Fettspaltningen

Fettspaltningen, also known as lipolysis, is the enzymatic hydrolysis of fats, primarily triglycerides, into glycerol and free fatty acids. It is a fundamental process in digestion as well as in certain biotechnological applications.

In humans, fat digestion begins with emulsification by bile salts in the small intestine, which increases the surface area of fat droplets. Pancreatic lipase, with help from the cofactor colipase, then hydrolyzes triglycerides to free fatty acids and 2-monoacylglycerol. Some triglycerides are initially broken down to diacylglycerols and free fatty acids by gastric lipase in the stomach, but the small intestine is the major site of fat hydrolysis. The resulting products form micelles with bile salts, aiding transport to the intestinal mucosa where absorption occurs. Within enterocytes, absorbed fatty acids and monoacylglycerols are reassembled into triglycerides and packaged into chylomicrons for transport via the lymphatic system.

Fettspaltningen is essential for energy acquisition and nutrient utilization, and its efficiency can be affected by conditions such as pancreatic insufficiency, cystic fibrosis, or malabsorption disorders, leading to steatorrhea and nutrient deficiencies.

Outside physiology, fettspaltningen also has industrial relevance. Lipases are used to catalyze selective fat hydrolysis and transesterification in food processing, detergent formulations, and the production of biodiesel, where triglycerides are converted into glycerol and fatty acid esters.

Overall, fettspaltningen describes the biochemical breakdown of fats into absorbable components and its applications in science and industry.