Consecutive aqueous extractions of wet-milled corn germ cake

G. Kálmán, K. Réczey

Research output: Contribution to journalArticle

Abstract

Corn germ cake is an abundant and inexpensive residue of corn germ pressing. The permanent increase of corn processing - due to the recent growing demand for bioethanol - has resulted in a surplus of this by-product, making it unmarketable as feed. Our goal was to find an alternative way to utilize this by-product. We could successfully extract 86 % of the polysaccharide content of the squeezed germ by using only hot distilled water and 1 % dilute sulphuric acid consecutively. The 14.7 % oil content of the squeezed germ was concentrated to 46.25 % in the remaining solid fraction, which is high enough to be pressed. (Oil content of less than 20 % can only be extracted with organic solvents, which is not attractive for food safety and environmental reasons.) The sterol concentration of this oil was 8200 mg kg-1, which is significantly more than the sterol concentration of commercial germ oils (4500 mg kg-1).

Original languageEnglish
Pages (from-to)221-226
Number of pages6
JournalChemical and Biochemical Engineering Quarterly
Volume22
Issue number2
Publication statusPublished - Jul 16 2008

Keywords

  • Bioethanol
  • Dilute acid treatment
  • Oil extraction
  • Phytosterols
  • Pressed corn germ

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)
  • Process Chemistry and Technology

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