Heat Induced Gels from Coconut Press Cake Proteins

Research output: Contribution to journalArticle

Abstract

Freeze-dried coconut press cake powder (CPP), 43% w/w protein, was used to investigate the heat-induced gelation by heating in rheometer to 75℃ in a wide range of pH values, from 4 to 9. Low strain oscillatory method applied the measure visco-elastic propertieson 15% w/w CPP. The gel strength was also assessed by a texture analyzer. SDS-PAGE electrophoresis was conducted to identify the proteins evolved in the gel network structure and the gel micro-structure was also evaluated. At low pH, the CPP proteins formed soft (elastic modulus <100 Pa) particulate gels prone to syneresis, with aggregate size of the order of 4.2 micrometers. In the alkaline region, homogenous gels were induced by heating. Gel strength started to increase dramatically from 64℃ to 67℃, for pH 9 and pH 8 respectively, reaching the maximum gel elastic modulus over 1000 Pa at pH 9. The SDS-PAGE showed that the polypeptide sub-unities at 24, 32 - 34 and 53 kDa were the most prominent in gelation.

Details

Authors
Organisations
External organisations
  • Eduardo Mondlane University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Food Engineering
Original languageEnglish
Pages (from-to)562-570
Number of pages8
JournalFood and Nutrition Sciences
Volume5
Issue number6
Publication statusPublished - 2014 Mar 13
Publication categoryResearch
Peer-reviewedYes