor is mainly used as a
In large scale fermentation processes, corn steep liquor is mainly used as a
Select an option to attempt
Correct Answer: Option B
Explanation
Corn steep liquor (CSL) is a byproduct of corn wet milling (steeping corn kernels in warm water +for 24–48 h). CSL is rich in: proteins and amino acids (~45% of dry weight) — PRIMARY USE: nitrogen source in fermentation media; vitamins (especially thiamine/B1); minerals (K, Mg, Ca, Zn, Fe); lactic acid (from Lactobacillus contamination during steeping). CSL is used as a cheap, complex nitrogen and growth factor source for producing: Penicillin (Fleming/Coghill’s WWII production); lysine; glutamate; riboflavin; many industrial enzymes. CSL replaced cottonseed flour and soybean meal as the preferred nitrogen source. It is NOT primarily used as a carbon or vitamin source — dextrose (corn starch hydrolysate) provides carbon.