Physicochemical Properties of Powdered Green Teas in Korea

국내 시판 가루녹차의 이화학적 품질특성

  • Received : 2009.09.16
  • Accepted : 2009.10.30
  • Published : 2010.02.28

Abstract

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 ($14.63-25.39\;{\mu}m$) was similar to that of Japanese powdered green tea ($15.46-21.02\;{\mu}m$). 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.

Keywords

powdered green tea;physicochemical properties;shade;chlorophyll

References

  1. Matsuzaki TL, Hara Y. Antioxidative activity of the leaf catechins. J. Agric. Chem. Soc. Japan 59: 129-134 (1985)
  2. Higdon JV, Frei B. Tea catechins and polyphenols: Health effects, metabolism, and antioxidant functions, Cri. Rev. Food Sci. 43: 89-143 (2003) https://doi.org/10.1080/10408690390826464
  3. Tang S, Kerry JP, Sheehan D, Buckley DJ, Morrissey PA. Antioxidative effect of added tea catechins on susceptibility of cooked red meat, poultry, and fish patties to lipid oxidation. Food Res. Int. 34: 651-657 (2001) https://doi.org/10.1016/S0963-9969(00)00190-3
  4. Jung DW, Park SI. Preparation of drinkable yoghurt added with green tea powder. Korean J. Food Nutr. 18: 349-356 (2005)
  5. Park SI. Application of green tea powder for sikhe preparation. Korean J. Food Nutr. 19: 227-233 (2006)
  6. Goto T, Yoshida Y, Kiso M, Nagashima H. Simultaneous analysis of individual catechins and caffeine in green tea. J. Chromatogr. A 749: 295-299 (1996) https://doi.org/10.1016/0021-9673(96)00456-6
  7. Nakabayashi T, Ina K, Sakata K. Chemistry and Function of Green, Black and Oolong tea. Kogagu Press, Tokyo, Japan. pp. 20-51 (1994)
  8. Khan SM, Kour G. Subacute oral toxicity of chlorpyriphos and protective effect of green tea extract. Pestic. Biochem. Phys. 89: 118-123 (2007) https://doi.org/10.1016/j.pestbp.2007.04.005
  9. Kim JT. Science and Culture of Tea. Borimsa Publishing Co., Seoul, Korea. pp. 157-248 (1996)
  10. Mohan KVP, Gunasekaran P, Varalakshmi E, Hara Y, Nagini S. In vitro evaluation of the anticancer effect of lactoferrin and tea polyphenol combination on oral carcinoma cells. Cell Biol. Int. 31: 599-608 (2007) https://doi.org/10.1016/j.cellbi.2006.11.034
  11. Park JH. Studies on chemical composition in korean native tea plants. PhD thesis, Chonnam National University, Kwangju, Korea (1997)
  12. Chung DH. Components and Efficacy of Tea. Hongikjae, Seoul, Korea. pp. 71-73 (2004)
  13. Hu B, Wang L, Zhou B, Zhang X, Sun Y, Ye H, Zhao L, Hu Q, Wang G, Zeng X. Efficient procedure for isolating methylated catechins from green tea and effective simultaneous analysis of ten catechins, three purin alkaloids, and gallic acid in tea by high-performance liquid chromatography with diode array detection. J. Chromatogr. A 1216: 3223-3231 (2009) https://doi.org/10.1016/j.chroma.2009.02.020
  14. Yoshioka H, Sugiura K, Kawahara R, Hujita T, Makino M, Kamiya M, Tsuyumu S. Formation of radicals and chemiluminescence during the auto- oxidation of the catechins. Agri Biol. Chem. Tokyo 55: 2717-2723 (1991) https://doi.org/10.1271/bbb1961.55.2717
  15. Lee JW, Do JH. Market trand of health functional food and prospect of ginseng market. J. Ginseng Res. 29: 206-214 (2005) https://doi.org/10.5142/JGR.2005.29.4.206
  16. Song JM, Park KD, Lee KH, Byun YH, Park JH, Kim SH, Kim JH, Seong BL. Biological evaluation of anti-influenza viral activity of semisynthetic catechin derivatives. Antivir. Res. 76: 178-185 (2007) https://doi.org/10.1016/j.antiviral.2007.07.001
  17. Park JH, Lim KC. Growth and constituents of tea shoots for powder green tea. J. Medicinal Crop Sci. 10: 379-383 (2002)
  18. Kim KS, Kouzkue N, Han JS. Comparison of the ingredients at powdered green teas commercialized in Korea and Japan. Korean J. Food Culture 19: 177-183 (2004)
  19. Youn KS. Absorption characteristics of green tea powder as influenced by particle size. J. Korean Soc. Food Sci. Nutr. 33: 1720-1725 (2004) https://doi.org/10.3746/jkfn.2004.33.10.1720
  20. Caldwell CR, Britz SJ. Effect of supplemental ultraviolet radiation on the carotenoid and chlorophyll composition of green house-grown leaf lettuce (Lactuca sativa L.) cultivars. J. Food Compos. Anal. 19: 637-644 (2006) https://doi.org/10.1016/j.jfca.2005.12.016