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Molecules 2017, 22(4), 544; doi:10.3390/molecules22040544

A Specific Peptide with Calcium-Binding Capacity from Defatted Schizochytrium sp. Protein Hydrolysates and the Molecular Properties

1
The Key Laboratory of Analysis and Detection Technology for Food Safety of the MOE, College of Chemistry, Fuzhou University, Fuzhou 350108, China
2
Institute of Food and Marine Bio-Resources, College of Biological Science and Technology, Fuzhou University, Fuzhou 350108, China
*
Author to whom correspondence should be addressed.
Academic Editor: Pinarosa Avato
Received: 15 February 2017 / Revised: 19 March 2017 / Accepted: 23 March 2017 / Published: 29 March 2017
View Full-Text   |   Download PDF [2011 KB, uploaded 29 March 2017]   |  

Abstract

Marine microorganisms have been proposed as a new kind of protein source. Efforts are needed in order to transform the protein-rich biological wastes left after lipid extraction into value-added bio-products. Thus, the utilization of protein recovered from defatted Schizochytrium sp. by-products presents an opportunity. A specific peptide Tyr-Leu (YL) with calcium-binding capacity was purified from defatted Schizochytrium sp. protein hydrolysates through gel filtration chromatography and RP-HPLC. The calcium-binding activity of YL reached 126.34 ± 3.40 μg/mg. The calcium-binding mechanism was investigated through ultraviolet, fluorescence and infrared spectroscopy. The results showed that calcium ions could form dative bonds with carboxyl oxygen atoms and amino nitrogen atoms as well as the nitrogen and oxygen atoms of amide bonds. YL-Ca exhibited excellent thermal stability and solubility, which was beneficial for its absorption and transport in the basic intestinal tract of the human body. Moreover, the cellular uptake of calcium in Caco-2 cells showed that YL-Ca could enhance calcium uptake efficiency and protect calcium ions against precipitation caused by dietary inhibitors such as tannic acid, oxalate, phytate and metal ions. The findings indicate that the by-product of Schizochytrium sp. is a promising source for making peptide-calcium bio-products as algae-based functional supplements for human beings. View Full-Text
Keywords: Schizochytrium sp.; defatted protein hydrolysate; calcium-binding peptide; mechanism; cellular uptake Schizochytrium sp.; defatted protein hydrolysate; calcium-binding peptide; mechanism; cellular uptake
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Cai, X.; Yang, Q.; Lin, J.; Fu, N.; Wang, S. A Specific Peptide with Calcium-Binding Capacity from Defatted Schizochytrium sp. Protein Hydrolysates and the Molecular Properties. Molecules 2017, 22, 544.

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