Comparison of Flavor-related Components of Polygonatum odoratum in Root by Growth Year

둥글레 근경의 연근별 향미관련 성분의 비교

  • Published : 2003.02.01


As part of studies on the high quality dunggule tea, made of Polygonatum odoratum root with different growth year were analyzed for their flavor compounds. The quality attributes related to flavors were compared between raw and roasted samples which were treated at $130^{\circ}C$ for 15 min. Free sugars in the roots were mainly composed of fructose ($3.59{\sim}4.83%,\;d.b.$), sucrose ($1.78{\sim}2.49%$), and glucose ($1.60{\sim}1.80%$). Threonine ($1,239{\sim}1,444\;mg/100g,\;d.b.$), arginine ($589{\sim}689$), histidine ($289{\sim}370$) were three major free amino acids. The root grown for three years showed the highest content in total free sugar and amino acids (p<0.05). There was negligible difference in proximate composition and Hunter's color parameter depending on the growth year of the roots. However, sensory scores on color, taste and aroma were highest in 3 years' root, which is found most suitable for the preparation of dunggule tea. The roasting of 3 years old root significantly reduced the content of fructose and sucrose (p<0.01). It caused most apparent changes in the decreasing amount of threonine and in the decreasing rate of lysine, showing the significant decrease in total free amino acid content (p<0.01).


  1. Ryu, K.C., Chung, H.W., Kim, K.T. and Kwon, J.H. Optimization of roasting conditions for high-quality Polygonatum odoratum tea. Korean J. Food Sci. Technol. 29: 776-783 (1997)
  2. Kwon, J.H., Ryu, K.C. and Lee, G.D. Dynamic changes in browning reaction substrates of Polygonatum odoratum roots during roasting. J. Korean Soc. Food Sci. Nutr 26: 654-661 (1997)
  3. Ryu, K.C., Chung, H.W, Lee, G.D. and Kwon, J.H. Color change and optimization of organoleptic properties of roasted Polygonatum odoratum tea. J. Korean Soc. Food Sci. Nutr. 26: 831-837 (1997)
  4. Kim, M.B., Kim, D.K., Lee, G.D. and Kwon, J.H. Optimization of roasting conditions Polygonatum sibiricum roots by a pressure roaster. J. Korean Soc. Food Sci. Nutr. 27: 80-86 (1998)
  5. AOAC. Official Methods of Analysis. 15th ed. Association of Official Analytical Chemists, Washington, DC, USA (1990)
  6. Kim, H.K., Lee, B.Y., Shin, D.B. and Kwon, J.H. Effects of roasting conditions on physicochemical characteristics and volatile flavor components of chicory roots. Korean J. Food Sci. Technol. 30: 1279-1284 (1998)
  7. Jang, J.K Physicochemical properties of the freeze dried ginseng and red ginseng processed from the fresh ginsengs stored at low temperature. Ph.D. dissertation, Kyungsang Univ., Jinju (1991)
  8. Kim, K.H. Volatile flavor components and formation model system of dunggule (Polygonatum sp.) tea and chicory (Cichicorium intybus L.) tea. M.S. thesis, Dongeui Univ., Busan (1998)
  9. Cha, W.S. Physico-chemical properties of Polygonatum starch. M.S. thesis, Chosun Univ., Gwangju (1980)
  10. Kwon, J.H., Belanger, J.M.R., Sigouin, M., Lanthier, J., Willemot, C. and Pare, J.R.J. Chemical constituents of Panax ginseng exposed to $\gamma$-irradiation. J. Agric. Food Chem. 38: 830-834 (1990)
  11. Larmond, E. Methods for sensory evaluation of food. Canada Department of Agriculture. Publication 1284: 27-30 (1970)
  12. Kwon, J.H., Lim, C.H., Ryu, K.C., Chung, H.W and Lee, G.D. Effect of steaming prior to roasting of Polygonatum odoratum roots on its water solubles and browning. Korean J. Postharvest Sci. Technol. Agri. Products 4: 155-162 (1997)
  13. Macrae, R. HPLC in food analysis. Academic Press Limited, London, UK (1988)
  14. Ko, S.R. Comparative study on chemical components and biological activities of panax species. Ph.D. dissertation, Jeonpook Univ., Jeonju (1994)
  15. Wang, P.S. and Sakurai, Y. Studies on flavor components of roasted barley, part . The production of flavor. Nippon Shokuhin Kogyo Gakkaishi 15: 514-518(1968)
  16. MAF. Dunggulecha. Korea traditional food collection of standard (1998-66), pp. 277-285. Ministry of Agriculture and Forestry, Seoul (1998)
  17. Kwon, J.H., Jacqueline, M.L. and Jocelyn, J.R. Effects of ionizing energy treatment on the quality of ginseng products. Radiat. Phys. Chem. 34: 963-967 (1989)
  18. Rural Development Administration National Crop Experiment Station. Classification of Korean medicinal plant resources, pp. 243-244. RDA, Suwon (1990)
  19. Seog, H.M. The effects of the roasting temperature on the formation of volatile compounds in the malted naked barley. Ph.D. dissertation, ChungAng Univ., Seoul (1987)
  20. Lim, S.J. and Kim, K.K. Hypoglycemic effect of Polygonatum odoratum var. Pluriflorum ohwi extract in streptozotocin-induced diabetic rats. Korean J. Nutr. 28: 727-739 (1995)
  21. Kim, K.H. Volatile flavor components and formation model system of dunggule (Polygonatum sp.) tea and chicory (Cichicorium intybus L.) tea. M.S. thesis, Dongeui Univ., Busan (1998)
  22. Rohan, T.A. and Stewart, T. The precursors of chocolate aroma, changes in the sugars during the roasting of cocoa beans. J. Food Sci. 31: 206-210(1966)
  23. Park, N.Y., Jeong, Y.J., Lee, G.D. and Kwon, J.H. Monitoring of Maillard reaction characteristics under various roasting conditions of Polygonatum odoratum root. J. Korean Soc. Food Sci. Nutr 29: 647-654 (2000)
  24. Park, N.Y. and Kwon, J.H. Flavor components of Polygonatum odoratum and the influence of heating condition. Food Ind. Nutr. 6: 3-12 (2001)
  25. Kim, T.J. Herbs of Fields and Mountains in Korea, p. 190. Kookil moonwhasa, Seoul (1994)
  26. Park, N.Y., Seo, J.H., Kim, Y.H. and Kwon, J.H. Comparison of flavor compounds in steamed-and nonsteamed-roasted Polygonatum odoratum roots by solid-phase micro extraction. Korean J. Food Sci. Technol. 32: 507-512 (2000)
  27. SAS. SAS Users Guide. SAS Institute Inc., Cary, NC, USA (1986)
  28. Park, C.G. Physicochemical characteristics and physiological functionalities of chicor (Cichorium intybus L.) by different roasting processes. Ph.D. disseration, Kyungsang Univ., Jinju (1999)
  29. Oh, S.M., Jeong, H.J., Kwon, S.T. Studies on increase of aroma and establishment of processing system in Codonopsis lanceolata. Report of Ministry of Agriculture and Forestry