Question
Describe the digestion of starch.
✓
Answer
Digestion of starch:
(a) Digestion of starch in the oral cavity: Food is mixed with saliva and salivary amylase or ptyalin converts starch into maltose, isomaltose, and limit dextrins.
Starch $\xrightarrow[\text { Amlylase + }cl^{-}]{\text { Pancreatic }}$ Maltose + Isomaltose + Limit dextrin.
(b) Digestion of starch in the stomach: Gastric juice does not contain carbohydrate digestive enzyme, hence no digestion of starch takes place in the stomach.
(c) Digestion of starch in the small intestine: $40 \%$ starch is partially digested by ptyalin while the remaining $60 \%$ starch is digested by pancreatic amylase.
Starch $\xrightarrow[\text { Amlylase + }cl^{-}]{\text { Pancreatic }}$ Maltose + Isomaltose + Limit dextrin.
The enzymes of intestinal juice act as below:
Maltose $\xrightarrow{\text { Maltase }} 2$ Glucose
Isomaltose $\xrightarrow{\text { Isomaltase }} 2$ Glucose
Surcrose $\xrightarrow{\text { Sucrase }}$ Glucose + Fructose
Lactose $\xrightarrow{\text { Lactase }}$ Glucose + Galactonse
Limit Dextrin $\xrightarrow[\text { Dextrinase }]{\text { Limit }}$ Glucose
The humans cannot digest the cellulose due to the absence of cellulose enzyme.
(a) Digestion of starch in the oral cavity: Food is mixed with saliva and salivary amylase or ptyalin converts starch into maltose, isomaltose, and limit dextrins.
Starch $\xrightarrow[\text { Amlylase + }cl^{-}]{\text { Pancreatic }}$ Maltose + Isomaltose + Limit dextrin.
(b) Digestion of starch in the stomach: Gastric juice does not contain carbohydrate digestive enzyme, hence no digestion of starch takes place in the stomach.
(c) Digestion of starch in the small intestine: $40 \%$ starch is partially digested by ptyalin while the remaining $60 \%$ starch is digested by pancreatic amylase.
Starch $\xrightarrow[\text { Amlylase + }cl^{-}]{\text { Pancreatic }}$ Maltose + Isomaltose + Limit dextrin.
The enzymes of intestinal juice act as below:
Maltose $\xrightarrow{\text { Maltase }} 2$ Glucose
Isomaltose $\xrightarrow{\text { Isomaltase }} 2$ Glucose
Surcrose $\xrightarrow{\text { Sucrase }}$ Glucose + Fructose
Lactose $\xrightarrow{\text { Lactase }}$ Glucose + Galactonse
Limit Dextrin $\xrightarrow[\text { Dextrinase }]{\text { Limit }}$ Glucose
The humans cannot digest the cellulose due to the absence of cellulose enzyme.
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