Reports

Biodiversity in hot springs in Krísuvík and Gunnuhver in Reykjanes: Research carried out due to the Framework Plan for the utilization of geothermal energy in high-temperature areas

Published:

01/08/2007

Authors:

Sólveig K. Pétursdóttir, Sólveig Ólafsdóttir, Steinunn Magnúsdóttir, Guðmundur Óli Hreggviðsson

Contact

Steinunn Ásbjörg Magnúsdóttir

Project Manager

steinunn.magnusdottir@matis.is

Biodiversity in hot springs in Krísuvík and Gunnuhver in Reykjanes: Research carried out due to the Framework Plan for the utilization of geothermal energy in high-temperature areas

This study of the ecosystem in the hot springs in the Krísuvík area is the third biota assessment carried out within the Framework Program, but the first two dealt with the ecosystem in the hot springs in the Hengill area and in the Torfajökull area.

Emphasis was placed on the thermal area in Seltún, where sampling was joint with the geochemists of the Institute of Earth Sciences, which was the first step in an interdisciplinary approach to the subject, which is hoped for, but is still in its early stages. Other areas that were tried to explore were hot springs by Austurengjahver and the area by Gunnuhver in Reykjanes. The temperature in the hot springs in Seltún was in the range of 53-93 ° C and furthermore one soil sample was reported which was taken at a lower temperature or 34 ° C. The acidity of the hot springs in Seltún was in the range of pH 2.5-6. The temperature in the hot springs at Austurengjahver was between 50-75 ° C and the pH pH 2.4 - 4.3. The temperature in the hot springs at Gunnuhver was measured in the range of 70-90 ° C and the pH pH 3.8 - 4.2. A total of thirteen samples were taken in the above areas and DNA was successfully isolated from seven of them. DNA could not be extracted from the samples at Austurengjahver. Nucleic acid amplification of the 16S rRNA, a species-differentiating gene of the nuclear nucleus, was performed on six samples. Amplification was obtained from all these samples with specific real bacterial indicators, but three with ancient bacterial indicators.

A total of 304 sequences of real bacterial species were obtained in the area known as Seltún. These species are spread over 26 species which in turn are spread over 10 camps. The primitive species of the Aquificeae array house over 80% sequences and are therefore predominant in these samples and are primary producers in the ecosystems of the hot springs. Five species within this array were found in the samples from Seltún. Other species are mainly classified into different groups Proteobacteria (13%) but they are a very diverse group. Other species found are sparsely populated and less important here. A total of 81 sequences of ancient bacterial species were obtained from the Seltún area. Most of them or space 90% are classified as Thermoplasmatales within the Euryarchaeota class, but this is a heat and acid species. Other ancient bacteria in the samples in Seltún belong to the Chrenarchaeota group, mostly to the genus Desulfurococcales.

A total of 56 actual bacterial differentiations were obtained from the hot springs at Gunnuhver. The vast majority of them (about 70%) belong to the primitive class Aquificeae, but about 30% to different groups of Proteobacteria. The ancient bacteria in Gunnuhver are homogeneous as they are all of the genus Sulfolobales which is a very heat and acid group. 1 Overall, it can be said that the area around Seltún shows a typical pattern of a peripheral ecosystem where one species is predominant and other species are spread over various factions. The calculated biodiversity in the samples was relatively low or in the range of 1.0-2.0. For comparison, the same coefficient calculated for samples from the Torfajökull area and at Ölkelduháls was in the range of 1.1-4.7. The environmental conditions of temperature and acidity in Seltún and Gunnuhver are not on the edge, but it is likely that substances and compounds in the hot springs and clay can affect the diversity of the ecosystem, ie. which species get thrive and which do not.

Rare species that had only distant relatives in Genbank were found in the Seltún samples, among others. In most cases, however, there are only 1-2 representatives of the species in question. Most of these distantly related species were classified as Proteobacteria and Acidobacteria.

Matís - Prokaria will probably continue to work on sampling and species analysis in the Krísuvík area. The intention is to include these results in a final summary of the ecosystem in hot springs in Iceland in the last year of the Framework Program.

View report

News

Microwave oven with controls and crystal sensors

Matís uses various equipment and tools to work on research and development projects, such as a single microwave oven that the company has had significantly modified for product development. The equipment is used to check the heating or boiling of food.

This is very valuable equipment because major changes have been made to the microwave oven. Matís researchers use thermometers, so-called crystal sensors, which are connected to the food and are inside the oven.

