TY JOUR TI COFFEE: CAFFEINE CONTENT AND ANTIOXIDANT ACTIVITY AT DIFFERENT STAGES OF EXTRACTION KW coffee KW arabica KW robusta KW soluble dry substances KW caffeine KW antioxidant activity KW extraction JO Bulletin of KSAU AU Nilova, L.. AU Malyutenkova, S.M. AU Tverskoy, V.R. AU Muhutdinov, R.R. PY 2024 IS 0 PB Krasnoyarsk State Agrarian University