탄수화물의 아이오딘-전분 시험

아이오딘 용액으로 식품 시료의 전분 검출하기

Qualitative Analysis Beginner (Middle School) 30 분 ~$5.00

목표

아이오딘 시험으로 다양한 식품 시료의 전분을 확인하고, 청자색 착물이 형성되는 분자적 메커니즘을 이해한다.

배경

The starch-iodine test is one of the most visually striking qualitative tests in chemistry. Iodine (I₂) forms a deep blue-black complex with amylose, the helical component of starch. The iodine molecules slip inside the amylose helix, creating a charge-transfer complex that absorbs light strongly. This test does not work with simple sugars (glucose, sucrose) or with amylopectin alone, making it specific for amylose-containing starch.

안전 경고

  • Iodine solution stains skin and clothing
  • Do not taste any samples after adding iodine
  • Handle knife carefully when cutting food samples

필수 개인 보호 장비

goggles lab_coat

재료

  • Iodine solution (Lugol's) (10 mL)
    I₂/KI solution
  • Starch solution (1%) (10 mL)
    Positive control
  • Glucose solution (1%) (10 mL)
    Negative control
  • Food samples (Various)
    Potato, bread, rice, apple, etc.
  • Distilled water (50 mL)

장비

Spot plate or small dishes Dropper pipettes Knife for cutting food samples White paper background

실험 절차

1

Place small amounts of each food sample and control solutions in separate wells of the spot plate.

5 분
2

Add 2–3 drops of Lugol's iodine solution to the starch solution (positive control). Observe the blue-black color.

3 분
3

Add 2–3 drops to the glucose solution (negative control). Observe that the color remains amber/brown.

3 분
4

Add 2–3 drops of iodine to each food sample. Record the color change observed.

10 분
5

Classify each sample as starch-positive (blue-black) or starch-negative (amber/brown). Record in a data table.

9 분

예상 결과

Potato, bread, and rice should test strongly positive (deep blue-black). Apple and pure sugar solutions should remain amber/brown. The intensity of the blue color correlates with starch content.

정리

Dispose of iodine-treated samples in general waste. Rinse spot plates and pipettes with water.

세부 정보

카테고리
Qualitative Analysis
난이도
Beginner (Middle School)
소요 시간
30 분
예상 비용
$5.00
단계
5
재료
5

더 많은 실험

할로겐에 대한 베이슈타인 시험 25 min 음이온 확인 시험 60 min 침전에 의한 양이온 확인 90 min 비누 용액으로 경수 시험 40 min 식물 색소의 크로마토그래피 60 min 금속 이온에 대한 붕사 구슬 시험 45 min 미지 물질 확인 도전 75 min 불꽃 발광 분광 분석 60 min pH 지시약 무지개 45 min

Frequently Asked Questions

What is the objective of 탄수화물의 아이오딘-전분 시험?
아이오딘 시험으로 다양한 식품 시료의 전분을 확인하고, 청자색 착물이 형성되는 분자적 메커니즘을 이해한다.
How difficult is 탄수화물의 아이오딘-전분 시험?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for 탄수화물의 아이오딘-전분 시험?
Key safety precautions include: Iodine solution stains skin and clothing; Do not taste any samples after adding iodine; Handle knife carefully when cutting food samples.
What materials are needed for 탄수화물의 아이오딘-전분 시험?
The main materials required are: Iodine solution (Lugol's), Starch solution (1%), Glucose solution (1%), Food samples, Distilled water.
What results should I expect from 탄수화물의 아이오딘-전분 시험?
Potato, bread, and rice should test strongly positive (deep blue-black). Apple and pure sugar solutions should remain amber/brown. The intensity of the blue color correlates with starch content.