FIELD: construction.
SUBSTANCE: invention claims method of obtaining protein foaming agent involving hydrolysis of raw protein-containing material by alkali, hydrolysate neutralisation to obtain weak alkaline medium, adding iron (II) sulfate to hydrolysate. Casein is used as raw protein-containing material, sodium, potassium or lithium hydroxide is used as alkali, casein hydrolysis is performed for 2-10 hours at 80-99°C, alkaline hydrolysate neutralisation is performed by acid selected out of: sulfuric, hydrochloric or formic acid, and additionally organic solvent in added to hydrolysate stabilised by iron (II) sulfate. Casein, alkali, iron sulfate, organic solvent and water are taken at the following ratio, weight parts: casein 100, alkali 18-23, iron (II) sulfate 15-35, organic solvent 0-30, water 485-495. Invention is elaborated in dependent clauses.
EFFECT: stable foams with expansion rate of 10 or more.
4 cl, 5 tbl, 33 ex
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