![PDF) The main constituents of coffee are caffeine , tannin , fixed oil , carbohydrates , and proteins . It contains 2-3 % caffeine , 3-5 % tannins , 13 % proteins , PDF) The main constituents of coffee are caffeine , tannin , fixed oil , carbohydrates , and proteins . It contains 2-3 % caffeine , 3-5 % tannins , 13 % proteins ,](https://i1.rgstatic.net/publication/345379358_The_main_constituents_of_coffee_are_caffeine_tannin_fixed_oil_carbohydrates_and_proteins_It_contains_2-3_caffeine_3-5_tannins_13_proteins_and_10-15_fixed_oils_In_the_seeds_caffeine_is_present_as_a_sal/links/5fa52814a6fdcc062418a6e0/largepreview.png)
PDF) The main constituents of coffee are caffeine , tannin , fixed oil , carbohydrates , and proteins . It contains 2-3 % caffeine , 3-5 % tannins , 13 % proteins ,
![Structural elucidation of tannins of spent coffee grounds by CP-MAS 13C NMR and MALDI-TOF MS - ScienceDirect Structural elucidation of tannins of spent coffee grounds by CP-MAS 13C NMR and MALDI-TOF MS - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0926669015001612-fx1.jpg)
Structural elucidation of tannins of spent coffee grounds by CP-MAS 13C NMR and MALDI-TOF MS - ScienceDirect
![Structural elucidation of tannins of spent coffee grounds by CP-MAS 13C NMR and MALDI-TOF MS - ScienceDirect Structural elucidation of tannins of spent coffee grounds by CP-MAS 13C NMR and MALDI-TOF MS - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0926669015001612-gr2.jpg)