Microwave

This way you can measure the condition of the food. Control equipment has also been added to make the best use of the microwave in research.

News

Two articles from Matís are published in scientific journals

Recently, two articles by Matís staff appeared in prestigious foreign scientific journals. On the one hand, there is an article on the subcooling of char and on the other hand, there is an article on the shelf life and stability of fish powder.

An article published in the 3rd issue of the International Journal of Food Engineering 2007 discusses the shelf life of char stored in different conditions and emphasizes overcooling. The article is entitled Effects of Dry Ice and Superchilling on Quality and Shelf Life of Arctic Charr (Salvelinus alpinus) Fillets. The main author of the article is Huynh Nguyen Duy Bao from Vietnam, and the co-authors are Sigurjón Arason and Kristín Anna Þórarinsdóttir from Matís.

Delicious pieces of char

Bao was a student at the University of Iceland's Fisheries School in the winter of 2004-5 and worked on a project on this subject under the guidance of Sigurjón and Kristín Anna. According to Sigurjón, research on the effects of subcooling in Iceland has mainly focused on marine fish such as cod, but char was chosen in the aforementioned Bao project, as this fish is more similar to the fish species caught in Vietnam.  Read the article

Another recently published article in the Journal of Aquatic Food Product Technology discusses studies on the shelf life and stability of a protein-rich fish powder made from saithe and intended for human consumption. The article is entitled “Stability of Fish Powder Made from Saithe (Pollachius virens) as Measured by Lipid Oxidation and Functional Properties, ”and its main author is Margrét Bragadóttir, who worked for IFL for a long time, but other authors are Eyjólfur Reynisson, Sigurjón Arason and Kristín Anna Þórarinsdóttir, who all work for Matís.  Read the article 

As many people know, Icelanders produce a lot of fishmeal, especially from pelagic fish species such as capelin, blue whiting and herring, but there is also a considerable amount of extra raw material that comes from fish processing, such as cuts and ridges. Fishmeal has so far been mainly used in animal feed, but there has long been interest in investigating whether and how a larger proportion of this raw material could be used for human consumption, as a raw material called extra raw material is rich in protein and fat. 

In this connection, it may be mentioned that Matís' subsidiary, Iceprótein ehf, which operates in Sauðárkrókur, is now researching how extra raw materials from cod can be used to produce high-quality proteins.

News

More taste: Lambs raised on angelica

Hafnar is trying to raise Icelandic lambs on angelica. The aim is to investigate how high the taste quality is in raising lambs on strong vegetation instead of traditional summer work. Matís (Matvælarannsóknir Íslands) intends to investigate the effect of angelica grazing on the taste of lamb.

The project is initiated by Halla Steinólfsdóttir and Guðmundur Gíslason, sheep farmers at Ytri-Fagradalur in Skarðsströnd. They plan to raise a certain number of lambs in a grazing area with angelica. For comparison, other lambs will be placed in pasture and on farmland. The aim is to raise angelica to be applied to the lambs before slaughter and to start production of lamb meat based on this method. If the project yields positive results, the aim is to start selling lamb meat based on such uniqueness.

Sheep.

Angelica is considered a good herb

Angelica was previously considered a budding remedy and was also considered a remedy for all. Now the interest in this herb is resurfacing as people become more aware of the substances it puts into it. Angelica has been used to flavor food and is considered a good herb. Therefore, it is interesting to look at what it means in the taste quality of meat to raise lambs in part on angelica before slaughter.

Research in this country has shown that lambs raised in different conditions before slaughter give a different taste. It is also known from abroad that it is possible to raise lambs before slaughter under different conditions and thereby create a certain uniqueness through the sale and marketing of meat.

Angel.

Matís researches the taste of the meat

At Matís, the effect of angelica grazing on the taste of the meat will be examined. It will be examined whether it is possible to detect differences in the taste and texture of the meat after grazing / feeding. In the case of significant differences, all aspects of sensory evaluation will be examined, such as taste, smell, appearance and texture. Then it becomes clear what the difference is, such as whether it is a side dish. Matís has specially designed facilities for sensory evaluation according to international standards. Matís also has a sensory evaluation group that is specially trained for different sensory evaluation tests.

Lamb carcasses.

The project is carried out in collaboration with the Agricultural University of Iceland and Búnaðarsamtök Vesturlands.

Bændablaðið's news about the angel lambs.

