Physicochemical Properties of Defatted Rambutan (Nephelium lappaceum) Seed Flour after Alkaline Treatment

Molecules. 2016 Mar 31;21(4):364. doi: 10.3390/molecules21040364.


Rambutan seeds were subjected to SC-CO₂ extraction at 35 MPa, 45 °C to obtain defatted rambutan seed flour. Its physicochemical properties before and after treatment with alkali solution using 0.075 N NaOH were investigated. Alkali-treated flour had a significant increment in bulk density, swelling power, water adsorption capacity, emulsion capacity and stability but a reduction in turbidity, solubility and oil absorption capacity. Pasting measurements showed peak viscosity, breakdown, setback and final viscosity increased significantly for the alkali-treated flour, while pasting temperature decreased. The alkaline treatment decreased the least gelation concentration, but increased the apparent viscosity.

Keywords: Rambutan (Nephelium lappaceum); alkali treatment; flour; physicochemical properties.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Alkalies / chemistry
  • Dietary Fiber
  • Emulsions
  • Flour*
  • Plant Extracts / chemistry*
  • Sapindaceae / chemistry*
  • Seeds / chemistry*
  • Solubility
  • Viscosity
  • Water / chemistry


  • Alkalies
  • Dietary Fiber
  • Emulsions
  • Plant Extracts
  • Water