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ORIGINAL ARTICLE
Antioxidant Capacity of Lentil Flour Hydrolysates Obtained with Pancreatin
 
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Department of Chemical and Physical Properties of Food, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland
 
2
Department of Biochemistry and Microbiology, Institute of Biology, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
 
 
Submission date: 2022-09-26
 
 
Acceptance date: 2022-10-20
 
 
Online publication date: 2022-11-13
 
 
Publication date: 2022-11-13
 
 
Corresponding author
Magdalena Karamać   

Department of Chemical and Physical Properties of Food, Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748, Olsztyn, Poland
 
 
Pol. J. Food Nutr. Sci. 2022;72(4):381-391
 
KEYWORDS
TOPICS
ABSTRACT
Lentil is a valuable protein-rich crop, the health-promoting value of which can be further enhanced by its protein hydrolysis. In the present study, lentil flour was treated with pancreatin and the antioxidant capacity of the obtained hydrolysates with different degrees of hydrolysis (DH, 4–20%) was determined and compared with that of flour. The molecular weight (MW) distribution of the lentil proteins and their products of hydrolysis was analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Size exclusion-high-performance liquid chromatography (SE-HPLC) was deployed to show the profile of low MW compounds of the hydrolysates. Additionally, total phenolic contents were determined with the Folin-Ciocalteu’s phenol reagent. The hydrolysates had higher antiradical activity against DPPH, Trolox equivalent antioxidant capacity (TEAC) measured by the assay with ABTS•+, ferric reducing antioxidant power (FRAP), and ability to bind Fe2+ compared to lentil flour. Between the hydrolysates, the highest DPPH scavenging activity (EC50 of 0.298 mg/mL), TEAC (98.6 µmol Trolox/g), FRAP (109.2 μmol Fe2+/g), antioxidant capacity of lipid-soluble compounds (ACL) determined by photoluminescence method (4.32 µmol Trolox/g), and Fe2+ chelating activity (80% at hydrolysate concentration of 0.3 mg/mL) were found for those with low DH (4–8%), which contained some subunits of proteins, polypeptides, and peptides with a wide MW range (0.556–66 kDa). The total phenolic content increased with increasing DH. In conclusion, the antioxidant capacity of lentil flour can be significantly improved by the limited hydrolysis of its proteins with pancreatin, as a result of the release of polypeptides and peptides with a wide range of MW. Thus modified lentil flour may be addressed and explored in future research as a functional food ingredient.
FUNDING
This study received no external funding.
CONFLICT OF INTEREST
Authors declare no conflict of interest.
 
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