News

Search for unknown bacteria in Skaftárkötlar

Matís participates in research on the ecosystem of the reservoir in Skaftárkötlar and oversees the sampling of its microbial flora. It is hoped that unknown species of micro-organisms (bacteria) can be found that can be further studied and used in biotechnology. The ice cap over the lagoon is about 300 meters thick and the lagoon about 100 meters deep and requires a special smelting drill to get through the ice cap.

For the past two summers, extensive research has been carried out in the Skaftár boilers at Vatnajökull. This is a collaborative project of several domestic and foreign companies and institutions, including Matís, the National Energy Authority, the Icelandic Meteorological Office, the Institute of Earth Sciences, the University of Hawaii and Montana State University, where Þorsteinn Þorsteinsson at the National Energy Authority has supervised the project.

Last year, measurements were made and drilled into the western Skaftár boiler and the important experience of that trip was used this year when drilling in the eastern boiler. The research expedition took place from 1 to 9 June and measurements were made on the eastern Skaftár boiler and Árni Rafn Rúnarsson, an employee of Matís microbial research, took part in the expedition and supervised sampling for research on the microbial flora of the reservoir. The expedition was extremely successful as the improved Vatnamælingar (OS) smelting drill was used and drilled into the boiler in two places, with good results.

300 meter thick ice cave

The ice shelf turned out to be about 300 meters thick and the lagoon in the boiler under the ice shelf measured about 100 meters deep. In addition, a new sample was used and samples were taken at different depths from the boiler for microbial and chemical measurements. As the lagoon is under the ice shelf of the glacier, this is a unique situation where such water under a glacier is very rare and there is a very isolated and well-preserved ecosystem.

The intention is to make the most of molecular molecular methods for the analysis of the microbial flora of the boiler, and it is even to be expected that there will be previously unknown types of microorganisms that can be further studied and used in biotechnology.

What are microorganisms. See more at Science website of the University of Iceland.

Skaftark07_040ThorsteinnBorar
Skaftark07_023BoradIByl
Skaftark07_069ArniOgAndriSotthreinsaSynataka
syni_ur_synatakal_123

News

ÍSGEM: chemical content of 900 foods

Matís (Matvælarannsóknir Íslands) has opened a database on the chemical content of food. The database, called ÍSGEM, contains information on substances in about 900 foods in Iceland.

Among other things, you can get information on proteins, fats, carbohydrates, water, energy, vitamins, minerals and undesirable substances such as mercury, lead, cadmium and arsenic.

Salad2

You can view the ÍSGEM database here.

News

Dried fish is even healthier than previously thought

Dried fish is a very healthy food, light, nutritious and rich in protein, according to a new study by Matís on dried fish as a healthy food. It turns out that dried fish is a rich protein source with 80-85% protein content.

Dried fish is always made from new and fresh ingredients and is almost exclusively caught on line, so it is ensured that it suffers as little damage as possible on the way to land. Such a fishing method meets the best conditions for environmentally friendly fishing.

Dried fish, made from catfish, haddock, cod, blue whiting and halibut, has long been one of the main foods of Icelanders. The drying stored nutrients well and made it possible to store and have them on offer all year round when food supply fluctuated according to the season. In recent times, it has been a tradition to eat dried fish in the dry season. It has also been consumed as a snack in homes and as a packed lunch during summer holidays. Total production and sales have been around 200-250 tons per year.

IMG_3327

It has become increasingly clear that fish protein is important in terms of hygiene. For example, fresh haddock has a 17-19% protein content, while haddock dried fish has a 75-80% protein content. It is estimated that a healthy adult needs 0.75 g of protein per kg of body weight. Therefore, a man weighing 70 kg needs 53 g of protein per day. To get this amount from dried fish, he needs to eat over 66 g. A woman weighing 55 kg needs 41 g of protein a day, or 51 g of dried fish.

Dried fish is therefore suitable for those who seek to get additional protein from their diet, such as for people who do mountaineering or sports and fitness. Furthermore, it has been found that the salt content is somewhat higher in dried fish that is dried indoors than fish that is dried outdoors. However, the salt content of the product can be controlled and it is therefore easy to control such use. Trace elements (elements) are well within the recommended daily allowance, except selenium. The amount of selenium in 100 g is three times the recommended daily dose but is not considered harmful in any way.

Therefore, Matís' research shows that dried fish fulfills all the conditions as a good protein source.

You can view the chemical content of dried fish in ÍSGEM (Icelandic database on the chemical content of food) here.

The project is funded by the AVS Fisheries Research Fund.

Matís report on dried fish (Research results).

