PhysioEx 8 - • Boiled lipase doesn’t work and it...

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PhysioEx 8: Chemical and Physical Processes of Digestion Two factors affect digestive enzyme function: temperature and pH Salivary amylase breaks down starch into maltose a disaccharide IKI tests for starch and Benedict’s tests for sugars like glucose or maltose No starch digestion at all w/ peptidase and boiled amylase, but freezing doesn’t affect amylase Reduced starch digestion from amylase in ph 2 and 9 Stomach acid greatly deactivates salivary amylase because it only works well at ph 7 Amylase doesn’t work at all on cellulose but bacteria does well Boiled pepsin doesn’t work, and it doesn’t work in ph 9;reduced function in ph 7; normal at ph 2
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Unformatted text preview: • Boiled lipase doesn’t work and it doesn’t work in ph 2 • Need bile salts for higher effectiveness of lipase; and doesn’t work well in ph 9; normal at ph 7 • Bile salts emulsify, breaking down lipids into smaller droplets, increasing their surface areas so lipase can work on them since lipase only works on surfaces of lipid droplets because lipids are water insoluble and lipase is hydrolytic like all other digestive enzymes • Bile salts also form micelles that help absorb products of lipid digestion: fatty acids and monoglycerides...
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