Texture and Storage Stability of Tofu Incorporated with Rhynchosia volubilis

  • Lee, Jun-Ho (Department of Food Science and Engineering, Daegu University) ;
  • Ahn, Mi-Jung (Department of Food Science and Engineering, Daegu University)
  • Published : 2009.03.31


The effects of Rhynchosia volubilis (yakong) incorporation (0%, 10%, 20%, and 30%, w/w of soybeans) on quality and shelf life of tofu were investigated. Moisture content of tofu increased slightly with the increase in the level of yakong incorporation from 10% to 30% and no apparent relationships between yakong incorporation and the yield were found. Turbidity of soybean whey tended to increase with increased level of yakong incorporation where the values of 20% and 30% samples were significantly different from those of control and 10% sample (p<0.05). The different levels of yakong incorporation were found to have significant influence (p<0.05) on all the color characteristics of tofu. Tofu texture varied with the level of yakong incorporation in consistent pattern; however, there was no significant difference (p>0.05) in most cases. Tofu incorporated with yakong ($10{\sim}30%$) had a shelf life of above at least 1 day longer than that of the control tofu.


  1. Derbyshire E, Wright DJ, Boulter D. 1976. Legumin and vicilin storage protein of legume seeds. J Phytochem 15: 3-24
  2. Anderson JW, Johnstone BM, Cook-Newell MB. 1995. Meta analysis of the effects of soy protein on serum lipids. New Engl J Med 332: 276-282
  3. Prabhakaran MP, Perera CO, Valiyaveettil S. 2006. Effect of different coagulants on the isoflavone levels and physical properties of prepared firm tofu. Food Chem 99: 492-499
  4. Poysa V, Woodrow L. 2002. Stability of soybean seed composition and its effect on soymilk and tofu yield and quality. Food Res Int 35: 337-345
  5. Jung GT, Ju IO, Choi JS, Hong JS. 2000. Preparation and shelf-life of soybean curd coagulated by fruit juice of Schizandra chinensis RUPRESHT (Omija) and Prunus mume (maesil). Korean J Food Sci Technol 32: 1087-1092
  6. Park LY, Kim SJ, Lee SH. 2007. Effect of surface treatment with chitosan on shelf-life of soybean tofu. Korean J Food Preserv 12: 516-521
  7. Jeon MK, Kim M. 2006. Studies on storage characteristics of tofu with herb. Korean J Food Cookery Sci 22: 307-313
  8. Han MR, Kim MH. 2007. Quality characteristics and storage improvement studies of Rubus coreanus added soybean curd. Food Eng Prog 11: 167-174
  9. Lee YT. 2007. Quality characteristics and antioxidative activity of soybean curd containing small black soybean. Korea Soybean Digest 24: 14-22
  10. Jung BM, Shin TS, Kim DW, Chong KW. 2008. Physicochemical quality characteristics of tofu prepared with mesangi (Capsosphon Fulvescens) powder. Korean J Food Cookery Sci 24: 691-698
  11. Seog EJ, Kim HR, Lee JH. 2008. Physical characteristics and consumer acceptance of tofu as influenced by water dropwort. J Food Sci Nutr 13: 117-121
  12. Shin JY, Park LY, Oh YS, Lee SH, Youn KS, Kim SJ. 2008. Inhibition of lipid accumulation in 3T3-L1 adipocytes by extract of chokong, Rhynchosia nulubilis seeds pickled in vinegar. Food Sci Biotechnol 17: 425-429
  13. Kim MJ, Kim KS. 2005. Functional and chemical composition of Hwanggumkong, Yakong and Huktae. Korean J Food Cookery Sci 21: 844-850
  14. AOAC. 2000. Official Methods of Analysis. 17th ed. Association of Official Analytical Chemists, Washington, DC
  15. Han JS, Kim M. 2005. The effect of chitosan on the rheological properties of soymilk and quality characteristics of tofu. J Food Sci Nutr 10: 224-230
  16. Smith AK, Watanabe T, Nash AM. 1960. Tofu from Japanese and United States soybean. Food Technol 14: 332-336
  17. Kim JY, Park GS. 2006. Quality characteristics and shelf-life of tofu coagulated by fruit juice of pomegranate. Korean J Food Culture 21: 644-652
  18. Min YH, Kim JY, Park LY, Lee SH, Park GS. 2007. Physicochemical quality characteristics of tofu prepared with turmeric (Curcuma aromatica Salab.). Korean J Food Cookery Sci 23: 502-510
  19. Kim JS, Choi SY. 2008. Quality characteristics of soybean curd with omija extract. Korean J Food and Nutr 21: 43-50
  20. Kim DH, Kim SD, Kim WJ. 1990. Comparison study of extraction properties of solids, protein, and color pigments of several soybean varieties. J Korean Agric Chem Soc 31: 8-13
  21. Jung JY, Cho EJ. 2002. The effect of green tea powder levels on storage characteristics of tofu. Korean J Soc Food Cookery Sci 18: 129-135
  22. Hwang TI, Kim SK, Park YS, Byoun KE. 2001. Studies on the storage of functional red soybean curd. J Korean Soc Food Sci Nutr 30: 1115-1119
  23. Kim DH, Lee KS. 1992. Effects of coagulants on storage of packed tofu. Korean J Food Sci Technol 24: 92-96
  24. Fukutake M, Takahashi M, Ishida K, Kawamura H, Sugimura T, Wakabayashi K. 1996. Quantification of genistein and genistin in soybeans and soybean products. Food Chem Toxicol 34: 457-461
  25. Wang LJ, Li D, Tatsumi E, Liu ZS, Chen XD, Li LT. 2007. Application of two-stage ohmic heating to tofu processing. Chem Eng Process 46: 486-490
  26. Park KN, Park LY, Kim DG, Park GS, Lee SH. 2007. Effect of turmeric (Curcuma aromatica Salab.) on shelf life of tofu. Korean J Food Preserv 14: 136-141
  27. Kim SJ, Shin TY, Cho MH, Oh YS, Park NY, Lee SH. 2007. Antioxidant activity and isoflavone profile of Rhynchosia nulubilis seeds pickled in vinegar (Chokong). Food Sci Biotechnol 16: 444-450
  28. Baek SH, Kang KH, Choe SN. 1996. Effect of seaweeds added in preparation of tofu. Korean J Food Nutr 9: 529-535
  29. Cai TD, Chang KC, Shih MC, Hou HJ, Ji M. 1997. Comparison of bench and production scale methods for making soymilk and tofu from 13 soybean varieties. Food Res Int 30: 659-668
  30. Karim AA, Sulebele GA, Azhar ME, Ping CY. 1999. Effect of carrageenan on yield and properties of tofu. Food Chem 66: 159-165
  31. Lee SJ, Chung ES, Park GS. 2006. Quality characteristics of tofu coagulated by apricot juice. Korean J Food Cookery Sci 22: 825-831
  32. Kim J, Jeon JR. 2005. Quality characteristics of tofu added with black soybean hull powder. Korean J Food Culture 20: 633-637