Metabolism of Nutrients in Stomach and Intestine Anusorn
Metabolism of Nutrients in Stomach and Intestine Anusorn Cherdthong, Ph. D 137748 Applied Biochemistry in Nutritional Science Email: anusornc@kku. ac. th E-learning: http: //ags. kku. ac. th/e. Learning/137748
Introduction Metabolism: ØCatabolism: large small molecule and receiving ATP ØAnabolism: small large molecule and spend ATP, NADPH
Metabolism in stomach Carbohydrate: overview ØMouth: -amylase ØTeeth ØEsophagus ØStomach: no amylase ØSmall/large intestine: enzymes ØRectal: excretion
Metabolism in stomach Wanapat et al. (2013)
Metabolism in stomach Carbohydrate: Rumen metabolism Ø poly mono saccharide: extracellular microbial enzyme: v. Cellulose—cellobiose v. Hemicellulose—cellobiose v. Pectin—methanol and pectic acid Ø Mono saccharide pyruvate Ø Pyruvate---VFA, CH 4 ØC 2, C 3 and C 4
Metabolism in stomach Carbohydrate: Rumen metabolism Mc. Donald et al. (2011)
Metabolism in stomach VFV synthesis in rumen Mc. Donald et al. (2011)
Metabolism in stomach Protein: overview in stomach ØGastrin hormone ØHCl excretion: low p. H (2. 0) ØPepsinogen excretion: proenzyme for peptide degrade
Metabolism in stomach Protein: Rumen q. Proteiolytic microorganism q. Bacteria q. Protozoa q. Fungi Mc. Donald et al. (2011)
Metabolism in stomach Lipid: overview in stomach ØNo digest in non ruminant stomach ØRuminant act by rumen microbes by: v. Hydrolysis v. Hydrogenation v. Isomerization
Metabolism in intestine Carbohydrate: ØRequire enzyme for pancreases: Ø -amylase Ø -glucosidase ØMaltase Ø -dextrinase
Metabolism in intestine Protein metabolism in small intestine: Modified from Cunningham (1992)
Metabolism in intestine Protein metabolism in small intestine: Modified from Cunningham (1992)
Metabolism in intestine Lipid metabolism in small intestine: ØTriacyl glycerol Ø Required bile salt as emulsifier ØExcreate cholecystokinin and secretin ØFormulation of mixed micelle for transfer and absorption ØBile recycle when reaction finished ØRequired pancreatic lipase
Metabolism in intestine Lipid: Absorption § Chylomicron: lipoprotein § Via lymph system---blood ---tissue § Metabolism in liver, storage Nelson and Cox (2000)
Metabolism in large intestine: Ø A few metabolism in this part Ø Digest some cellulose by-pass Ø Work by bacteria Ø Re-absorption of nutrients Ø Essential for equine: fiber digestion
Conclusion 1 Metabolism of nutrient in stomach 2 3 Metabolism of nutrient in intestine Utilization of nutrient in different animal al species
Thank you!
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