Effect of the dried limes (Citrus aurantifolia) on the caffeine kinetic extraction in black tea leaves (kinetic and thermodynamic study)

ABSTRACT. The kinetic and thermodynamic parameters were studied for the extraction of caffeine in black tea leaves containing antioxidant dried limes (Citrus aurantifolia). Caffeine is widely used human consumption present any liquid suitable drinking except water. However, health environmental demerits make it significant to reduce much less concentration or decaffeination. Therefore, effect Citrus aurantifolia on followed by pseudo-first-order reaction, (pseudo-first-order rate constant (k), equilibrium absorbance (A∞)), activation parameters, energy (Ea), change enthalpy (ΔH#), entropy (ΔS#) Gibbs free (ΔG#) was calculated at four different temperatures 30, 60, 80, 100 °C. Using spectroscopic method solution (Ea = 13.32 kJmol-1) higher than mixed with lime 9.89 kJmol-1), collision molecules A-factor (1.96 min-1), large correlation factor (R2 0.95). ΔH#, ΔS#, ΔG# demonstrate heat absorption, irreversible, more spontaneous interaction caffeine.
 
 KEY WORDS: Caffeine, Tea leaves, aurantifolia, Thermodynamic Kinetic
 Bull. Chem. Soc. Ethiop. 2022, 36(3), 697-705. DOI: https://dx.doi.org/10.4314/bcse.v36i3.18