Green tea has been known as a popular health-promoting beverage since ancient times, and consumption of green tea has been suggested to prevent many diseases including cardiovascular diseases and cancer (Butt & Sultan, 2009). The main bioactive components present in green tea are catechins, among which (−)-epigallocatechin-3-gallate (EGCG) is the major compound (Pinto, 2013). In addition to strong free radical scavenging capacity in food matrix as a powerful antioxidant, EGCG may exhibit a variety of medical efficacy such as potential antiviral activity and neuroprotective activity