Reports

Combined Blast and Contact cooling - Effects on physiochemical characteristics of fresh haddock (Melanogrammus aeglefinus) fillets

Published:

01/06/2008

Authors:

Magnea Guðrún Arnþórsdóttir, Sigurjón Arason, Björn Margeirsson

Supported by:

Tækniþróunarsjóður, AVS

Contact

Sigurjón Arason

Chief Engineer

sigurjon.arason@matis.is

Combined Blast and Contact cooling - Effects on physiochemical characteristics of fresh haddock (Melanogrammus aeglefinus) fillets

Skaginn hf. has a patent for new processing technology for the processing of fresh and frozen fillets based on so-called skin cooling before peeling. The purpose of this research project was to compare fillet processing with skin cooling and traditional fillet processing. The project compares fresh fillets and chilled fillets with regard to utilization, quality and shelf life. Two experiments were performed, on the one hand Experiment I where water resistance, quality, boiling efficiency and appearance were examined, and on the other hand Experiment II where these same factors were examined and the effect of erosive cooling on the shelf life of fresh and frozen haddock was examined. The experiments were carried out at Festi ehf. in Hafnarfjörður. The main results of these studies showed that fillet processing with skin cooling has more advantages than traditional fillet processing. The erosive cooling gives higher utilization and more valuable products with a longer shelf life. Increased shelf life of fresh fish provides increased opportunities for export, which is very important for the fishing industry.

The aim of the project was to compare a new processing technique, CBC, with traditional processing of haddock fillets. In the latter the fillets go through the process without additional refrigeration. In the new processing technique, CBC, the fillets, after filleting and pre-trimming, go through pre-cooler / fluid-ice followed by CBC super-chilling. Two trials were performed, a preliminary experiment (I) and a main experiment (II). In the preliminary experiment (I), water holding capacity, quality and cooking yield were examined. In the main experiment (II) these same factors were examined, in addition to the superchilling effect on extended shelf-life of fresh and frozen haddock fillets. After the pre-cooler step, the fillets gained weight with yields of 101.6% to 102.7%. After the CBC super-chilling the fillets had final yields of 100.3% to 101.2%. After skinning, the fillets without refrigeration (traditional processing) lost most weight. The highest value of cooking yield was obtained in CBC super-chilled fillets with skin. Skinless traditional and CBC super-chilled fillets showed similar cooking yield (P> 0.05). CBC super-chilling increased the total yield of the fillets. The difference between the traditional fillets and the super-chilled fillets was significant. The appearance of the CBC super-chilled fillets was much better and with less gaping than the traditional fillets. The traditional fillets had more ragged outlines, and the ratio of cut-offs after fine-trimming was therefore higher for the traditional fillets than the CBC super-chilled fillets. Appearance of the traditional fillets showed a little yellow tinge which increased during the storage time. The CBC super-chilled fillets had a whiter and more "fresh" appearance and were therefore more attractive. Examination of total bacterial count, and amount of TMA and TVN showed that the CBC super-chilling process can extend the shelf life of fresh haddock fillets.

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Reports

Effects of subcooling on salt uptake by pickling cod neck pieces (Gadus morhua)

Published:

01/06/2008

Authors:

Ragnhildur Einarsdóttir, María Guðjónsdóttir, Sigurjón Arason

Supported by:

Rannís Research Fund

Contact

Sigurjón Arason

Chief Engineer

sigurjon.arason@matis.is

Effects of subcooling on salt uptake by pickling cod neck pieces (Gadus morhua)

Salt uptake and shelf life of skinless and boneless cod fillets (Gadus morhua) were studied at different temperatures. Salt uptake was examined at 0.5 ° C, -2 ° C and 5 ° C. The results indicate that fish muscle absorbs salt faster at -2 ° C than 5 ° C and salt uptake occurs most rapidly in the first 5 minutes. When looking for a final salt concentration of 0.6%, 4% brine is most desirable. In the shelf life test, the temperature was 0 ° C on the one hand and - 2 ° C on the other. Shelf life of fillets stored at -2 ° C was found to have a shelf life of 3-4 days longer than those stored at 0 ° C. Enzyme activity, more specifically trypsin-like protease activity, was examined in supercooled fish muscles. Fish muscle with a salinity of 0.5% stored at -2 ° C was found to have higher activity than other groups. The study suggests that it would be interesting to look more closely at the interaction between treatment, temperature and enzymes.

The salt uptake during brining and shelf life of skinless and boneless cod loins (Gadus morhua) was investigated at different temperatures. The salt uptake was studied at 0.5 ° C, -2 ° C and 5 ° C. The results show that the salt uptake of the cod muscle is faster at -2 ° C than at 5 ° C and that the salt uptake is fastest during the first 5 minutes. When aiming for a salt concentration of 0.6% in the muscle during brining it is optimal to use a 4% salt brine. In the shelf life study, samples were stored at 0 ° C and -2 ° C. The cod loins stored at -2 ° C showed 3-4 days longer shelf life than samples stored at 0 ° C. Enzymatic activity, or trypsin like protease activity to be more precise was studied in the superchilled muscle. Cod muscle with 0.5% salt and stored at -2 ° C showed higher activity than other groups. The study shows that there is a need for further studies on the combined effects of processing and storage temperatures on enzymatic activity.

