Abstract
This research examined the physicochemical, functional, and nutritional aspects of pea (PPI) and faba bean protein isolates (FBPI) modified using trypsin at varying levels of hydrolysis. Enzyme hydrolysis decreased the protein content for both pulse protein isolates and increased the lipid content for pea. The surface charge became more negative, and the surface hydrophobicity was enhanced. The surface and interfacial tension, in general, decreased upon hydrolysis. The oil holding capacity for both pulses increased while the water holding capacity decreased. The foaming capacity of FBPI was significantly lowered by hydrolysis, while in the case of PPI, it increased at pH 4.5 and was unaffected at 7.0. The foaming stability increased for both pulses at pH 4.5 but was reduced at pH 7.0. At pH 4.5, hydrolysis enhanced the emulsion activity index of FBPI, while it decreased the index of PPI. The indices increased for both pulses at pH 7.0. The emulsion stability index was generally reduced for FBPI but improved for PPI after hydrolysis. All samples were limiting in tryptophan and the sulfur-containing amino acids, and in vitro protein digestibility decreased after hydrolysis for both pulses. As the results of these changes, overall protein quality improved for FBPI but not PPI. The degree of protein hydrolysis was an important factor in determining the functional and nutritional attributes of modified pulse proteins along with pH and pulse type.
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Funding
Financial support for the present study was provided through Agriculture and Agri-Food Canada’s AgriScience Program (Canadian Pulse Science Research Cluster) under the Canadian Agricultural Partnership, the Saskatchewan Pulse Growers, the Alberta Pulse Growers, the Manitoba Pulse and Soybean Growers and the Natural Sciences and Engineering Research Council of Canada Discovery grant program. The authors gratefully acknowledge support from the Sustainable Protein Production (SPP) program of the National Research Council Canada and by the Aquatic and Crop Resource Development Research Centre as part of its contribution to the SPP program.
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Joy Sareen carried out the experiments, analyzed data, and wrote the first draft of the manuscript. Dai Shi and Andrea K. Stone provided critical review and editing of the draft. Caishuang Xu carried out CGE and SDS-PAGE experiments and data analysis. Brittany Polley carried out the trypsin inhibitor assay. James D. House, Pankaj Bhowmik, and Nandhakishore Rajagopalan provided technical assistance and comments on the draft. Takuji Tanaka and Michael T. Nickerson designed and supervised the research and revised the manuscript drafts. All authors read and approved the final manuscript.
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Sareen, J., Shi, D., Stone, A.K. et al. Effect of enzyme hydrolysis on the physicochemical, functional, and nutritional properties of pea and faba bean protein isolates. Eur Food Res Technol 249, 3175–3190 (2023). https://doi.org/10.1007/s00217-023-04358-y
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DOI: https://doi.org/10.1007/s00217-023-04358-y