We do not know a laboratory in which to sell these standards and are not as expensive. If someone could collaborate with us that would be appreciated.
Anyuri:
You can procure these sustances from Sigma.
Hi, Anyuri. I know there is a company who has the standards can meet your requirments, please let me know if you are interested in that.
Hi,
You can buy them at Alfa Chemistry. The links are below:
http://www.alfa-chemistry.com/search.aspx?q=quercetin
http://www.alfa-chemistry.com/search.aspx?q=gallic%20acid
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