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| Nguyen, Thi-my-huong; Sylla, Khalifa Serigne Babacar; Randriamahatody, Zo; Donnay-moreno, Claire; Moreau, Jacques; Luyen Thi Tran,; Berge, Jean-pascal. |
| Long-term proteolysis of tuna by-products (head, viscera and tail) by the wide spectrum protease Protamex has been investigated and compared. After hydrolysis, two fractions (soluble aqueous phase and insoluble sludge) were collected. Chemical compositions of each fraction and molecular mass distributions of soluble peptides were determined. Degrees of hydrolysis obtained after 12 h of hydrolysis of head, viscera and tail were 32.3, 16.8 and 22.2 %, respectively. Nitrogen recovery in the soluble fractions was 73.6 % for the head, 82.7 % for the viscera and 85.8 % for the tail. Lipid distribution indicated that the majority of lipids remained in the sludge. Such proteolysis appears useful for the production of very different fractions: one rich in peptides... |
| Tipo: Text |
Palavras-chave: Tuna; By-products; Proteolysis; Nitrogen recovery; Fish protein hydrolysates. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00030/14142/14042.pdf |
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| Randriamahatody, Zo; Sylla, K. S. B.; Nguyen, Thi-my-huong; Donnay-moreno, Claire; Razanamparany, L.; Bourgougnon, N.; Berge, Jean-pascal. |
| To generate and recover elements from shrimp heads, proteolysis was performed with commercial acidic or alkaline proteases for 22 h. The resulting phases were characterized for protein and lipid content and amino acid composition while the molecular profiles of soluble peptides were established. Whatever the protease used, more than the half of the initial dry matter was found into aqueous phase including most of the proteins while lipids were found to remain insoluble. Hydrolysates were mainly constituted by small peptides (480% below 1000 Da) with up to 14–15 amino acids identified. Moreover, all the hydrolyses have led to an increase of the amount of essential amino acids into the hydrolysates, including lysine. Thus, such proteolysis of shrimp heads can... |
| Tipo: Text |
Palavras-chave: By-products; Shrimp; Proteolysis; Hydrolysate. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00055/16646/14196.pdf |
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| Randriamahatody, Zo. |
| Marine by-products represent valuable biological resources able to generate molecules with biological and nutritional interests. The objective of the present study is to investigate nutritional potentials of hydrolysates from fished and farmed shrimp heads from Madagascar. Thus, 4 enzymes operational at extreme pH conditions were screened : Pepsin, Novozym 37020, Protex 6L and Delvolase. Pepsine was the most efficient enzyme conducing to the production of small-sized peptides with molecular weight inferior to 1 000 Da and the amelioration of amino acids profile, promoting the nutritional quality. Then, peptic hydrolysis was optimized by using different pH conditions and different enzyme inactivations. Introduction of resulting hydrolysates into traditional... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00043/15456/12831.pdf |
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