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Freitas, Deborah C.; Zambelli, Rafael A.; Ramos, Márcio V.; Oliveira, João P.B.; Souza, Pedro F.N.; Santos, Glauber B.M.; Nagano, Celso S.; Bezerra, Leandro P.; Silva, Ayrles F.B.; Oliveira, Jefferson S.; Freitas, Cleverson D.T.
Food chemistry, 03/2022, Letnik: 373, Številka: Pt AJournal Article
•Antimicrobial peptides were generated from the hydrolysis of wheat gluten proteins.•The hydrolysates exhibited activity against the all six tested fungi.•The hydrolysates extended the shelf life of bread in three days.•28 peptides were sequenced and then the best four peptides were synthesized.•The peptides were able to induce damage to the fungal plasma membrane. Antimicrobial peptides (AMPs) have been reported to be promising alternatives to chemical preservatives. Thus, this study aimed to characterise AMPs generated from the hydrolysis of wheat gluten proteins using latex peptidases of Calotropis procera, Cryptostegia grandiflora, and Carica papaya. The three hydrolysates (obtained after 16 h at 37 °C, using a 1: 25 enzyme: substrate ratio) inhibited the growth of Aspergillus niger, A. chevalieri, Trichoderma reesei, Pythium oligandrum, Penicillium sp., and Lasiodiplodia sp. by 60–90%, and delayed fungal growth on bread by 3 days when used at 0.3 g/kg. Moreover, the specific volume and expansion factor of bread were not affected by the hydrolysates. Of 28 peptides identified, four were synthesised and exhibited activity against Penicillium sp. Fluorescence and scanning electron microscopy suggested that the peptides damaged the fungal plasma membrane. Bioinformatics analysis showed that no peptide was toxic and that the antigenic ones had cleavage sites for trypsin or pepsin.
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