تفاعل #54968

معادلة التفاعل

5-Allyl-5-(β-carboxy-α-methyl-ethyl)-barbituric acid

dicyclohexyl carbodiimide

p-nitrophenol

→

barbituric acid

المذيبات

DMF

dimethyl formamide

DMF

ظروف التفاعل

المعالجة

1. 1
   أخرىat 4° C
2. 2
   أخرىthe mixture was evaporated to dryness
3. 3
   workup.DISSOLUTIONdissolved in 1.5 ml
4. 4
   workup.ADDITIONof a 1:1 mixture of glycerine-water
5. 5
   workup.ADDITIONBovine serum albumin (20 mg.) was added
6. 6
   أخرىto react for eight hours at room temperature
7. 7
   أخرىovernight
8. 8
   أخرىat 4° C
9. 9
   أخرىThe product was then dialyzed
10. 10
    workup.DISTILLATIONagainst distilled water for two days
11. 11
    أخرىto remove unreacted barbituric acid derivative

الإجراء التجريبي

5-Allyl-5-(β-carboxy-α-methyl-ethyl)-barbituric acid (10 mg.) was dissolved in 0.5 ml. dimethyl formamide (DMF) and was treated first with a solution of 5 mg. dicyclohexyl carbodiimide (DCC) in 0.5 ml. DMF and then with a solution of 12 mg. p-nitrophenol in 0.5 ml. DMF at 4° C. After standing overnight at this temperature, the mixture was evaporated to dryness and then dissolved in 1.5 ml. of a 1:1 mixture of glycerine-water. Bovine serum albumin (20 mg.) was added and the mixture was allowed to react for eight hours at room temperature and then overnight at 4° C. The product was then dialyzed against distilled water for two days to remove unreacted barbituric acid derivative and the p-nitrophenol which was displaced from the barbituric acid by the protein, to afford the bovine serum albumin-barbituric acid conjugate. The degree of substitution was estimated to be 2-3 moles of barbiturates per mole of protein, calculated from the extinction coefficient of the absorbtion at 202 mμ.

المصدر