反应详情

Sodium hydroxide (3.51 g) was dissolved in methanol (100 ml), and L-carnosine (9.96 g) was added to the solution to prepare a uniform solution. A solution with zinc acetate dihydrate (9.67 g) dissolved in methanol (145 ml) was added dropwise over 30 minutes to the uniform solution. As a result, white precipitate was gradually formed. After completion of the addition, the mixture was stirred for 2 hours, left to stand overnight and then filtered. The resultant filter cake was then washed with water (140 ml) and air-dried at 80° C. for 5 hours to obtain a crystalline L-carnosine zinc salt (12.4 g) as white powdery crystals.

1. customto prepare a uniform solution
2. additionwas added dropwise over 30 minutes to the uniform solution
3. customAs a result, white precipitate was gradually formed
4. additionAfter completion of the addition
5. waitleft
6. waitto stand overnight
7. filtrationfiltered
8. filtrationThe resultant filter cake
9. washwas then washed with water (140 ml)
10. customair-dried at 80° C. for 5 hours