Tag: Insulation

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

Comparison of insulation of tanks with experiments and heat transfer models

Published:

01/04/2008

Authors:

Björn Margeirsson

Supported by:

Promens Dalvík ehf, Matís ohf

Comparison of insulation of tanks with experiments and heat transfer models

The aim of the project was to investigate the insulation value of three types of fish tanks. The pots were either insulated with polyethylene or polyurethane foam and of two sizes, 400 and 460 L. In two experiments, the temperature rise of water in the pots was monitored with a time with the initial temperature of the water approx. 4 ° C and ambient temperature approx. 18-20 ° C. The increase in temperature was also assessed using computerized heat transfer (CFD) models. The effect of forced airflow around the pot (forced heat transfer) was assessed by comparison with the heat condition in free heat transfer (in heat). The study showed that there is a considerable difference in the insulation of different pots and the pots came out differently depending on whether it was free or forced heat transfer. The results of measurements and heat transfer models for calm pots were well matched, but the model for wind pots needs to be improved. In further research into the insulation value of the pots, frozen fish should be used instead of water to further mimic the actual situation.

The aim of the project was to investigate the insulation capability of three types of fishing tubs. The tubs were either insulated with polyethylene or polyurethane foam and of two sizes; 400 and 460 L. In two experiments water temperature inside the tubs was monitored with initial water temperature ca. 4 ° C and ambient temperature ca. 18-20 ° C. The water temperature was also simulated in computational fluid dynamics models (CFD models). Influence of forcing air flow around the tubs (forced convection) was evaluated by comparison to free convection. Considerable difference was found between insulation capabilities of the different fishing tubs. Forced convection had different effects on different tub types. A good congruity was between experimental and CFD results for tubs in no wind, but some improvements should be done for the CFD model for tubs in wind (forced convection). In further research on insulation capability of the tubs iced fish should be used instead of water in order to resemble practical situations.

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