Integrated extraction, structural characterization, and activity assessment of squid pen protein hydrolysates and β-chitin with different protease hydrolysis

Squid pen (SP) is a valuable source of protein and β-chitin. However, current research has primarily focused on extracting β-chitin from SP. This study innovatively extracted both SP protein hydrolysates (SPPHs) and SP β-chitin (SPC) simultaneously using protease hydrolysis. The effects of different...

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Bibliographic Details
Published in:International journal of biological macromolecules 2024-03, Vol.262 (Pt 1), p.130069-130069, Article 130069
Main Authors: Li, Ruimin, Wang, Qiuting, Shen, Yanyan, Li, Mingbo, Sun, Leilei
Format: Article
Language:English
Subjects:
Animals
Antioxidants - chemistry
Chitin
Decapodiformes - chemistry
Escherichia coli - metabolism
Hydrolysis
Peptide Hydrolases - metabolism
Protein hydrolysates
Protein Hydrolysates - chemistry
Squid pen
Staphylococcus aureus - metabolism
Subtilisins - metabolism
β-Chitin
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Summary:Squid pen (SP) is a valuable source of protein and β-chitin. However, current research has primarily focused on extracting β-chitin from SP. This study innovatively extracted both SP protein hydrolysates (SPPHs) and SP β-chitin (SPC) simultaneously using protease hydrolysis. The effects of different proteases on their structural characteristics and bioactivity were evaluated. The results showed that SP alcalase β-chitin (SPAC) had the highest degree of deproteinization (DP, 98.19 %) and SP alcalase hydrolysates (SPAH) had a degree of hydrolysis (DH) of 24.47 %. The analysis of amino acid composition suggested that aromatic amino acids accounted for 17.44 % in SPAH. Structural characterization revealed that SP flavourzyme hydrolysates (SPFH) had the sparsest structure. SPC exhibited an excellent crystallinity index (CI, over 60 %) and degree of acetylation (DA, over 70 %). During simulated gastrointestinal digestion (SGD), the hydroxyl radical scavenging activity, ABTS radical scavenging activity, Fe2+ chelating activity, and reducing power of the SPPHs remained stable or increased significantly. Additionally, SPFC exhibited substantial inhibitory effects on Staphylococcus aureus and Escherichia coli (S. aureus and E. coli), with inhibition circle diameters measuring 2.4 cm and 2.1 cm. These findings supported the potential use of SPPHs as natural antioxidant alternatives and suggested that SPC could serve as a potential antibacterial supplement.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2024.130069