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Related Experiment Videos

New antihypertensive peptides isolated from rapeseed.

Ewa D Marczak1, Hachiro Usui, Hiroyuki Fujita

  • 1Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan.

Peptides
|September 2, 2003
PubMed
Summary

New peptides from rapeseed protein show potent blood pressure-lowering effects in rats. These findings suggest rapeseed protein digests could be developed into functional foods for hypertension management.

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Area of Science:

  • Food Science
  • Biochemistry
  • Pharmacology

Background:

  • Hypertension is a widespread cardiovascular condition.
  • Angiotensin converting enzyme (ACE) inhibitors are a common treatment.
  • Exploring natural sources for novel antihypertensive compounds is crucial.

Purpose of the Study:

  • To isolate and characterize ACE inhibitory peptides from rapeseed protein.
  • To evaluate the antihypertensive effects of these peptides in spontaneously hypertensive rats (SHR).
  • To investigate the potential of rapeseed protein hydrolysates as functional foods for blood pressure management.

Main Methods:

  • Rapeseed protein was digested using subtilisin.
  • Peptides were isolated and their ACE inhibitory activity was determined (IC50).

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  • Antihypertensive effects were assessed in SHR following oral administration of peptides and digest.

    • Main Results:

    • Four ACE inhibitory peptides (IY, RIY, VW, VWIS) were identified.
    • RIY and VWIS are novel peptides with IC50 values of 28 and 30 microM, respectively.
    • All peptides and the rapeseed protein digest demonstrated significant blood pressure reduction in SHR, with varying onset and duration of action. RIY showed efficacy even in aged rats.

    Conclusions:

    • Novel ACE inhibitory peptides were successfully isolated from rapeseed protein.
    • Rapeseed protein hydrolysates exhibit significant antihypertensive properties in vivo.
    • Rapeseed protein shows promise as a functional food ingredient for managing hypertension.