Full-fat soybeans require heat treatment to denature trypsin inhibitors which interfere with proper digestion of the soybean protein. This study examines the heat treatment of soybeans in a continuous particulate-medium conduction processor. / Whole soybeans at 13% and 23% moisture were roasted at salt temperatures of 225, 250 and 275$ sp circ$C for residence times of 15, 30 and 60 seconds. The soybeans reached temperatures ranging from 107$ sp circ$C to 134$ sp circ$C, after which they were maintained in an insulated container for 0, 5, 10 or 15 minutes. Salt temperature, residence time, and moisture content were found to significantly affect final temperature, temperature change, moisture loss and total heat transfer. Moisture losses in the processor were very high, indicating that combining the processes of heat treatment and drying may provide a high combined efficiency. / Analysis of trypsin inhibitor activity and soluble protein indicated that all three factors likely affect soybean quality, and the soybean quality achieved in these tests is likely to be sufficient for livestock feeding, although this remains to be confirmed through feeding trials.

Levels of soybean trypsin inhibitors (SBTI) in soy-based infant formulas were measured and found to range from 3 to 28% of the activity measured in raw soybeans, with higher activity usually present in ready-to-feed compared to concentrate or powder formulations. Experiments were conducted to examine the influence of dietary SBTI on growth, serum enzyme, lipid and free amino acids and hepatic S-adenosylmethionine (SAM) status in weanling male rats. Diets containing graded amounts of SBTI were fed with and without the methionine antagonist ethionine. Changes in growth, serum enzymes, lipid and amino acid parameters in rats fed SBTI or ethionine indicated lipotrope deficit and compromise of the transsulfuration pathway. The combination of SBTI and ethionine exacerbated many of the symptoms and methyl donor deficit was indicated by hepatic SAM status. Methionine supplementation of SBTI + ethionine diets was beneficial at moderating changes while cysteine supplementation was not.

No description available.

No description available.

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 183-192). Also available on the Internet.

Thesis--Lund. / Extra t.p. with thesis statement inserted.

Thesis--Lund. / Extra t.p. with thesis statement inserted.

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 183-192). Also available on the Internet.

Thesis (M.S.)--University of Puerto Rico, Mayagüez Campus, 2004. / Printout. Tables. Includes bibliographical references (leaves 27-29).

No description available.