Pepsin Hydrolysis of Orange By-Products for the Production of Bioactive Peptides with Gastrointestinal Resistant Properties.
Seyadeh Narges MazloomiAlireza Sadeghi MahoonakLeticia MoraMohammad GhorbaniGholamreza HoushmandFidel ToldráPublished in: Foods (Basel, Switzerland) (2021)
Recently, the use of bioactive compounds in improving human health has received more attention. The aim of the present study was to hydrolyze orange seed proteins using pepsin enzyme to obtain bioactive peptides as well as to study the stability of such activity after simulated gastrointestinal digestion conditions. The method was optimized using different enzyme concentrations from 1% to 3%, hydrolysis times between 2 and 5 h, and an optimal temperature of 33 °C. Biological activities including α-glucosidase inhibition, α-amylase inhibition, Angiotensin I-Converting Enzyme (ACEI) inhibition, ferric reducing antioxidant power, and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity were evaluated. According to the results, a significant higher value of the biological activity (p < 0.05) was observed using an enzyme ratio of 0.03 E/S and hydrolysis time of 3.5 h. After size-exclusion chromatography separation, fractions 45-49 and 50-54 showed the highest biological roles such as antioxidant, ACEI inhibitory, and hypoglycemic. Fractions with the highest biological activity were purified using RP-HPLC and analyzed using nano-liquid chromatography and mass spectrometry. The results obtained after simulated gastrointestinal digestion indicated that peptide fractions obtained after chromatographic separation significantly maintain their activity.
Keyphrases
- liquid chromatography
- mass spectrometry
- tandem mass spectrometry
- simultaneous determination
- high resolution mass spectrometry
- human health
- anaerobic digestion
- high performance liquid chromatography
- oxidative stress
- risk assessment
- solid phase extraction
- gas chromatography
- working memory
- climate change
- high speed
- capillary electrophoresis