Effect of Bile Salts on Pancreatic Lipase Activity

Introduction Pancreatic lipase, is secreted from the pancreas, that hydrolyzes dietary fat molecules in the human digestive system, converting triglyceride substrates found in ingested oils to monoglycerides and free fatty acids.

Bile consists of watery mixture of organic and inorganic compounds. Bile can either pass directly from the liver where it is synthesized into the duodenum through the common bile duct where they coat and emulsify large fat droplets into smaller droplets, thus increasing the overall surface area of the fat,

which allows the lipase to break apart the fat more effectively, or bile stored in the gallbladder when not immediately needed for digestion

Bile salts are important in the digestion of fats because they lower the surface tension of the fatty materials which enables them to be emulsified in an aqueous medium. As emulsifiers, they greatly increase the surface area of the fatty substrate and hasten the hydrolysis by increased enzyme catalysis Surface tension is a property of the surface of a liquid that allows it to resist an external force

Method A 0. 5 ml Vegetable oil 1. 0 ml Sodium cholate 2 ml Pancreatin solution B 0. 5 ml Vegetable oil 1. 0 ml H 2 O 2 ml Pancreatin solution Mix and cover the flasks, then incubate at 45 C for 90 min

Shake by rotation each of flasks at 15 min intervals Then add 8 drops of phenolphthalein indicator to both flasks and titrate against 0. 05 N sodium hydroxide to a distinctly permanent pink (30 sec at least)end point. Record the titration volumes and calculate the meg. y free fatty acids produced with and without the presence of bile salts.

Calculation C 1 X V 1 = C 2 X V 2 Blank: 1 - 0. 01 X V 1(Na. OH) = C 2 X 0. 5 Sample: 2 - 0. 01 X V 1 = C 2 X 0. 5 1 -2 = Net free fatty acid in 0. 5 ml of fat