A novel multi-biofunctional protein from brown rice hydrolysed by endo/endo-exoproteases

Food Funct. 2016 Jun 15;7(6):2635-44. doi: 10.1039/c5fo01344e. Epub 2016 May 17.

Abstract

Brown rice, which is a less allergenic food grain and contains essential amino acids, was hydrolysed by bromelain and PROTEASE FP51® to improve its functionalities and taste for food applications. The hydrolysate prepared by bromelain (eb-RPH) had high protein solubility, surface hydrophobicity, low molecular weight peptides, hydrophobic amino acids (leucine, valine and glycine) and flavor amino acids (glutamic acid and aspartic acid). The eb-RPH exhibited higher 1,1-diphenyl-2-picrylhydrazyl (DPPH˙) and 2,2'-azino-bis 3-ethylbenzthiazoline-6-sulfonic (ABTS˙(+)) radical-scavenging activities of 76.62% and 52.96%, respectively, and possessed a better foaming capacity (221.76%) and emulsifying capacity (32.34%) than the hydrolysate prepared by PROTEASE FP51® (ep-RPH) did. The eb-RPH gave the desired taste, which is attributed to volatile flavor compounds (benzaldehyde, benzeneacetaldehyde and 2-acetyl-1-pyrroline) and non-volatile flavor compounds, such as monosodium glutamate, 5'-guanosine monophosphate and 5'-inosine monophosphate (0.07, 0.03 and 0.05 mg mL(-1), respectively). Brown rice peptides generated by bromelain were novel bioactive peptides with multifunctional properties.

MeSH terms

  • Adult
  • Aspartic Acid / chemistry
  • Chemical Phenomena
  • Endopeptidases / metabolism*
  • Exopeptidases / metabolism*
  • Female
  • Glutamic Acid / chemistry
  • Glycine / chemistry
  • Guanosine Monophosphate / chemistry
  • Humans
  • Hydrolysis
  • Hydrophobic and Hydrophilic Interactions
  • Inosine Monophosphate / chemistry
  • Leucine / chemistry
  • Male
  • Molecular Weight
  • Oryza / chemistry*
  • Plant Proteins / chemistry*
  • Sodium Glutamate / chemistry
  • Taste
  • Valine / chemistry
  • Volatile Organic Compounds / chemistry

Substances

  • Plant Proteins
  • Volatile Organic Compounds
  • Inosine Monophosphate
  • Aspartic Acid
  • Glutamic Acid
  • Guanosine Monophosphate
  • Endopeptidases
  • Exopeptidases
  • Leucine
  • Valine
  • Glycine
  • Sodium Glutamate