United States Department of Agriculture
Agricultural Research Service

National Nutrient Database for Standard Reference Release 28
Statistics Report:  16126, Tofu, firm, prepared with calcium sulfate and magnesium chloride (nigari) a 
heading Nutrient Unit Value (100g) Data Points Std. Error Min Max df LB UB # Studies Source NDB Ref Last Modified
Proximates Water 1 g 82.93 10 0.985 71.1 86.14 1.0 72.054 93.81 4 Aggregated data involving combinations of source codes 1 &12 -- 08/2015
Proximates Energy kcal 78 -- -- -- -- -- -- -- -- Calculated or imputed -- 08/2015
Proximates Energy kJ 326 -- -- -- -- -- -- -- -- Calculated or imputed -- 08/2015
Proximates Protein 1 g 9.04 4 0.225 8.56 9.5 3.0 8.324 9.757 1 Analytical or derived from analytical -- 07/2015
Proximates Total lipid (fat) 1 g 4.17 7 0.120 3.42 4.46 4.0 3.84 4.509 2 Analytical or derived from analytical -- 12/2003
Proximates Ash 1 g 1.01 7 0.069 0.79 1.29 4.0 0.815 1.2 2 Analytical or derived from analytical -- 12/2003
Proximates Carbohydrate, by difference g 2.85 -- -- -- -- -- -- -- -- Calculated or imputed -- 08/2015
Proximates Fiber, total dietary g 0.9 5 0.020 0.4 2.3 1.0 0.626 1.134 3 Aggregated data involving combinations of source codes 1 &12 -- 05/2004
Proximates Sugars, total g 0.60 1 -- -- -- -- -- -- -- Analytical or derived from analytical -- 11/1997
Minerals Calcium, Ca 1 b mg 201 7 26.326 127 306 4.0 127.693 273.878 2 Analytical or derived from analytical -- 12/2003
Minerals Iron, Fe 1 mg 1.61 7 0.131 1.29 2.35 4.0 1.249 1.977 2 Analytical or derived from analytical -- 12/2003
Minerals Magnesium, Mg 1 b mg 37 5 1.971 32 46 4.0 31.628 42.572 2 Analytical or derived from analytical -- 12/2003
Minerals Phosphorus, P 1 mg 121 6 5.846 92 147 4.0 104.901 137.366 2 Analytical or derived from analytical -- 12/2003
Minerals Potassium, K 1 mg 148 7 8.812 99 176 4.0 123.248 172.181 2 Analytical or derived from analytical -- 12/2003
Minerals Sodium, Na 1 mg 12 7 3.706 3 30 4.0 1.677 22.257 2 Analytical or derived from analytical -- 12/2003
Minerals Zinc, Zn 1 mg 0.83 6 0.029 0.7 1.01 4.0 0.747 0.906 2 Analytical or derived from analytical -- 12/2003
Minerals Copper, Cu 1 mg 0.213 6 0.010 0.16 0.24 4.0 0.184 0.241 2 Analytical or derived from analytical -- 12/2003
Minerals Manganese, Mn 1 mg 0.625 6 0.037 0.51 0.73 4.0 0.521 0.728 2 Analytical or derived from analytical -- 12/2003
Minerals Selenium, Se 1 µg 9.9 6 2.075 4 15 4.0 4.105 15.628 2 Aggregated data involving comb. of codes other then 1,12 or6 -- 12/2003
Vitamins Vitamin C, total ascorbic acid mg 0.2 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 12/1986
Vitamins Thiamin 1 mg 0.060 6 0.009 0.03 0.09 4.0 0.036 0.084 2 Analytical or derived from analytical -- 12/2003
Vitamins Riboflavin 1 mg 0.063 6 0.004 0.04 0.1 4.0 0.052 0.075 2 Analytical or derived from analytical -- 12/2003
Vitamins Niacin 1 mg 0.101 6 0.031 0.01 0.25 4.0 0.014 0.188 2 Analytical or derived from analytical -- 12/2003
Vitamins Pantothenic acid 1 mg 0.110 4 0.009 0.07 0.15 2.0 0.071 0.148 2 Analytical or derived from analytical -- 12/2003
Vitamins Vitamin B-6 1 mg 0.071 6 0.008 0.05 0.09 4.0 0.049 0.094 2 Analytical or derived from analytical -- 12/2003
Vitamins Folate, total 1 µg 19 6 3.496 8 33 4.0 9.159 28.574 2 Analytical or derived from analytical -- 12/2003
Vitamins Folic acid µg 0 -- -- -- -- -- -- -- -- Assumed zero -- 01/2001
Vitamins Folate, food µg 19 6 3.496 8 33 4.0 9.159 28.574 2 Analytical or derived from analytical -- 03/2006
Vitamins Folate, DFE µg 19 -- -- -- -- -- -- -- -- Calculated or imputed -- 03/2006
Vitamins Choline, total 3 mg 28.1 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Vitamins Betaine 3 mg 0.4 1 -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Vitamins Vitamin B-12 µg 0.00 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 12/1986