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Reports

Automation in salted fish processing

Published:

01/06/2008

Authors:

Róbert Hafsteinsson, Albert Högnasson, Sigurjón Arasson

Supported by:

Rannís Technology Development Fund

Contact

Sigurjón Arason

Chief Engineer

sigurjon.arason@matis.is

Automation in salted fish processing

This project is a development project between Matís ohf, Vísir hf and 3X Technology where the main goal was to develop equipment and processing systems to simplify the management and control of the processing process of salted fish, thereby ensuring better and more stable quality. The project investigated, among other things, how the equipment affects product quality, emissions, etc. Work efficiency and productivity as well as human savings were examined in particular by comparing Vísir hf's older facilities with the current ones. 3X Technology took care of the design and development of the equipment, Vísir hf provided processing and knowledge as well as putting most of the equipment into use. Matís was responsible for conducting experiments as well as evaluating the quality aspects of the project. The project was intended to address the main aspects of salted fish processing:

• Automatic sorting of fillets coming from a sprayer and into a basket.

• Salting of fillets and flat fish, ie. from brine to dry salting.

Desalination before packing and quality assessment

• Pre-analysis for quality assessment, sorting and packaging (approach of robots).

The main results of the project are that the capacity of Vísir hf in Grindavík and Djúpivogur has increased considerably with the introduction of the equipment from 3X Technology, or up to 20%.

This project is a developmental project between Matís ohf, Vísir hf and 3X Technology where the main objective is to develop an equipment and process plant to simplify the controlling process of salted fish and thereby ensuring continuous and better product quality. In this project, following things where mainly investigated: The influence from the equipment on the product quality. Working economy along with labor saving was specially investigated by comparing the “old” working arrangement with the new one. The company 3X Technology was responsible for the design and the development of the equipment. The salt fish company Vísir hf introduces the new equipment to their process plant along with providing knowledge about the product characteristic. The company Matís ohf took care of all the quality control along with performing all the experiment of this project.

This project is intended to take care of the following main parts in the salt fish processing plant:

• Automatic arranging of fish fillet coming from the injection machine and into the tub box.

• Dry salting fish fillet, ie from the brine storage into dry salt.

• Salting before weighing and wrapping the fish fillet along with quality control.

• Analysis and approach of robots for packing and grading the product.

The main conclusion for this project is that Vísir hf in Grindavík and Djúpavogur has increased their throughput for at approximately 20% by introducing their new equipment from 3X Technology.

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News

Akureyri: B.Sc. project at HA accelerates measurements of PCBs in fish at Matís

Vordís Baldursdóttir recently defended her final project for a B.Sc. degree at the University of Akureyri "Development of a method for measuring PCBs in fish with ASE extracts". She worked on the project under the guidance of Ásta M. Ásmundsdóttir, a specialist at Matís.

Recently, a new device was introduced in the Matís laboratory in Akureyri to prepare samples for the measurement of persistent organic pollutants in ASE 300 (Accelerated Solvent Extraction) foods. The device is based on reducing the substances from the sample under heat and pressure. With the new device, it is possible to prepare samples for analysis in a much shorter time than with older equipment.

Once the PCBs have been extracted from the sample in this way, their amount is analyzed by GC-ECD technology. Vordís 'project was entirely carried out in Matís' research facility in Akureyri and was primarily concerned with the development of new measurement methods using the ASE instrument, in addition to which it improved older methods for GC-ECD in order to shorten the analysis time.

The project led to the fact that it is now possible to perform measurements of PCBs in 12 samples so that the results are available approx. 2 days after the extraction begins, but the same number of samples with the older method took approx. 5 days and this method development has therefore led to significant time savings.

The equipment will be used both for samples from customers and for Matís research projects. Vordís will be a summer employee Matís Chemical Research Department in Akureyri and will, among other things, work on PCB measurements.

News

Matís in Neskaupstaður uses protein analysis equipment

Recently, Matís in Neskaupstaður started using a complete tool for measuring and analyzing fish proteins. The device, from the company Elementar in Germany, is of the type Fast N / Protein Analyzer rapid N cube.

The device is based on the so-called Dumas method, but measurements according to this method is based on dry combustion and measurement of nitrogen in the form of gas (N2). The method is many times faster and more environmentally friendly than the Kjeldahl method, which is widely used for measuring protein in food and feed samples.

According to Þorsteinn Ingvarsson, Matís' station manager in Neskaupstaður, the device is very fast and accurate and therefore makes it very easy to measure nitrogen and proteins in fishmeal.

Matís' office in Neskaupstaður mainly handles microbial and chemical measurements for the fishmeal industry in the East Fjords, but the focus of the fishmeal industry in Iceland is in that area.

The picture shows Karl Rúnar Róbertsson, a specialist at Matís in Neskaupstaður with the protein analyzer.

