Lipooksygenaza w zywnosci pochodzenia roslinnego

• Autorzy: Baraniak B M , Szymanowska U

Warianty tytułu

EN

Lipooxygenase in food of plant origin

• Języki publikacji: PL

Abstrakty

PL

Lipooksygenaza (EC. 1.13.11.12, linoleinian : tlen oksydoreduktaza) jest dioksygenazą zawierającą żelazo, która katalizuje utlenianie wielonienasyconych kwasów tłuszczowych i estrów o układzie cis,cis- 1,4-pentadienu. Głównymi produktami reakcji są sprzężone nienasycone kwasy tłuszczowe i wodoronadtlenki. Generowane przez lipooksygenazę wodoronadtlenki stanowią substraty działania kolejnych enzymów, takich jak: liazy, izomerazy wodoronadtlenkowe, peroksygenazy czy tlenowe syntetazy allenylowe. Początkowe produkty działania lipooksygenazy mogą być degradowane do różnych związków, włączając aldehydy, ketony, alkohole i charakterystyczne związki zapachowe. Lipooksygenazy (LOX) mogą również katalizować proces współutleniania karotenoidów, łącznie z ß- karotenem, co powoduje straty niezbędnych składników odżywczych i powstawanie niekorzystnego aromatu. Lipooksygenazy identyfikowano w różnych organach roślinnych. Białka roślinnych LOX składają się z pojedynczego łańcucha o masie molekularnej około 75-100-103 Da. Fizjologiczne znaczenie lipooksygenaz roślinnych nie jest w pełni wyjaśnione, pomimo istnienia dowodów wskazujących na ich znaczenie w reakcji odpowiedzi na zranienia i inne stresy (np. susza czy atak szkodników-patogenów), ponieważ lipooksygenazy są obecne w biosyntetycznym szlaku powstawania regulatorów, takich jak kwas abscysynowy czy jasmonian metylu. Działanie lipooksygenaz jest pierwszym etapem w procesie powstawania licznych związków barwnych i aromatów. Zainteresowanie lipooksygenazami ze strony technologów żywności wynika z ich zdolności wytwarzania wolnych rodników i nadtlenków, które biorą udział w procesie utleniania witamin, barwników, związków fenolowych i białek.

EN

Lipoxygenase (EC 1.13.11.12, linoleate:oxygen oxidoreductase) is an iron-containing dioxygenase which catalyses the oxidation of polyunsaturated fatty acids and esters containing cis,cis-1,4-pentadiene system. The main reaction products are conjugated unsaturated fatty acids and hydroperoxides. The hydroperoxides generated by lipoxygenase are substrates for hydroperoxide lyase, hydroperoxide isomerase, peroxygenase and allene oxide synthase. The initial products of lipoxygenase activity may be degraded to variety of products, including several aldehydes, ketones and alcohols and characteristic aroma compounds. Lipoxygenases (LOX) may also catalyse the co-oxidation of carotenoids, including ß- carotene, resulting in the loss of essential nutrients and the development of off-flavours. Lipoxygenase has been found in various organs of plants. Plant LOX proteins consist of a single polypeptide chain with a molecular mass about 75-100 kDa. The physiological role of lipoxygenase in plants is not certain, although there is considerable evidence indicating its involvement in wounding and other stress responses (drought and pest/pathogen attack) because lipoxygenases are believed to be on the biosynthetic pathways to the plants regulators abscisic acid and methyl jasmonate. Lipoxygenase activity is also the first step in the pathway leading to the formation of a number of flavour and aroma compounds. Lipoxygenases are of interest to food scientists because of their ability to form free radicals and peroxides which can be involved in indirect oxidation of vitamins, colours, phenolic and proteins.

Słowa kluczowe

PL

technologia zywnosci; utlenianie; wystepowanie; lipooksygenaza; zastosowanie; kwasy tluszczowe; zywnosc pochodzenia roslinnego; mechanizm dzialania

• Wydawca: -
• Czasopismo: Żywność Nauka Technologia Jakość
• Rocznik: 2006
• Tom: 13
• Numer: 2
• Opis fizyczny: s.29-45,rys.,tab.,bibliogr.

Twórcy

autor

Baraniak B M

• Akademia Rolnicza, ul.Skromna 8, 20-950 Lublin

autor

Szymanowska U

• Akademia Rolnicza, ul.Skromna 8, 20-950 Lublin

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