Vitamins Vitamin A, RAE µg 0 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Vitamins Retinol µg 0 -- -- -- -- -- -- -- -- Assumed zero -- 06/2002
Vitamins Carotene, beta 2 µg 0 2 -- -- -- -- -- -- -- Analytical or derived from analytical -- 07/2003
Vitamins Carotene, alpha 2 µg 0 2 -- -- -- -- -- -- -- Analytical or derived from analytical -- 07/2003
Vitamins Cryptoxanthin, beta 2 µg 0 2 -- -- -- -- -- -- -- Analytical or derived from analytical -- 07/2003
Vitamins Vitamin A, IU IU 0 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 09/2015
Vitamins Lycopene µg 0 -- -- -- -- -- -- -- -- Calculated or imputed 16127 03/2006
Vitamins Lutein + zeaxanthin µg 0 -- -- -- -- -- -- -- -- Calculated or imputed 16127 12/2003
Vitamins Vitamin E (alpha-tocopherol) mg 0.01 -- -- -- -- -- -- -- -- Calculated or imputed 16127 03/2006
Vitamins Vitamin D (D2 + D3) µg 0.0 -- -- -- -- -- -- -- -- Assumed zero -- 11/2008
Vitamins Vitamin D IU 0 -- -- -- -- -- -- -- -- Assumed zero -- 02/2009
Vitamins Vitamin K (phylloquinone) µg 2.4 -- -- -- -- -- -- -- -- Calculated or imputed 16127 03/2006
Lipids Fatty acids, total saturated g 0.793 3 0.068 0.65 0.93 2.0 0.499 1.088 2 Aggregated data involving comb. of codes other then 1,12 or6 -- 07/2015
Lipids 8:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 10:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 12:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 13:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 14:0 1 g 0.013 3 0.003 0.01 0.02 2.0 -0.001 0.028 2 Analytical or derived from analytical -- 07/2015
Lipids 15:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 16:0 1 g 0.567 3 0.067 0.47 0.7 2.0 0.28 0.854 2 Analytical or derived from analytical -- 07/2015
Lipids 17:0 1 g 0.013 3 0.003 0.01 0.02 2.0 -0.001 0.028 1 Analytical or derived from analytical -- 07/2015
Lipids 18:0 1 g 0.200 3 0.000 0.16 0.2 -- -- -- 2 Analytical or derived from analytical -- 07/2015
Lipids 20:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 22:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 24:0 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids Fatty acids, total monounsaturated g 1.127 3 0.154 0.88 1.41 2.0 0.466 1.788 2 Aggregated data involving comb. of codes other then 1,12 or6 -- 07/2015
Lipids 14:1 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 15:1 1 g 0.067 3 0.042 0.02 0.15 2.0 -0.113 0.246 1 Analytical or derived from analytical -- 07/2015
Lipids 16:1 undifferentiated 1 g 0.000 3 0.000 0 0.01 -- -- -- 2 Analytical or derived from analytical -- 03/2006
Lipids 17:1 1 g 0.023 3 0.003 0.02 0.03 2.0 0.009 0.038 1 Analytical or derived from analytical -- 07/2015
Lipids 18:1 undifferentiated 1 g 1.007 3 0.107 0.81 1.18 2.0 0.547 1.466 2 Analytical or derived from analytical -- 07/2015
Lipids 20:1 1 g 0.023 3 0.013 0.01 0.05 2.0 -0.034 0.081 1 Analytical or derived from analytical -- 07/2015
Lipids 22:1 undifferentiated 1 g 0.007 3 0.003 0 0.01 2.0 -0.008 0.021 1 Analytical or derived from analytical -- 03/2006
Lipids Fatty acids, total polyunsaturated g 1.649 3 0.413 0.83 2.52 2.0 -0.13 3.428 2 Aggregated data involving comb. of codes other then 1,12 or6 -- 07/2015
Lipids 18:2 undifferentiated 1 g 1.469 3 0.363 0.75 2.22 2.0 -0.093 3.031 2 Analytical or derived from analytical -- 07/2015
Lipids 18:3 undifferentiated 1 g 0.167 3 0.059 0.05 0.3 2.0 -0.087 0.42 2 Analytical or derived from analytical -- 07/2015
Lipids 20:2 n-6 c,c 1 g 0.003 3 0.003 0 0.01 2.0 -0.011 0.018 1 Analytical or derived from analytical -- 07/2015
Lipids 20:3 undifferentiated 1 g 0.000 3 0.000 0 0 -- -- -- 1 Analytical or derived from analytical -- 03/2006
Lipids 20:4 undifferentiated 1 g 0.003 3 0.003 0 0.01 2.0 -0.011 0.018 1 Analytical or derived from analytical -- 07/2015
Lipids Fatty acids, total trans g 0.000 -- -- -- -- -- -- -- -- Assumed zero -- 08/2015
