Purification of antifreeze protein from wheat bran (Triticum aestivum L.) based on its hydrophilicity and ice-binding capacity

J Agric Food Chem. 2007 Sep 19;55(19):7654-8. doi: 10.1021/jf0715065. Epub 2007 Aug 23.

Abstract

Wheat-bran ( Triticum aestivum L.) antifreeze protein ( TaAFP) was purified 323-fold to electrophoretic homogeneity with an overall yield of 1.64% from wheat-bran protein by a specific three-step procedure. The three-step procedure was quicker, cheaper, and more effective than the five-step procedure we used earlier. First, TaAFP was concentrated by a phosphate buffer, on the basis of its strong hydrophilicity that was validated by thermal gravimetric analyses and a surface hydrophobicity analysis. Second, TaAFP was trapped in ice crystals for its specific ice-binding capacity, which was proved by ice-binding protocols. Remarkably, the ice-binding step was the most effective step, and the purification factor of this step was up to 270-fold. Finally, TaAFP was purified by HPLC purification, a complementary step for the specific ice-binding protocol, to electrophoretic homogeneity. Our protocols provide peers a novel and effective way for the search and purification of potential AFPs.

MeSH terms

  • Antifreeze Proteins / chemistry*
  • Antifreeze Proteins / isolation & purification*
  • Chemical Phenomena
  • Chemistry, Physical
  • Chromatography, High Pressure Liquid
  • Dietary Fiber / analysis*
  • Hydrophobic and Hydrophilic Interactions
  • Ice*
  • Plant Proteins / chemistry
  • Plant Proteins / isolation & purification

Substances

  • AFP protein, Daucus carota
  • Antifreeze Proteins
  • Dietary Fiber
  • Ice
  • Plant Proteins