Utilization of Soymilk Residue for Wheat Flour Substitution in Gyoza skin

Soymilk residue is obtained as a byproduct from soymilk and tofu production with little economic value. It contains high protein and fiber as well as various minerals and phyto-chemical compounds. The objective of this research was to substitute soymilk residue for wheat flour in gyoza skin in order to enhance value of soymilk residue and increase protein and fiber content of gyoza skin. Wheat flour was replaced with soymilk residue from 0 to 40%. The soy milk residue prepared in this research contains 26.92%protein, 3.58% fiber, 2.88% lipid, 6.29% ash and 60.33% carbohydrate. The results showed that increasing soymilk residue decreased lightness (L*value), tensile strength and sensory attributes but increased redness (a*), yellowness (b*), protein and fiber contents of product. The result also showed that the gyoza skin substituted with 30% soymilk residue was the most acceptable (p≤0.05) and its protein and fiber content increased up to 45 % and 867 % respectively.

• Naruemon Prapasuwannakul

• Gyoza skin
• sensory
• soymilk residue
• wheat flour.

[1] D. K. O’Toole, "Characteristics and Use of Okara, the Soybean Residue from Soy Milk Production-A Review,” J. Agric Food Chem, vol.47, pp.363-371, 1999.
[2] Y. Puechkamut, "Utilization of Soy Milk Residue,” The Journal of KMUTLB , vol. 22, pp. 34-41, 2007.
[3] P. Pattamarungson, K. Laohasongkram, and S. Chaiwanichsiri, " Effect of soy meal on physico-chemical and sensory properties of egg noodles,” in Proc. 33rd Congress on Science and Technology of Thailand,Nakhon Si Thammarat, October 2007. pp. 35-40.
[4] Official methods of analysis, The Association of Official Analytical Chemists (AOAC), ed. 18th. 2005.
[5] M.C. Bourne, M.G. Clemente, and J. Banzon,"Survey of the suitability of thirty cultivars of soybeans for soymilk manufacture,” J. Food Sci., vol. 41, pp. 1204-1208, 1976.
[6] S. K. Khare, K. Jha, and A.P. Gandhi, "Citric acid production from Okara (soy-residue) by solid-state fermentation,” Bioresour. Technol., vol. 54, pp.323-325, 1995.
[7] M. Yunchalad, U. Phawsungthong, D. Hengasawadi, C. Hiraga, and K. Trongpanich, "Feasibility study on production of dietary fiber from soymilk residue,” Institute of Food Research and Product Development., pp. 150-151, 2000.
[8] C. Hsieh and F. C. Yang, "Reusing soy residue for the solid-state fermentation of Ganoderma lucidum,” Bioresour. Technol., vol. 91, pp. 105-109, 2004.
[9] T. Cai and K. C. Chang, "Processing effect on soybean storage proteins and their relationship with tofu quality,” J. Agri. Food Chem., vol. 47, pp. 720-727, 1999.
[10] J. Fu, S.J. Mulvaney, and C. Cohen, 1997. "Effect of added fat on the rheological properties of wheat flour doughs,”. Cereal Chem., vol.74, pp.304-311, 1997.