Industrial extraction of polyphenolic compounds from tea
is mainly based on maceration combined with agitation,circulation, ultrasonic, microwave or enzymatic treatment
(Lee and Lee 2008). A way to enhance compound extraction
could be to grind plants. Indeed, fine grinding reduces particle
size, thickens particle size distribution, and increases specific
surface area, which lead to the improvement of material
functionalities (Zhao et al. 2009; Zhang et al. 2012; Barnwal
et al. 2015). However, grinding conditions have to be chosen
carefully. Indeed, during grinding, temperature increases
biochemical alterations of food materials and may result in
modifications of their physicochemical properties (Maaroufi
et al. 2000) like color alteration (Singh and Goswami 1999),
which lowers their organoleptic properties (Murthy et al.
1999) and may cause bioactivity losses (Pesek et al. 1985).