Abstract
In this work we study the effect of caffeine and taurine on the mobility of water molecules at 298 K using femtosecond mid-infrared and dielectric relaxation spectroscopy. We observe both molecules to have a slowing down effect on the mobility of surrounding water molecules: a single caffeine molecule slows down ∼9 water molecules, a single taurine molecule slows down ∼4 water molecules. The reorientation time constant of these slow water molecules is 4–5 times longer than the reorientation time constant of 2.5 ps of water molecules in bulk liquid water.
Highlights
Caffeine is considered to be the most widely used drug in the world [1]
In this work we report on a study of the dynamics of water in aqueous solution of caffeine and taurine
We study the reorientation dynamics of water in aqueous solutions of caffeine and taurine at room temperature (298 K) with femtosecond pump-probe spectroscopy
Summary
Caffeine is considered to be the most widely used drug in the world [1]. It enjoys enormous popularity in beverages like coffee, tea, soft drinks, and energy drinks. Caffeine stimulates the central nervous system [2] and boosts the human performance by speeding up reaction times [3, 4] and by increasing alertness [5]. Caffeine binds to adenosine receptors in the central nervous system. Adenosine is a neuromodulator that slows down neural activity and makes one feel sleepy. Caffeine speeds up neural activity [6]. Increasing the taurine concentration is believed to stimulate the heart activity [8]
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