Moisture absorption and dynamic flavor changes in hydrolysed and freeze-dried pine nut (Pinus koraiensis) by-products during storage

Food Res Int. 2018 Jan:103:243-252. doi: 10.1016/j.foodres.2017.10.016. Epub 2017 Oct 12.

Abstract

In the present study, two different fractions of pine nut (Pinus koraiensis) protein hydrolysate powder (PNPHP1-3kDa and PNPHP3-10kDa) were prepared and stored for fifteen days at 25°C and 50% relative humidity. Changes in moisture absorption, secondary structure and flavor compounds were measured at various time intervals over fifteen days. Results showed that the PNPHP3-10kDa had higher moisture absorption capacity from day 6 to day 15 and that the secondary structure of two PNPHP fractions was changed. Major nine and eight flavor compounds were identified from PNPHP1-3kDa and PNPHP3-10kDa, respectively. PNPHP1-3kDa mainly generated aldehydes and PNPHP3-10kDa generated pyrazines. Finally, the formation of pyrazines was conjectured. The data suggests that Maillard reaction, microbial fermentation and lipid oxidation occurred during storage. The reactions appeared to be strongest by the sixth day.

Keywords: Flavor compounds; Moisture absorption; Pine nut protein hydrolysate powder; Storage process.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Absorption, Physicochemical
  • Fermentation
  • Food Analysis / methods*
  • Food Handling / methods*
  • Food Storage / methods*
  • Freeze Drying*
  • Gas Chromatography-Mass Spectrometry
  • Humidity
  • Maillard Reaction
  • Nuts / chemistry*
  • Nuts / microbiology
  • Oxidation-Reduction
  • Pinus / chemistry*
  • Pinus / microbiology
  • Powders
  • Protein Hydrolysates / chemistry*
  • Protein Stability
  • Protein Structure, Secondary
  • Spectroscopy, Fourier Transform Infrared
  • Taste*
  • Temperature
  • Time Factors
  • Water / chemistry*

Substances

  • Powders
  • Protein Hydrolysates
  • Water