Sains Malaysiana 39(6)(2010): 963–968

Ciri-ciri Fiziko-Kimia dan Sensori Tauhu Telur Komersial

(Physico-chemical Properties and Sensory of Commercial Egg Tofu)

Maizura Murad, Aminah Abdullah* &Wan Aida Wan Mustapha

Program Sains Makanan

Pusat Pengajian Sains Kimia dan Teknologi Makanan

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor D.E., Malaysia

Diserahkan: 2 September 2009 / Diterima: 2 Februari 2010

ABSTRAK

Analisis ke atas ciri-ciri fiziko-kimia dan penilaian sensori untuk lima jenama tauhu telur komersial telah dijalankan. Kandungan lembapan, kandungan protein dan kandungan lemak untuk lima jenama tauhu telur adalah antara 85.2 – 87.0%, 5.9 – 8.7% dan 3.7 – 4.6% setiap satu. Nilai pH tauhu telur pula adalah antara 6.2 – 7.1. Keputusan menunjukkan bahawa tidak terdapat perbezaan bererti (P>0.05) yang dilihat untuk nilai sineresis (2.2-2.6%) bagi kesemua jenama tauhu telur. Setiap jenama mempamerkan kecerahan warna yang berbeza secara bererti (p<0.05) mengikut urutan: Jenama D < Jenama A < Jenama E < Jenama C < Jenama B. Tauhu telur jenama E mempunyai tekstur yang paling keras iaitu 31.35 N, manakala jenama D pula mempunyai tekstur yang paling lembut iaitu 5.38 N. Keputusan penilaian sensori secara nyata menunjukkan bahawa ahli panel menyukai atribut rupabentuk, warna, aroma, rasa, tekstur (kelembutan) dan penerimaan keseluruhan tauhu telur jenama A, D dan E berbanding jenama B dan C.

Kata kunci: Analisis fiziko-kimia; penilaian sensori; tauhu telur

ABSTRACT

Analysis on the physico-chemical properties and sensory evaluation of five brands of comercial egg tofu was conducted. The moisture, protein and fat content of the five egg tofu brands were 85.2 – 87.0%, 5.9 – 8.7% dan 3.7 – 4.6%, respectively. The pH value was between 6.2 – 7.1. Results showed that there was no significant different (P>0.05) in sineresis (2.2-2.6%) value was observed for all egg tofu brands. Each brand had significantly different in color lightness in the order: Brand D < Brand A < Brand E < Brand C < Brand B. Brand E egg tofu had the hardess texture which is 31.35 N, meanwhile brand D had the softess texture which is 5.58 N. Results on sensory evaluation obtained clearly showed that the panelists prefer the attribute of appearence, color, aroma, taste, texture (softness) and overall acceptability egg tofu brands A, D and E compared to brands B and C.

Keywords: Egg tofu; physico-chemical analysis; sensory evaluation

RUJUKAN

Aminah, A. 2000. Prinsip Penilaian Sensori. Bangi. Penerbit UKM.

AOAC 1990. Methods of Analysis: 15th Ed. Washington: Association of Official Agricultural Chemistry.

Han, B.Z., Rombouts, F.M. & Nout, M.J.R. 2004. Amino acid profiles of sufu, a Chinese fermented soybean food. Journal of Food Composition and Analysis 17: 689-698.

Jung, S., Murphy, P.A. & Sala, I. 2008. Isoflavone profiles of soymilk as affected by high-pressure treatments of soymilk and soybeans. Food Chemistry 111: 592-598.

Karim, A.A., Solebele, G.A., Azhar, M.E. & Ping, C.Y. 1999. Effect of carrageenan on yield and properties of tofu. Food Chemistry 66:159-165.

Kim, Y.S., Choi, Y.M., Noh, D.O., Cho, S.Y. & Suh, H.J. 2007. The effect of oyster powder on the extension of the shelf life of tofu. Food Chemistry 103:155-160.

Liu, Z.S., Chang, S.K., Li, L.T. & Tatsumi, E. 2004. Effectof selective thermal denaturation of soybean proteins on soymilk viscosity and tofu’s physical properties. Food Research International 37: 815-822.

Noh, E.J., Park, S.Y., Pak, J.I., Hong, S.T. &Yun, S.E. 2005. Coagulation of soymilk and quality of tofu as affected by freeze treatment of soybeans. Food Chemistry 91: 715-721.

Plancken, L.V.D., Loey, A.V. & Hendrickx, M.E. 2006. Effect of heat-treatment on the physico-chemical properties of egg white proteins: A kinetic study. Journal of Food Engineering 75: 316-326.

Potter, S.M., Baum, J.A. Teng, H.Y., Stillman, Shay, R.J. & Erdman, J.W. 1998. Soy protein and isoflavones: their effects on blood lipids and bone density in postmenopausal women. American Journal of Clinical Nutrition 68: 1375s-13759s.

Poysa, V. & Woodrow, L. 2002. Stability of soybean seed composition and its effect on soymilk and tofu yield and quality. Food Research International 35: 337-345.

Prabhakaran, M.P., Perera, C.O. & Valiyaveettil, S. 2006. Effect of different coagulants on the isoflavone levels and physical properties of prepared firm tofu. Food Chemistry 99: 492-499.

Siti Aisyah. 2009. Tauhu: Kompilasi Majalah Karangkraf. Malaysia: Buku Prima Sdn Bhd.

Sun, N. & Breene, W. M. 1991. Calcium sulphate concentration influence on yield and quality of tofu from five soybean varieties. Journal of Food Science 56(6): 1604-1607.

Tee, E.S., Mohd Ismail, N., Mohd Nasir, A. & Katijah, I. 1997. Nutrient composition of Malaysian Foods. Kuala Lumpur: Institute for Medical Research.

Tsai, S.J., Lan, C.Y., Kao, C.S. & Chen, S.C. 1981. Studies on the yield and quality characteristics of tofu. Journal of Food Science 46: 1734-1740.

Tseng, Y.C. & Xiong, Y.L. 2009. Effect of inulin on the rheological properties of silken tofu coagulated with glucono-δ-lactone. Journal of Food Engineering 90: 511-516.

Wang, H.L. & Hesseltine, C.W. 1982. Coagulation conditions in tofu processing. Process Biochemistry Jan/Feb, 7-12.

Watt, B.K. & Merrill, A.L. 1975. Handbook of the Nutritional Content of Foods. New York: Dover Publications, Inc.

Yuan, S. & Chang, S.K.C. 2007. Texture profile of tofu as affected by instron parameters and sample preparation, and correlations of instron hardness and springiness with sensory scores. Journal of Food Science 72(2): S136-S145.

Zhang, E.J., Ng, K.M. & Luo, K.Q. 2007. Extraction and purification of isoflavones from soybeans and characterization of their estrogenic activities. Journal of Agricultural and Food Chemistry 55: 6940-6950.

*Pengarang untuk surat-menyurat; email: aminahsens@yahoo.com