Investigation of some functional and nutritive properties of cereal germ proteins

R. Lasztity, S. Tomoskozi, J. Nagy, T. Bajkai, L. Simon-Sarkadi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Proteins, protein concentrates and isolates were prepared from wheat, rye, barley, rice and maize germs, after defatting with hexane or supercritical carbon dioxide, by alkaline extraction (NaOH, pH=10) and acid precipitation (0.1 mol/l HCl). The chemical composition, amino acid composition and functional properties (emulsifying properties, foam activity and stability, water and oil absorption, solubility) were determined. The digestibility and biological value of protein preparations were also calculated. Protein isolates had a high protein content (75.8 - 94.3%). The oil content was low, except in maize germ protein isolates, obtained after defatting with supercritical carbon dioxide. High digestibility (83 - 90%) and moderate biological value (63 - 75 FAO/WHO index) was characteristic of all isolates. Methionine and cysteine were the limiting amino acids. Maize germ protein isolates showed the best functional properties, being comparable with those of soy protein isolates. Other germ protein isolates also had acceptable properties. No significant differences were observed between the functional properties of isolates prepared after defatting with hexane or supercritical carbon dioxide, except the foaming properties. The latter were adversely affected by supercritical fluid extraction.

Original languageEnglish
Pages (from-to)63-76
Number of pages14
JournalPeriodica Polytechnica: Chemical Engineering
Volume39
Issue number1
Publication statusPublished - 1995

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Proteins
Carbon Dioxide
Carbon dioxide
Hexanes
Hexane
Oils
Amino acids
Amino Acids
Soybean Proteins
Supercritical fluids
Chemical analysis
Methionine
Cysteine
Foams
Solubility
Acids
Water

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Investigation of some functional and nutritive properties of cereal germ proteins. / Lasztity, R.; Tomoskozi, S.; Nagy, J.; Bajkai, T.; Simon-Sarkadi, L.

In: Periodica Polytechnica: Chemical Engineering, Vol. 39, No. 1, 1995, p. 63-76.

Research output: Contribution to journalArticle

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