1. The assay of Tissue Glycogen Glycogen is a polysaccharide of glucose which functions as the secondary short term energy storage in animal cells. It is made primarily by the liver and the muscles.

2. *Principle Glycogen is released from the tissue by heating with strong alkali precipitated on the addition of ethanol. Sodium sulphate is added as a co precipitant to give a quantitative yield of glycogen. The polysaccharide is then hydrolyzed in acid and the glucose released is estimated.

3. 1.5 g 2ml KOH Boiling water bath 60 30 15 45 5 10 20 2535 40 50 55 20 min. Occasional Shaking 0.2ml saturated Na 2 SO 4 Occasional Shaking 5ml Ethanol 95% Stand on ice 5min. Centrifuge 10min at 4500rpm 1. Isolation of Glycogen 5 min.

4. ppt 5ml D.W. Warm Complet to 10ml with D.W. Mix 1. Isolation of Glycogen Keep it for the next week

5. 1ml HCL 2. Hydrolysis & Estimation of Glycogen Boiling water bath 60 30 15 45 5 10 20 2535 40 50 55 1 hour 1drop phenol red 0.5 mol/L NaOH 1ml sample Dilute to 5ml with D.W.

6. 3,5-dinitrosalicylic acid Method 1ml sample 2ml DNS Boiling water bath 60 30 15 45 5 10 20 2535 40 50 55 5min. COOL 7ml D.W. Read the Optical Density at 540 nm

7. Results Samar A. Damiati