Impact of ultrasound pretreatment on whey protein hydrolysis by vegetable proteases
| Autor: | Eduardo Castaño-Tostado, Sergio de Jesús Romero-Gómez, Silvia L. Amaya-Llano, Lech Ozimek, Lucía Abadía-García, César Ozuna |
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| Rok vydání: | 2016 |
| Předmět: |
Whey protein
Proteases Chromatography medicine.diagnostic_test Chemistry Proteolysis 010401 analytical chemistry 04 agricultural and veterinary sciences General Chemistry 040401 food science 01 natural sciences Industrial and Manufacturing Engineering Hydrolysate 0104 chemical sciences Hydrolysis Papain chemistry.chemical_compound 0404 agricultural biotechnology Biochemistry Enzymatic hydrolysis medicine Denaturation (biochemistry) Food Science |
| Zdroj: | Innovative Food Science & Emerging Technologies. 37:84-90 |
| ISSN: | 1466-8564 |
| DOI: | 10.1016/j.ifset.2016.08.010 |
| Popis: | The ultrasound treatment on whey protein before enzymatic hydrolysis using vegetable proteases was studied. Ultrasound density, temperature, and pretreatment time effects were evaluated on enzymatic degree of hydrolysis, release of Angiotensin I-Converting Enzyme (ACE) inhibitors, and antioxidant activity of the hydrolysates generated. In addition, thermal properties as measured by Differential Scanning Calorimetry (DSC) and changes in secondary structure by circular dichroism (CD) were measured. The results showed that ultrasound density was the only factor that exerted a significant effect on proteolysis increasing the ACE inhibition by 13% and a 95% reduction of hydrolysis time in bromelain hydrolysates, but did not improve the ACE inhibition on papain hydrolysates. Observed changes in denaturation enthalpy (ΔH), reduction of reactive thiol groups, and changes in secondary structure suggest protein rearrangements and aggregate formation. The effect of ultrasound on the whey protein structure produced changes increasing the bioactivity of hydrolysates that could enhance the enzymatic hydrolysis process. Industrial relevance Whey proteins are an important source of bioactive peptides. However, due to their globular structure, they are a complex substrate for enzymatic hydrolysis. Ultrasonic pretreatment could induce changes increasing susceptibility to enzymatic hydrolysis resulting in production of more bioactive peptides. Therefore, treatment of whey proteins with ultrasound waves before enzymatic hydrolysis, offers higher efficiency of enzymatic bioconversion of proteins and production of new biologically active peptide mixtures. |
| Databáze: | OpenAIRE |
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