News

New report on the processing of fish proteins in food supplements

One of the main opportunities for the Icelandic fishing industry is to increase the value of the raw materials that come from the sea. By processing food supplements from fish, it is possible to significantly increase the value of the raw material, not least from underutilized species which are now generally not used for human consumption or by-products and incidental raw materials in traditional food processing. This is stated in Matís' new report.

In the report Fish protein as a dietary supplement, discusses the potential potential of processing a large proportion of seafood into valuable products, in particular the processing of fish proteins for use in the fast-growing food and health products market.

The market for food supplements and health products has grown enormously in recent years. years and such products are now a larger part of people's nutrition than before. Dietary supplements are foods that are intended as a supplement to a regular diet. Proteins in supplements and health products are mainly made from milk and vegetable proteins.

Matís' report concludes that the nutritional composition of fish proteins is optimal as a dietary supplement, but development and research to produce them with the properties that are considered to be the most optimal for dietary supplements have been deficient so far. By processing food supplements from fish, it would be possible to increase the value of the raw material. The aim of the project was to develop fish proteins that were used as dietary supplements.

Processing of proteins into more valuable products

As can be seen in the figure, specialized and developed products are more profitable than general and less processed products. Chances are that profits increase as the products are processed more. The more developed the products are, the more valuable they become and with each step the products approach the pharmaceutical market, their value increases.

News

Matís open meeting in Neskaupstaður Mon. 26.

On Monday 26 May, Matís will hold an open introductory meeting at Verkmenntaskóli Austurlands in Neskaupstaður under the title Opportunities in the fisheries and food industry in East Iceland.

Among the speakers at the meeting are Sjöfn Sigurgísladóttir, CEO of Matís, Helga Jónsdóttir, Mayor of Fjarðarbyggð, along with some experts from Matís. Björk Sigurgeirsdóttir, who is the project manager of Þróunarfélag Austurlands and also the managing director of the East Iceland Growth Agreement, will also speak at the meeting.

The meeting will, as previously stated, be held at Verkmenntaskóli Austurlands at Mýrargata 10, Neskaupstaður, in room 1. The meeting is open to everyone and interested parties are encouraged to attend.

Anna K. Daníelsdóttir and Kristinn Ólafsson: Slides - Genotyping

News

Matís holds a course in Kenya

Two Matís employees are on their way to Kenya to hold a course for fish inspectors. The course is held by the United Nations University's School of Fisheries and is intended as a graduate program for practicing fish inspectors in that country.

This is a new approach to education in developing countries where the purpose is not only to hold courses but also to establish a sustainable course, which the locals take over as a result of the stay of Matís employees.


The course was originally planned to be held in Kisumu, by Lake Victoria, but according to Margeir Gissurarson, another Matís expert who will hold the course, the situation in Kisumu is still precarious after the riots that followed the elections in the country at the end of last year.

The course will instead be held in the port city of Mombasa, Kenya's second largest city. Margeir will be out on May 24th and Franklín Georgsson will be added to the group on May 31st. Both are experienced Africans and well known in the jungles of Africa, but they have held courses in Mozambique under the auspices of the Icelandic International Development Agency (ICEIDA) and went to Kenya in 2007 to prepare for the planned course.

The picture shows Franklín Georgsson (2nd fv; Margeir Gissurarson (b. Middle) and Sigríður Ingvarsdóttir, an employee of the University of the Fisheries School of the United Nations, chatting with locals in Kisuma last year.

News

CHILL ON meeting in Reykjavík

On the 13th and 14th of May. A workshop was held in Reykjavík on the European project CHILL ON. This was the first meeting of work component 5 ("Integration and validation - field trials"). Six employees from Matís attended the meeting, as Matís will play an important role in the project, which is briefly about testing and adapting technological innovations and solutions developed in the project.

The EU market area is the second largest market in the world for fresh and frozen foods and trade in chilled and frozen foods has increased by more than 10% per year in recent years. Fish is the third most consumed food in Europe and due to the freshness of fish, it was decided to study everything related to quality and traceability in the supply chain and transport with chilled and frozen fish in the project.

The CHILL ON project will also work on the development of the same components for chicken products and the supply routes of such products to Europe. In this connection, it may be mentioned that from Brazil, for example, about 250 thousand tons of chicken breasts are exported annually to European markets. Participants in the project come from all over Europe but also from outside the continent, such as from China and South America.

This four-year project is now half over and will end in 2010. More information about the project can be found at project website.

Matís' project manager in CHILL ON is María Guðjónsdóttir.

News

Matís in 12th place among exemplary institutions in the SFR survey

SFR - a trade union in the public service was recently chosen for the third time in the establishment of the year. The survey took place among SFR members on their working conditions and well-being in the workplace. Furthermore, all government agencies were given the opportunity for all employees, regardless of their trade union, to participate.

In the SFR survey, Matís is classified among the larger public institutions and ranks 12th. In fact, Matís lands in a gray area because, strictly speaking, Matís is not a public institution, even though it is wholly owned by the state, but a public limited company (ohf) as can be read here.

This is said on SFR website and in Morgunblaðið. Detailed information on what is behind the survey can be found on the SFR website.

EN