The content of polyphenols in coffee beans as roasting, origin and storage effect | European Food Research and TechnologyThe content of polyphenols in coffee beans as roasting, origin and storage effect | European Food Research and Technology
Caffeine is purine alkaloid and nitrogen fertilization can increase the level of that alkaloid in coffee beans [25]. Not only ...
https://link.springer.com/article/10.1007/s00217-019-03388-9
Hydrophilic interaction liquid chromatography (HILIC)-a powerful separation technique | Analytical and Bioanalytical ChemistryHydrophilic interaction liquid chromatography (HILIC)-a powerful separation technique | Analytical and Bioanalytical Chemistry
... has compared the properties of various stationary phases used for the separation of pyrimidines and purines (polar compounds of ...
https://link.springer.com/article/10.1007/s00216-011-5308-5