Reports

Improved processing of dried fish proteins / Improved processing of dry fish proteins

Published:

01/05/2014

Authors:

Margrét Geirsdóttir, Aðalheiður Ólafsdóttir

Supported by:

AVS Nr. V 11 038‐11

contact

Margrét Geirsdóttir

Project Manager

mg@matis.is

Improved processing of dried fish proteins / Improved processing of dry fish proteins

The aim of the project was to improve the production process of the start-up company Iceprotein. Iceprotein has worked on the utilization of unused proteins from fish with good results. However, it is necessary to improve the quality of dried products. The purpose of this project was to improve it and thereby ensure the continued development of this important growth point in Skagafjörður.

The aim of the project was to improve the processing of dry fish proteins at the company Iceprotein. Iceprotein is a development company that utilizes cut ‐ offs from fish processing for production of value added protein products. With this project, the aim was to improve their production and thereby strengthening this frontline company in use of fish by‐ products.

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Reports

Isolation, purification and investigation of peptides from fish proteins with blood pressure decreasing properties / Isolation, purification and research on blood pressure lowering peptides from fish proteins

Published:

01/12/2009

Authors:

Margrét Geirsdóttir

Supported by:

AVS Fisheries Research Fund

contact

Margrét Geirsdóttir

Project Manager

mg@matis.is

Isolation, purification and investigation of peptides from fish proteins with blood pressure decreasing properties / Isolation, purification and research on blood pressure lowering peptides from fish proteins

The aim of the project was to study the activity of fish peptides and to isolate, purify and define peptides that have an antihypertensive effect. The project set up facilities and knowledge acquired so far by Matis. This includes a method for measuring ACE inhibitory activity as well as peptide isolation and purification equipment. In collaboration with the University of Iceland, HPLC and Maldi-Tof equipment were used to analyze which peptides were in the active components. The results of the project show that Icelandic fish protein could be an important source of peptides with antihypertensive properties. With the knowledge and facilities that have been acquired in the project, it is possible to develop valuable fish products and health food.

The aim of this project was to study the activity of fish proteins and isolate, clarify and define peptides with antihypertensive properties. During the project time methods and equipment to be able to do this were set up at Matis facilities. This includes method to measure ACE inhibition activity as well as filtration and fractionation units to isolate different fractions of peptides. Furthermore, peptides have been identified in the most active fraction by using HPLC and Maldi-ToF equipment in collaboration with the University of Iceland. With this extensive tool box of know-how, equipment and facilities, development of valuable fish products and nutraceuticals from blood pressure-lowering peptides is possible. Thereby the value of the Icelandic natural resources in the sea can be increased.

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Reports

Blue whiting as a target food

Published:

01/03/2008

Authors:

Margrét Geirsdóttir, Ragnar Jóhannsson

Supported by:

Rannís

contact

Margrét Geirsdóttir

Project Manager

mg@matis.is

Blue whiting as a target food

The aim of the project was to answer the research question: What bioactivity can be obtained from peptides extracted from blue whiting with enzymes? Bioactivity is a prerequisite for the use of blue whiting as a target food. Isolated blue whiting proteins were used as raw materials. The study showed that degraded blue whiting proteins have bioactivity. However, the sensory properties of products did not prove to be good enough and yields were low. This was especially so due to the difficulty of obtaining fresh blue whiting as a raw material. In the second steps of the project, it was decided to use cod. The aim was to investigate in particular whether isolated cod proteins had other properties than hacking in terms of sensory evaluation and antihypertensive properties of products. The result was that no differences in these characteristics were found in the study. The project investigated the interaction of hydrolysis with enzymes and processing properties and bioactivity. The interaction of hydrolyzed blue whiting proteins isolated by a new method and their bioactivity has not been performed before and was an international novelty. The project acquired extensive knowledge in the field of enzyme degradation and the bioactivity properties of protein products.

The aim of the project was to answer the question: What kind of bioactive properties do peptides produced by enzyme hydrolysis of blue whiting have? Some sort of bioactivity is needed if they are to be used in functional food. The substrate for the hydrolysis was isolated blue whiting proteins. Well-known, commercially available enzymes were used to hydrolyze the proteins to different degrees of hydrolysis (%DH). The blue whiting hydrolysates showed bioactive properties, but their sensory characteristics were not good. Furthermore, the yield of the process was low. The reason for this was a shortage of fresh raw material. Thus, in the next steps cod was therefore used. The main aim was to study whether different sensory and bioactive characters were achieved when isolated proteins were used compared to mince. The results of the project indicate that there is no difference. In the project the connection between enzyme hydrolysis and functional and bioactive properties was examined. Main emphasis was on the effect of using isolated proteins as raw material for enzyme hydrolysis. In the project important knowledge in the field of enzyme hydrolysis and bioactivity was gained that will facilitate future research.

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Reports

Isolation, purification and research into antihypertensive peptides from fish proteins

Published:

01/12/2007

Authors:

Margrét Geirsdóttir, Guðmundur Óli Hreggviðsson, Lárus Freyr Þórhallsson, Rósa Jónsdóttir, Patricia Hamaguchi

Supported by:

AVS

contact

Margrét Geirsdóttir

Project Manager

mg@matis.is

Isolation, purification and research into antihypertensive peptides from fish proteins

Studies of peptides derived from various food proteins have found peptides with antihypertensive properties. Icelandic fish proteins could potentially become an important source of such peptides that could be used for the development of valuable fish products and health food. The aim of the project is to study this activity in fish peptides and to isolate, purify and define peptides with antihypertensive effects. The report reports the first results on the isolation of fish protein peptides and measurements of their antihypertensive effects.

Various processed food proteins have been reported to include peptides with possible antihypertensive effect. Fish proteins are a potential source for such blood pressure-lowering peptides that might be used to develop valuable fish products and nutraceuticals. The aim of this project is to study the activity of fish proteins and isolate, clarify and define peptides with antihypertensive properties. The report presents the first results regarding the isolation of fish protein peptides and their bioactive properties as ACE inhibitors.

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