Lipids Cholesterol mg 0 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 12/1986
Amino Acids Tryptophan 1 g 0.123 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Threonine 1 g 0.411 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Isoleucine 1 g 0.444 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Leucine 1 g 0.728 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Lysine 1 g 0.462 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Methionine 1 g 0.110 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Cystine 1 g 0.030 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Phenylalanine 1 g 0.437 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Tyrosine 1 g 0.367 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Valine 1 g 0.455 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Arginine 1 g 0.716 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Histidine 1 g 0.225 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Alanine 1 g 0.405 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Aspartic acid 1 g 1.066 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Glutamic acid 1 g 1.721 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Glycine 1 g 0.384 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Proline 1 g 0.567 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Amino Acids Serine 1 g 0.531 -- -- -- -- -- -- -- -- Analytical or derived from analytical -- 03/2006
Other Alcohol, ethyl g 0.0 -- -- -- -- -- -- -- -- Assumed zero -- 03/2006
Other Caffeine mg 0 -- -- -- -- -- -- -- -- Assumed zero -- 03/2006
Other Theobromine mg 0 -- -- -- -- -- -- -- -- Assumed zero -- 03/2006
Flavones Luteolin 4 mg 0.0 1 -- 0 0 -- -- -- -- -- --
Flavonols Kaempferol 4 mg 1.2 1 -- 1.19 1.19 -- -- -- -- -- --
Flavonols Myricetin 4 mg 0.0 1 -- 0 0 -- -- -- -- -- --
Flavonols Quercetin 4 b mg 0.0 1 -- 0 0 -- -- -- -- -- --
Isoflavones Daidzein 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 mg 12.31 105 4.72 0.9 48.59 -- -- -- -- -- --
Isoflavones Genistein 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 mg 16.10 108 7.7 2.22 81.51 -- -- -- -- -- --
Isoflavones Glycitein 5, 6, 9, 10, 12, 15, 16, 17, 18, 19, 21, 23 mg 2.75 70 1.28 0.57 12.2 -- -- -- -- -- --
Isoflavones Total isoflavones 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 mg 30.41 105 13.3 3.12 142.3 -- -- -- -- -- --
Isoflavones Biochanin A mg 0.00 6 0 0 0 -- -- -- -- -- --
Isoflavones Formononetin mg 0.00 2 -- 0 0 -- -- -- -- -- --
Isoflavones Coumestrol mg 0.11 2 -- 0 0.23 -- -- -- -- -- --

Sources of Data

1Nutrient Data Laboratory, ARS, USDA National Food and Nutrient Analysis Program Wave 0 , 1998  Beltsville MD  
2Nutrient Data Laboratory, ARS, USDA Nutrient content of ethnic and geographic specific foods, Southern Testing and Research Laboratories , 1995  Beltsville MD  
3Nutrient Data Laboratory, ARS, USDA Choline Study, Local pickup UNC, NFNAP , 2003  Beltsville MD  
4Arai, Yusuke, Watanabe, S., Kimira, M., Shimoi, K., Mochizuki, R., and Kinae, N. Dietary intakes of flavonols and isoflavones by Japanese women and inverse correlation between quercetin intake and plasma LDL cholesterol concentration , 2000 J. Nutr. 130   pp.2243-2250
5Coward, L., Smith, M., Kirk, M., and Barnes, S. Chemical modification of isoflavones in soyfoods during cooking and processing. , 1998 Am. J. Clin. Nutr. 68(S)   pp.1486S-1491S
6Franke, A. A., Hankin, J. H., Yu, M. C., Maskarinec, G., Low, S-H., and Custer, L. Isoflavone levels in soy foods consumed by multiethnic populations in Singapore and Hawaii. , 1999 J. Agric. Food Chem. 47   pp.977-986
7Horn-Ross, P. L., Barnes, S., Lee, M., Coward, L., Mandel, E., Koo, J., John, E. M., and Smith, M. Assesing phytoestrogen exposure in epidemiologic studies: development of a database (United States). , 2000 Cancer Causes and Control 11   pp.289-298
