Physicochemical Properties of Powdered Green Teas in Korea
2010
Lee, L.S., Korea Food Research Institute, Seongnam, Republic of Korea | Park, J.D., Korea Food Research Institute, Seongnam, Republic of Korea | Cha, H.S., Korea Food Research Institute, Seongnam, Republic of Korea | Lee, Y.M., Lotte RnD Center, Seoul, Republic of Korea | Park, J.W., Lotte RnD Center, Seoul, Republic of Korea | Kim, S.H., Korea Food Research Institute, Seongnam, Republic of Korea
This study was conducted to compare the physicochemical properties of powdered green teas produced in Korea and Japan including particle size, color, chlorophyll, caffeine and theanine. The average particle size of Korean powered green tea (14.63-25.39 μm) was similar to that of Japanese powdered green tea (15.46-21.02 μm). The surface color of shade-cultivated Haenam Green Tea (HN-1) had the highest negative 'a' value, which represents 'green' color. When the TCD (total color difference value) was measured in the samples, HN-1 was most similar to the premium powdered green tea of Japan (JA-1). Domestic shade-cultivated powdered green teas had 1.5-2 times greater chlorophyll content than powdered green teas produced from plants that were not cultivated in the shade. The presence of chlorophyll a resulted in a higher intensity of green color than the presence of chlorophyll b. A significant negative correlation was also observed between the color and the chlorophyll a, chlorophyll b and total chlorophyll contents. Specifically, chlorophyll a had the greatest impact on the green color of powdered green tea. The content of catechins, caffeine and theanine in Korean powdered green teas ranged from 14.679-20.128, 1.496-3.237 and 0.926-1.977 g/100 g, respectively. The caffeine and theanine contents were high in shade-cultivated powdered green teas. Based on the above results, domestic powdered green teas cultivated under shaded conditions had a quality similar to that of medium-quality green teas produced in Japan, and the overall quality of Korean powdered green tea was poorer than that of Japanese powdered green tea.
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