News

Survey on health claims: Deadline for submission extended

Icelanders are taking part in a comprehensive pan-Nordic survey of people's attitudes in Europe towards health claims on food. The results of the survey will be used in connection with a new regulation on health claims in food that is currently coming into force within the European Union. Matís (Icelandic Food Research) is conducting another survey in Iceland.

The survey, which is electronic and funded by the so-called NICe fund, covers about 2,500 people in Iceland. It has been decided to extend the deadline for people to submit answers until mid-July due to the pressure that has arisen due to the great interest of people in Europe in participating in the survey on the Internet.

There is a growing trend for food to be labeled with so-called health claims. There may be claims about the nutritional content of foods, such as low-fat, cholesterol-free, low-calorie, and the effects of consuming individual foods on the health of consumers. The aim of the survey is to examine people's attitudes towards health claims and how they understand different health claims on food.

The results of the survey will be presented in all countries, as well as food companies, consumer organizations and authorities. It is not clear when the survey will take effect in Iceland, but assertions are still being collected that go on the so-called positive list of the regulation, ie. list of permissible assertions.

Reports

Process control for fishing, processing and processing of salted fish. Effects of different salting methods on the effect of cod fillets

Published:

01/07/2007

Authors:

María Guðjónsdóttir, Þóra Valsdóttir, Ása Þorkelsdóttir, Kolbrún Sveinsdóttir, Hannes Magnússon, Sigurjón Arason, Kristín A. Þórarinsdóttir

Supported by:

AVS, Rannís Technology Development Fund

Contact

Þóra Valsdóttir

Project Manager

thora.valsdottir@matis.is

Process control for fishing, processing and processing of salted fish. Effects of different salting methods on the effect of cod fillets

A comparison was made of the effects of different salting methods on the utilization, quality and other properties of salted cod fillets. One group was only pre-salted but other groups were pre-salted in different ways, ie. by brine salting, spraying and / or pickling. Injured fish had a higher utilization and came out better in quality assessment than uninjected fish. However, the results indicated that the odor and taste of action were higher in unsprayed fish. The effect of phosphate use and spraying on drying properties due to higher water and salt content in products was investigated. It was found that injected fish lost less weight during drying. For the aforementioned reasons, the water content turned out to be higher after drying than in unsprayed fish. The fillets of the dried products varied according to whether the chemical content was based on drying or weight loss on drying. Therefore, the criteria for new salting processes need to be revised and drying processes need to be adapted to the changed properties of salted products.

The effects of different salting processes on yield, quality and other characteristics of salted and cured products were evaluated. Various combinations of salting steps were tested, one group was only dry salted but other groups were first pickle salted, brine injected and / or brine salted. The injected products had higher yield and higher quality than other products. The results indicated that the curing odor and flavor were stronger in products that were not injected. The water and salt content was higher in injected fillets which is important with regard to continuing processes, like drying and rehydration. Measurements during and after drying showed that injection resulted in lower drying rate and higher water content of the fillets. Dried products have been rated in different classes with regard to water content and weight changes during drying. Due to changes in the salting process and drying properties of the salted fish, these reference values have to be reconsidered.

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Reports

Process control for fishing, processing and processing of salted fish. Impact of post-catch cooling on utilization and quality (2)

Published:

01/07/2007

Authors:

Þóra Valsdóttir, Karl Rúnar Róbertsson, Egil Þorbergsson, Sigurjón Arason, Kristín Anna Þórarinsdóttir

Supported by:

AVS, Rannís Technology Development Fund

Contact

Þóra Valsdóttir

Project Manager

thora.valsdottir@matis.is

Process control for fishing, processing and processing of salted fish. Impact of post-catch cooling on utilization and quality (2)

The purpose of the experiment was to investigate the effect of different cooling methods on board a fishing vessel on the quality and utilization of salted fish in terms of whether the fish was filleted or flattened before processing. There has been different experience with the use of liquid ice, but there have been theories that it has a negative effect on quality and utilization. The use of liquid ice in the train was at least worse in terms of quality and utilization compared to flake ice, whether it was processed fillets or flat fish. Discharge was more pronounced in fillets than in flat fish, but it could not be linked to cooling methods on board.

The aim of the trial was to investigate the effects of different cooling methods onboard a fishing vessel on curing characteristics during heavy salting of cod. The fish was either splitted or filleted before salting. It has been claimed the use of liquid ice for cooling of raw material, may lead to lower yield and quality of the products. The results showed that products from fish stored in liquid ice from catch to processing were similar or better than from fish stored in flake ice. Gaping appeared to be more related to fillets than splitted fish, but this factor could not be linked to chilling methods used onboard.

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