Green Tea: Flavor Characteristics of a Wide Range of Teas Including
GREEN TEA: FLAVOR CHARACTERISTICS OF A WIDE RANGE OF TEAS INCLUDING BREWING, PROCESSING, AND STORAGE VARIATIONS AND CONSUMER ACCEPTANCE OF TEAS IN THREE COUNTRIES by JEEHYUN LEE B.S., Pusan National University, 2002 M.S., Kansas State University, 2004 AN ABSTRACT OF A DISSERTATION submitted in partial fulfillment of the requirements for the degree DOCTOR OF PHILOSOPHY Department of Human Nutrition College of Human Ecology KANSAS STATE UNIVERSITY Manhattan, Kansas 2009 Abstract A green tea descriptive sensory lexicon was developed by a highly trained panel, which identified, defined, and referenced 31 flavor attributes of green tea. The attributes were categorized as “green” (asparagus, beany, Brussels sprout, celery, parsley, spinach, green beans, and green herb-like), “brown” (ashy/sooty, brown spice, burnt/scorched, nutty, and tobacco), “fruity/floral” (fruity, floral/perfumy, citrus, and fermented), “mouthfeel” (astringent and tooth- etching), “basic tastes” (overall sweet and bitter), and other attributes (almond, animalic, grain, musty/new leather, mint, seaweed, and straw-like). Using the green tea lexicon, the flavor differences that exist among a wide range of green teas (n=138) produced in various countries were determined. Roast-processed teas were mostly responsible for brown-related flavors and steam-processed teas were mostly responsible for green-related flavors. Aroma analyses of green tea showed that the concentration of volatile compounds were much lower than stated in the literature. Brown, brown-related attributes, bitterness, and astringency became stronger and green and green-related attributes become weaker as the brewing time lengthened (1, 2, 5, and 20 min) and the water temperature increased (50, 70, 95°C).
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