Amylase is a digestive enzyme in saliva and the pancreas. It breaks down starch (long chains of sugar molecules) into simpler sugars like maltose. Digestion begins in your mouth before food even reaches your stomach.

Why does bread taste sweeter the longer you chew?

Salivary amylase breaks the starch in bread into simple sugars as you chew. The longer you chew, the more sugar is released, which is why bread flavor becomes noticeably sweeter after about 30 seconds of chewing.

How does the iodine test show whether starch is present?

Iodine solution turns dark blue-black when it contacts starch. If amylase has broken all the starch into sugars, nothing remains to react with the iodine and the solution stays its original amber color.

Can saliva digest food outside the body?

Yes. In this experiment, saliva mixed with starch solution at body temperature (37 degrees Celsius) will break down the starch over time. Some traditional fermented foods have historically used human saliva as the enzyme source for this very reason.

Quizzy

Food

Saliva Power: How Your Mouth Starts Digestion

April 9, 2026Ages 3–9

Key Insight

Digestion starts in your mouth! Discover how enzymes in your saliva turn bread into sugar with this simple chemistry test.

📖 Explanation

🎒 For Ages 6-9

Chemical vs. Mechanical Digestion

Chewing is mechanical, but your saliva has Amylase, a chemical 'scissors' that cuts long starch molecules into tiny sugar molecules. This is why bread starts to taste sweet if you chew it for a long time!

❓ Frequently Asked Questions

What is amylase?: Amylase is a digestive enzyme in saliva and the pancreas. It breaks down starch (long chains of sugar molecules) into simpler sugars like maltose. Digestion begins in your mouth before food even reaches your stomach.
Why does bread taste sweeter the longer you chew?: Salivary amylase breaks the starch in bread into simple sugars as you chew. The longer you chew, the more sugar is released, which is why bread flavor becomes noticeably sweeter after about 30 seconds of chewing.
How does the iodine test show whether starch is present?: Iodine solution turns dark blue-black when it contacts starch. If amylase has broken all the starch into sugars, nothing remains to react with the iodine and the solution stays its original amber color.
Can saliva digest food outside the body?: Yes. In this experiment, saliva mixed with starch solution at body temperature (37 degrees Celsius) will break down the starch over time. Some traditional fermented foods have historically used human saliva as the enzyme source for this very reason.

🧠 Quick Knowledge Check

Q1 / 30%

What is amylase?

Step 1 / 2

🧪 Starch Disappearing Act

~20 min

Use iodine to prove that saliva destroys starch.

🛒 Supplies

📋 Steps

1
🥣 Make starch water
Mix a little cornstarch with water in two cups. Add iodine to turn them both dark blue.
2
✨ The Enzyme Test
Add your saliva to one cup. Wait 10 minutes. The blue color will disappear as the starch is eaten by the enzyme!

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