Presentation is loading. Please wait.

Presentation is loading. Please wait.

A2 BIOLOGY. PHOTOSYNTHESIS: THIN LAYER CHROMATOGRAPHY.

Similar presentations


Presentation on theme: "A2 BIOLOGY. PHOTOSYNTHESIS: THIN LAYER CHROMATOGRAPHY."— Presentation transcript:

1 A2 BIOLOGY. PHOTOSYNTHESIS: THIN LAYER CHROMATOGRAPHY.

2 Typical results.

3 Position of solvent front. Origin.

4 Typical results. Position of solvent front. Origin. Mark centre of each solvent front eg.

5 Typical results. Position of solvent front. Origin.

6 1.Measure distance from Origin to each spot and the solvent front. 2.Calculate Rf value for each spot Rf = distance moved by spot (M) distance moved by solvent (N) 3. Identify chlorophyll A and B from following table:

7 Typical results. M N Rf = M N

8 1.Measure distance from Origin to each spot and the solvent front. 2.Calculate Rf value for each spot Rf = distance moved by spot distance moved by solvent 3. Identify chlorophyll A and B from following table: PigmentRf value Chlorophyll A0.58 Chlorophyll B0.40 Lutein0.24 Phaeophytin0.86 Vidaxanthin0.10

9 Key points. 1.The Rf value depends on the solvent used. It will affect how fast each solute travels up the paper. 2.Different plants will have evolved to produce different types of pigment. Seaweeds are a good example of this. distance moved by solvent 3. Rf = retardation factor. Retardation is by interaction with the paper(stationary phase), stronger interactions produce greater retardation and chemical spends less time dissolved in solvent (mobile phase). Review two-way chromatography.

10


Download ppt "A2 BIOLOGY. PHOTOSYNTHESIS: THIN LAYER CHROMATOGRAPHY."

Similar presentations


Ads by Google