Bitki Pigmentlerinin Kromatografisi

Kağıt kromatografisiyle klorofil ve karotenoidleri ayırma

Qualitative Analysis Intermediate (High School) 60 dak ~$8,00

Hedef

Kağıt kromatografisi ile bitki pigmentlerini ayırmak, tanımlamak ve her pigment için Rf değerlerini hesaplamak.

Arka Plan

Paper chromatography separates mixtures based on differential affinity for the stationary phase (paper) and mobile phase (solvent). Plant leaves contain multiple pigments: chlorophyll a (blue-green), chlorophyll b (yellow-green), xanthophylls (yellow), and carotenoids (orange). These pigments have different polarities, causing them to travel different distances up the paper as the solvent front advances.

Güvenlik Uyarıları

  • Acetone and petroleum ether are highly flammable — no open flames
  • Work in a well-ventilated area or fume hood
  • Avoid inhaling solvent vapors
  • Petroleum ether is a skin irritant

Gerekli KKD

goggles gloves lab_coat

Malzemeler

  • Fresh spinach leaves (5–10 leaves)
    Or other dark green leaves
  • Acetone or isopropanol (50 mL)
    Extraction solvent
  • Petroleum ether (30 mL)
    Chromatography solvent
  • Chromatography paper (2 strips)
    Whatman No. 1 or equivalent
  • Sand (1 teaspoon)
    For grinding

Ekipman

Mortar and pestle Beaker (250 mL) with watch glass cover Pencil (not pen) Ruler Capillary tube Scissors

Prosedür

1

Grind spinach leaves with a pinch of sand and 5 mL acetone in a mortar until a deep green extract forms.

5 dak Acetone is flammable
2

Draw a pencil line 2 cm from the bottom of the chromatography paper. Apply the extract using a capillary tube in a small spot. Let dry and reapply 3–4 times to concentrate.

10 dak
3

Pour petroleum ether into the beaker to a depth of about 1 cm. Suspend the paper strip so the origin line is just above the solvent level.

5 dak Work in fume hood
4

Cover the beaker with a watch glass and let the solvent rise by capillary action. Do not disturb until the solvent front is 1–2 cm from the top.

25 dak
5

Remove the paper, immediately mark the solvent front with pencil. Let dry completely.

5 dak
6

Identify the colored bands: carotenoids (orange, highest Rf), xanthophylls (yellow), chlorophyll a (blue-green), chlorophyll b (yellow-green, lowest Rf). Calculate Rf values for each band.

10 dak

Beklenen Sonuçlar

Four or more colored bands should be visible. Carotenoids (orange) travel farthest (Rf ≈ 0.9–0.95). Xanthophylls (yellow) at Rf ≈ 0.7. Chlorophyll a (blue-green) at Rf ≈ 0.5. Chlorophyll b (yellow-green) at Rf ≈ 0.4.

Temizlik

Allow all solvents to evaporate in the fume hood. Dispose of paper in general waste. Clean mortar and pestle thoroughly.

Ayrıntılar

Kategori
Qualitative Analysis
Zorluk
Intermediate (High School)
Süre
60 dak
Tahmini Maliyet
$8,00
Adımlar
6
Malzemeler
5

Daha Fazla Deney

Alev Emisyon Spektroskopisi 60 min Anyon Tayin Testleri 60 min Bilinmeyen Madde Tanımlama Görevi 75 min Çökeltme ile Katyon Tayini 90 min Halojenler için Beilstein Testi 25 min Karbonhidratlar için Nişasta-İyot Testi 30 min Metal İyonları için Boraks Boncuk Testi 45 min pH İndikatörü Gökkuşağı 45 min Sabun Çözeltisiyle Su Sertliği Testi 40 min

Frequently Asked Questions

What is the objective of Bitki Pigmentlerinin Kromatografisi?
Kağıt kromatografisi ile bitki pigmentlerini ayırmak, tanımlamak ve her pigment için Rf değerlerini hesaplamak.
How difficult is Bitki Pigmentlerinin Kromatografisi?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for Bitki Pigmentlerinin Kromatografisi?
Key safety precautions include: Acetone and petroleum ether are highly flammable — no open flames; Work in a well-ventilated area or fume hood; Avoid inhaling solvent vapors.
What materials are needed for Bitki Pigmentlerinin Kromatografisi?
The main materials required are: Fresh spinach leaves, Acetone or isopropanol, Petroleum ether, Chromatography paper, Sand.
What results should I expect from Bitki Pigmentlerinin Kromatografisi?
Four or more colored bands should be visible. Carotenoids (orange) travel farthest (Rf ≈ 0.9–0.95). Xanthophylls (yellow) at Rf ≈ 0.7. Chlorophyll a (blue-green) at Rf ≈ 0.5. Chlorophyll b (yellow-green) at Rf ≈ 0.4.