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Properties of fibers produced from soy protein isolate by extrusion and wet‐spinning
Author(s) -
Huang H. C.,
Hammond E. G.,
Reitmeier C. A.,
Myers D. J.
Publication year - 1995
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02577837
Subject(s) - glutaraldehyde , spinning , extrusion , hydrochloric acid , acetic anhydride , soy protein , acetic acid , materials science , ultimate tensile strength , tenacity (mineralogy) , composite material , chemistry , chemical engineering , nuclear chemistry , chromatography , organic chemistry , biochemistry , metallurgy , engineering , catalysis
Fibers were produced from soy protein isolate by both wet‐spinning and extrusion. In the wet‐spinning process, aged, alkaline protein solution was forced through a spinnerette into an acid coagulating bath. In the extrusion process, a twinscrew extruder forced a protein isolate‐water mixture through a die. The physical properties of the fibers were measured at various water activities. The fibers produced by both methods were brittle and lacked tensile strength (tenacity). The addition of glycerol reduced brittleness in extruded fibers. Zinc and calcium ions decreased the brittleness of wet‐spun fibers. The tenacity of soy fibers was significantly improved by post‐spinning treatments, including acetic anhydride, acetaldehyde, glyoxal, glutaraldehyde, a combination of glutaraldehyde and acetic anhydride, and stretching. The best extruded fibers were produced with a mixture of 45% soy protein, 15% glycerol, and 40% water, finished with a combination of glutaraldehyde and acetic anhydride and then stretched to 150% their original lengths. The best wet‐spun fibers were produced with a 19.61% soy protein suspension at pH 12.1; coagulated in a 4% hydrochloric acid solution that contained 3.3% sodium chloride, 3.3% zinc chloride, and 3.3% calcium chloride; and followed by treatment with 25% glutaraldehyde and stretching to 170% their original lengths.