Presented at the 35th Annual Meeting of the Institute of Food Technologists, Chicago, Ill., June 8–12, 1975. The mention of company names or trade products does not imply that they are endorsed or recommended by the U.S. Dept. of Agriculture over other firms or similar products not mentioned.
TOASTING AND HEXANE:ETHANOL EXTRACTION OF DEFATTED SOY FLAKES Flavor of Flours, Concentrates and Isolates
Article first published online: 25 AUG 2006
Journal of Food Science
Volume 41, Issue 3, pages 642–646, May 1976
How to Cite
HONIG, D. H., WARMER, K. and RACKIS, J. J. (1976), TOASTING AND HEXANE:ETHANOL EXTRACTION OF DEFATTED SOY FLAKES Flavor of Flours, Concentrates and Isolates. Journal of Food Science, 41: 642–646. doi: 10.1111/j.1365-2621.1976.tb00690.x
- Issue published online: 25 AUG 2006
- Article first published online: 25 AUG 2006
- MS received 7/24/75; revised 10/28/75; accepted 11/5/75.
Flours and protein concentrates, prepared from defatted soybean flakes steamed up to 20 min before or after extraction with hexane:ethanol azeotrope 82/18 v/v, were presented to a 15-member trained taste panel. Flavors and odors were described and rated for intensity on a scale of 1 to 10 where 1 is strong and 10 is bland. Azeotropic extraction for 6 hr by itself significantly affected flavor of flours and of concentrates so that they scored 7.4 and 6.8, respectively, compared to 4.0 for raw, hexane-defatted, soy flour. Toasting after azeotropic extraction raised flavor scores of flours and protein concentrates to 7.9, a value which compares favorably with 8.1 for wheat flour. Toasting is also necessary to inactivate trypsin inhibitors and other antinutritional factors in azeotropio-extracted soybean flakes. A protein isolate from toasted, azeotropio-extracted flakes scored 7.3 compared to 8.0 for sodium caseinata Yields of protein isolates are good if the heatprocessed fiakes are extracted with hot water at 74°C and pH 7.2.