Abstract
Okara, a major by-product of the soymilk industry, which is rich in proteins, could possibly release under physiological conditions potential bioactive peptides. Thus, an okara protein isolate was digested sequentially with pepsin and pancreatin for c.a. 4 h. On the basis of its relatively high degree of hydrolysis and antioxidant activities (power reduction and radical scavenging activity), the okara protein hydrolysates at the end of the in vitro digestion were fractionated by ultra-filtration and the obtained ultra-filtered fractions were further tested for angiotensin-converting enzyme inhibition and multifunctional antioxidant activities. In the <1 kDa molecular weight cutoff ultra-fraction the amino acid sequence, TIIPLPV, of a peptide from soybean lipoxygenase-1 with a calculated mass 751.48 Da was identified using LC-ESI-MS/MS techniques. The hydrophobic amino acids present in this peptide, particularly Val at terminal position, could likely be associated with the relatively high health-promoting attributes tested. This study evidenced that the consumption of okara protein may exert health benefits on the basis of the bioavailability and bioactivity of the identified peptide.
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Abbreviations
- 255-min OPH:
-
Okara protein hydrolysate at the end (255 min) of the sequential pepsin plus pancreatin digestion
- AA:
-
Amino acid
- ABTS:
-
2,2′-Azino bis(3-ethylbenzothiazolin-6-sulfonate)
- ACE:
-
Angiotensin-converting enzyme
- ACE-I:
-
Angiotensin-converting enzyme inhibition
- ANOVA:
-
One-way analysis of variance
- dm:
-
Dry matter
- DH:
-
Degree of hydrolysis
- DPPH·:
-
Stable radical 2,2-diphenyl-1-picrylhydrazyl
- FRAP:
-
Ferric reducing/antioxidant power
- GI:
-
Gastrointestinal
- GFC:
-
Gel filtration chromatography
- HHL:
-
Hippuryl-l-histidyl-l-leucine
- LC-ESI-MS/MS:
-
Liquid chromatography electrospray ionisation tandem mass spectrometry
- LOX1.1:
-
Lipoxygenase-1 protein
- MS:
-
Mass spectrometry
- MW:
-
Molecular weight
- MWCO:
-
Molecular weight cutoff
- OPH:
-
Okara protein hydrolysate
- ORACFL :
-
Oxygen radical absorbance capacity-fluorescein
- RP:
-
Reduction power towards Fe(III)
- RSA:
-
Radical scavenging activity
- TBARS:
-
Thiobarbituric acid reactive substances
- TE:
-
Trolox equivalent
- TNBS:
-
Trinitrobenzenesulfonic acid
- Trolox:
-
6-Hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid
- UF:
-
Ultra-filtered
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Acknowledgments
The Spanish Ministry of Science and Innovation through Research Projects AGL2008-0998 and AGL2007-63580, and the European Union through FEDER funds supported this research. Thanks are given to M. Takazumi from Toofu-Ya S.L. for the okara provided. A J-E acknowledges Professor F. Millán for the opportunity and facilities given during his short-term scientific mission to learn the methodology of bioactive peptides at the Instituto de la Grasa, CSIC. The proteomics work was done at the Proteomics Facility UCM-PCM, a member of ProteoRed network, funded by Genoma España.
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Jiménez-Escrig, A., Alaiz, M., Vioque, J. et al. Health-promoting activities of ultra-filtered okara protein hydrolysates released by in vitro gastrointestinal digestion: identification of active peptide from soybean lipoxygenase. Eur Food Res Technol 230, 655–663 (2010). https://doi.org/10.1007/s00217-009-1203-0
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DOI: https://doi.org/10.1007/s00217-009-1203-0