Effects of brewing water on the sensory attributes and physicochemical properties of tea infusions

Abstract

The effects of brewing water on the sensory attributes and physicochemical properties of tea infusions made from Chinese teas were investigated. The tea infusions brewed in water with higher pH and total dissolved solids (TDS), generally had a darker color and lower overall sensory acceptability. Moreover, those infusions had less catechins, particularly galloylated-catechins, and lower antioxidant capacity. The teas with less fermentation contained more galloylated-catechins and had higher antioxidant capacity, but were much more susceptible to high mineral brewing water. Green tea was proved to be the most susceptible one, whereas dark tea the most stable one. Green tea infusions prepared with higher pH/TDS water were more rapidly oxidized, resulting in a darker color due to polymerization of catechins, when exposed to the air. These findings suggested that low mineral brewing water was better for Chinese tea, both from the sensory and health benefit perspectives.

Keywords: (+)-Catechin (PubChem CID: 1203); (−)-Catechin gallate (PubChem CID: 6419835); (−)-Epicatechin (PubChem CID: 72276); (−)-Epicatechin gallate (PubChem CID: 367141); (−)-Epigallocatechin (PubChem CID: 72277); (−)-Epigallocatechin gallate (PubChem CID: 65064); (−)-Gallocatechin (PubChem CID: 9882981); (−)-Gallocatechin gallate (PubChem CID: 199472); Brewing water; Caffeine (PubChem CID: 2519); Chinese teas; Physicochemical properties; Sensory attributes.