Tag: Enzymes

Reports

Production of valuable products from viscera / Production of valuable products from viscera

Published:

01/03/2014

Authors:

Sigrún Mjöll Halldórsdóttir

Supported by:

AVS

Production of valuable products from viscera / Production of valuable products from viscera

Fish stew is rich in many different substances such as protein, fish oil and minerals, which can be good in all kinds of valuable products. The purpose of the project was to investigate the possibility of using material from slag for pet food and / or fertilizer for plants. Cod processing with and without liver was performed with enzymes: on the one hand Alkalase and on the other hand a mixture of Alkalasa and cod enzymes. Attempts were made to collect fat phase from the slag. The fatty phase was analyzed for fatty acids and peroxide values were measured to assess the degree of development. The protein component was then spray dried and the following measurements were performed: protein content, amino acid analysis, trace element measurement, antioxidant activity (metal chelating ability, DPPH, ORAC, reducing ability and antioxidant activity in the cellular system) and antihypertensive activity. The main results are that the enzymatic slag has an excellent ability to bind to metal and can thus maintain metals (minerals) in a form that both plants and animals can use. The amino acid composition was also very suitable as nutrition for dogs and cats.

Fish viscera is rich in many different materials, such as protein, oil and minerals that can be good in all kinds of valuable products. The purpose of this project was to investigate the possibility of utilizing materials of viscera in pet food and / or fertilizer for plants. Viscera from cod processing with and without liver was processed with the following enzymes: Alcalase and a mixture of Alcalase and cod enzymes. Attempts were made to collect the lipid phase of the viscera. Fatty acids were analyzed in the lipid phase and measured peroxide values to assess the degree of rancidity. The remaining protein solution was spray dried and the following measurements performed: protein content, amino acid analysis, measurement of trace elements, antioxidant (metal chelating, DPPH, ORAC, reducing ability and antioxidant activity in cell systems) and blood pressure lowering activity. The main conclusion is that hydrolysed viscera protein has excellent ability to metal chelation and can thereby maintain metals (minerals) in the form that both plants and animals can utilize. Amino acid composition was also very suitable as nutrition for dogs and cats.

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Reports

Muscle spoilage in Nephrops

Published:

01/09/2010

Authors:

Guðmundur H. Gunnarsson

Supported by:

AVS Research Fund and NORA

Muscle spoilage in Nephrops

The project worked with the lobster industry in Iceland to identify the causes and define solutions to reduce muscle necrosis in lobster. Such myocardial infarction had increased greatly in recent years for no apparent reason. Initially, it was thought that the probable cause of the muscular dystrophy was a Hematodinium infection in the strain, but such an infection has caused considerable shocks in the Scottish lobster strain. It was confirmed that there was no association between Hematodinium infection and myocardial infarction. Subsequently, the emphasis of the project had to be changed. Extensive morphological studies of lobster were able to link muscle necrosis to enzyme activity in lobster hepatopancrea. Based on these results, a solution was defined to reduce the incidence of myocardial infarction. With improved cooling and treatment with enzyme inhibitors, muscle lobster necrosis has been significantly reduced.

This project was carried out in close association with the Icelandic Nephrops fishing and processing industry. The aim was to define reasons and propose solutions to reduce muscle spoilage in Nephrops. Such muscle spoilage had increased significantly during the last few years without any know reason. The original hypothesis of the project was that there might be a correlation between infection of the parasite Hematodininum and muscle spoilage. Such parasitic infection has resulted in lower quality products in the Scottish Nephrops industry for the last decade. In the project it was confirmed that such infection is not the underlying factor for muscle spoilage. This resulted in a change of direction in the project. Based on morphological analysis of Nephrops it was observed that the muscle spoilage was correlated with enzyme activity in the hepatopancrea. Based on this observation it was possible to propose a code of practice to reduce the onset of muscle spoilage. The code of practice is based on improved chilling and use of enzyme inhibitor during the storage of the Nephrops from catch to frozen product.

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Reports

Development of a process for enzyme treatment of liver before canning

Published:

01/09/2009

Authors:

Ásbjörn Jónsson, Irek Klonowski, Sigurjón Arason, Sveinn Margeirsson

Supported by:

AVS Fisheries Research Fund

Contact

Sigurjón Arason

Chief Engineer

sigurjon.arason@matis.is

Development of a process for enzyme treatment of liver before canning

The aim of the project was to increase the value and utilization of liver for canning, by developing a process and processing pathway for enzyme purification in the membrane of the liver to release roundworms located on the surface of the liver. Furthermore, the aim was to develop a method and equipment for brine salting for canning. The results and benefits of the project consisted of the development of a technology with enzymes that is effective in releasing membrane and ringworm on the surface of the liver for canning. Processing speeds increased and utilization increased from 60% to 80-85%. The investment is considered profitable and the return on total investment (ROTA) returns within a few years.

The aim of this project was to increase the profitability in the production of canned liver, by developing a process to remove the ringworms from the membrane at the surface of the liver with enzymes, before canning. Furthermore, to develop a process for brining of liver before canning. The yield and the profit of the project consisted of a development of a technique with enzyme which successfully remove membrane and ringworms from the surface of the liver before canning. The efficiency of production increased along with the yield from 60% to 80‐85%. The investment is profitable and the return on total asset will be in a few years.

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