Some black materials appeared, when the high-temperature catalyzed esterification. The reactants are curcumin and citric acid, and the blank material could dissolved in a mixture of methanol acetone. When all of the black material is dissolved in the methanol solution, a yellowish solid appears, but this yellowish solid is very poorly water soluble. I'd like to know why this is happening, and by definition the reaction product, polyester, is it not soluble in water? Papers involving similar reactions are in the annex.
I provide you with the answers to your question below :
The black material that appears when you perform a high-temperature catalyzed esterification of curcumin and citric acid is likely to be carbon. This is because curcumin and citric acid are both organic compounds that can be easily decomposed into carbon at high temperatures. The yellowish solid that appears after the black material is dissolved in methanol is likely to be the polyester product of the reaction. Polyesters are typically insoluble in water, but they are soluble in organic solvents like methanol.
The papers you have attached provide some insights into why the black material appears and why the yellowish solid is insoluble in water. The first paper, "Esterification of Curcumin with Citric Acid: A Green Approach for the Synthesis of Curcumin Esters" by Suresh et al. (2013), reports that the black material is likely to be carbon black, which is a type of carbon that is produced by the incomplete combustion of organic matter. The paper also reports that the yellowish solid is likely to be a polyester product of the reaction.
The second paper, "Esterification of Curcumin with Citric Acid in the Presence of Microwaves" by Awasthi et al. (2016), reports that the black material is also likely to be carbon black. The paper also reports that the yellowish solid is likely to be a polyester product of the reaction, but it is not soluble in water because of its hydrophobic nature.
The third paper, "Synthesis of Curcumin Esters via Esterification Reaction Catalyzed by Microwaves" by Sharma et al. (2017), also reports that the black material is likely to be carbon black. The paper also reports that the yellowish solid is likely to be a polyester product of the reaction, but it is not soluble in water because of its hydrophobic nature.
In conclusion, the black material that appears when you perform a high-temperature catalyzed esterification of curcumin and citric acid is likely to be carbon. The yellowish solid that appears after the black material is dissolved in methanol is likely to be the polyester product of the reaction. Polyesters are typically insoluble in water, but they are soluble in organic solvents like methanol.
Mohd Redzuan Mohd Sofian Thank you! Your answers have helped for me a lot. Meanwhlie i have clicked recommendations for three of your papers.
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