Balıklarda ve bazı su ürünlerinde trimetilamin (TMA) ve dimetilamin (DMA) oluşumunu etkileyen koşullar

TMAO balıklarda osmoregülasyondan sorumlu quarterner amonyum bileşiğidir. "TMA TMAO nun mikrobiyal parçalanmasıyla oluşur.DMA ve FA, TMAO nün enzimatik yıkımıyla oluşur. Bu maddeler genellikle balık kalitesinin belirlenmesi amacıyla kullanılmaktadır. TMAO kokusuz bir bileşiktir, TMA mn ise koku eşiği çok düşüktür, saf amonyak kokusundadır, balık yağlarıyla reaksiyona girdiğinde balıksı kokudan sorumludur. Soğuk depolama sırasında TMA üretimi DMA üretiminden daha fazladır. Dondurulmuş balıklarda mikrobiyal aktiviteye bağlı olarak TMA üretimi gerçekleşmez, TMAO dan enzimatik parçalanmayla DMA ve FA oluşur. TMA buzda depolanan balıklar için kalite indeksi olarak kullanılır. Tür, kas tipi, avlanma bölgesi, avlanma metotları, işleme teknikleri, ve depolama tipi TMA oluşumunu etkiler.

Anahtar Kelimeler:

balık (gıda), protein olmayan azot, dimetilamin, deniz ürünleri, trimetilamin

The factors affecting trimetilamine (Tma) and dimetilamine (Dma) formation in fish and some seafood

TMAO is a quaternary ammonium compound which is responsible for osmoregulation in marine fish. TMA, is formed by microbial reduction of TMAO. DMA and FA are formed by enzymatic degradation of TMAO. These substances are generally used to determine the quality of fish. TMAO has no odour, while TMA has very low threshold. It smells like ammonia in purified form and it is responsible for fishy odour when reacts with fat in fish tissue.During the cold storage, TMA production is higher than DMA production. However in frozen fish, there is no formation of TMA due to the inhibition of microbial activity but DMA and FA are formed by enzimatic degradation of TMAO. TMA is used as a quality index only for ice stored fish. Species, muscle type, fishing area, fishing methods, processing techniques and storage type affect TMA formation.

Keywords:

fish, nonprotein nitrogen, dimethylamine, seafoods, trimethylamine,

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Aguilar, R.P., M.E. Lugo-Sanchez, and M.R.R. Burgueno. 2000.Postmortem biochemical and functional characteristic of monterey sardine muscle stored at 0°C. Food Chemistry and Toxicology, 65, 1, 40-47.

Botta, J.R. 1995. Chemical methods of evaluating freshness quality, p. 9-33. In Y.H. Hui [eds.], Evaluation of seafood freshness quality. VCH. Publishers, Inc, New York. Haard, N.F. 1992. Biochemical reactions in fish muscle during frozen storage, p.176-210. In E.G. Bligh [ed.], Seafood science and technology. Fishing New Books, Canada.

Hebard, C.E., G.J. Flick, and R.E. Martin. 1982. Occurance and significance of trimethylamine oxide and its derivatives in fish and shellfish, p. 149-176. In R.E. Martin, G.J. Flick, C.E. Hebard, D.R. Ward [eds.], Chemistry and biochemistry of marine food products. Avi Publishing Company, USA.

Hultin, H.O. 1992. Trimethylamine-N-oxide (TMAO) demethylation and protein denaturation in fish muscle, p. 25-43. In G.J. Flick, R.E. Martin [eds.], Advances in seafood biochemistry. Technomic Publishing Company, USA.

Huss, H.H. 1988. Fresh fish quality and quality changes. FAO Fisheries Series No. 29, Rome.

Magnusson, H., E. Martinsdottır. 1995. Storage quality of fresh and frozen- thawed fish in ice. Journal of Food Science, 60, 2, 273-278.

El Marrakchi, A.E., M. Bennour, A. Hamama, H. Tagafait. 1990. Sensory, chemical and microbiological assessments of moroccan sardines (Sardina pilchardus ) stored in ice. Journal of Food Protection, 53, 7, 600-605.

Martin, R.E., J.H. Rodney, M.D. Pierson. 1978. Quality assessment of fresh fish and the role of the naturally occuring microflora. Food Technology, 188-192.

Özden, Ö., N. Gökoğlu. 1996. Soğukta saklanan sardalya balığının Sardina pilchardus (W. 1792) raf ömrünün belirlenmesi. Gıda Teknolojisi, 1, 6, 37-42.

Regenstein, J.M., M.A. Schlosser, A. Samson, and M. Fey, 1982. Chemical changes of trimethylamine oxide during fresh and frozen storage of fish, p. 137-148. In R.E. Martin, G.J. Flick, C.E. Hebard, D.R. Ward [eds.], Chemistry & Biochemistry of Marine Food Products, Avi Publishing Company, USA.

Shahidi, F., E. Durnford. 1998. Flavor of fish meat, 131-152. In F. Shahidi [ed.], Flavor of meat, meat products and seafoods. Blackie Academic & Professional, London.

Varlık, C. 1994. Soğukta depolanan sardalyalarda histamin düzeyinin belirlenmesi. Gıda Teknolojisi, 19, 2, 119-124.