8Hutabarat, L. S., Greenfield, H., and Mulholland, M. Isoflavones and coumestrol in soybeans and soybean products from Australia and Indonesia. , 2001 J. Food Comp. Anal. 14   pp.43-58
9Huang, T-C., Fu, H-Y., and Ho, C-T. Comparative studies on some attributes of firm tofu sterilized with traditional and autoclaving methods. , 2003 J. Agric. Food Chem. 51   pp.254-259
10King, R. A., and Bignell, C. M. Concentrations of isoflavone phytoestrogens and their glucosides in Australian soya beans and soya foods. , 2000 Aust. J. Nutr. Diet. 57   pp.70-78
11Kao, F-J., Su, N-W., and Lee, M-H. Effect of water-to-bean ratio on the contents and compositions of isoflavones in tofu. , 2004 J. Agric. Food Chem. 52   pp.2277-2281
12Murphy, P. A., Barua, K., and Hauck, C. C. Solvent extraction selection in the determination of isoflavones in soy foods. , 2002 J. Chromatogr. B 777   pp.129-138
13Mitani, K., Narimatsu, S., and Kataoka, H. Determination of daidzein and genistein in soybean foods by automated on-line in-tube solid-phase microextraction coupled to high-performance liquid chromatography. , 2003 J. Chromatogr. A 986   pp.169-177
14Müllner, C. and Sontag, G. Determination of some phytoestrogens in soybeans and their processed products with HPLC and coulometric electrode array detection. , 1999 Fresnius J. Anal. Chem. 363   pp.261-265
15Nakamura, Y., Tsuji, S., and Tonogai, Y. Determination of the levels of isoflavonoids in soybeans and soy-derived foods and estimation of isoflavonoids in the Japanese daily intake. , 2000 J. AOAC Int. 83   pp.638-650
16Preinerstorfer, B. and Sontag, G. Determination of isoflavones in commercial soy products by HPLC and coulometric electrode array detection. , 2004 Eur. Food Res. Technol. 219   pp.305-310
17Prabhakaran, M. P., Perera, C. O, and Valiyaveettil, S. Quantification of isoflavones in soymilk and tofu from South East Asia. , 2005 Int. J. Food Properties 8   pp.113-123
18Toda, T., Sakamoto, A., Takayanagi, T., and Yokotsuka, K. Changes in isoflavone composition of soybean foods during cooking process. , 2000 Food Sci. Technol. Res. 6   pp.314-319
19Yin, L-J., Li, L-T., Li, Z-G., Tatsumi, E., and Saito, M. Changes in isoflavone contents and composition of sufu (fermented tofu) during manufacturing. , 2004 Food Chem. 87   pp.587-592
20Dwyer, J. T., Goldin, B. R., Saul, N., Gualtieri, L., Barakat, S. and Adlercreutz, H Tofu and soy drinks contain phytoestrogens. , 1994 J. Am. Diet. Assoc. 94   pp.739-743
21Franke, A. A., Custer, L. J., Wang, W., and Shi, C. Y. HPLC analysis of isoflavonoids and other phenolic agents from foods and from human fluids. , 1998 Proc. Soc. Exp. Biol. Med. 217   pp.263-273
22Wang, G., Kuan, S. S., Francis, O. J., Ware, G. M., and Carman, A. S. A simplified HPLC method for the determination of phytoestrogens in soybean and its processed products. , 1990 J. Agric. Food Chem. 38   pp.185-190
23Murphy, P. A., Song. T., Buseman, G., Barua, K., Beecher, G. R., Trainer, D., and Holden, J. Isoflavones in retail and institutional soy foods. , 1999 J. Agric. Food Chem. 47   pp.2697-2704
24Fukutake, M., Takahashi, M., Ishida, K., Kawamura, H., Sugimura, T., and Wakabayashi, K. Quantification of genistein and genistin in soybeans and soybean products. , 1996 Food and Chemical Toxicology 34   pp.457-461

Footnotes

a  Descriptive terms (soft, firm, extra firm) vary in usage between manufacturers as there are no standards for the various types of tofu.
b  Manufacturers use either magnesium chloride (nigari), calcium sulfate, or both in varying quantities to precipitate the protein. Calcium and magnesium contents will vary accordingly.
b  Manufacturers use either magnesium chloride (nigari), calcium sulfate, or both in varying quantities to precipitate the protein. Calcium and magnesium contents will vary accordingly.