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Beta-glukany w żywieniu psów
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Wyszukaj w serwisie


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Rola beta-glukanów w żywieniu psów


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Beta-glukany to organiczne polisacharydy występujące zarówno w organizmach prokariotycznych, jak i w eukariotycznych. Zbudowane są z cząsteczek β-D-glukozy, najczęściej sprzężonych wiązaniami 1β → 3 dla każdych trzech albo 1β → 4 dla każdych czterech jednostek glukozy. Ich łańcuch może być zarówno liniowy, jak i z odgałęzieniami. Zawierają do około 250 000 jednostek glukozy. Rozmiar cząsteczki glukanu, jak również różnorodność łańcuchów bocznych wpływa na ich rozpuszczalność – im prostsza jest struktura tego związku, tym z reguły lepsza jego rozpuszczalność w wodzie. Beta-glukany wchodzą w skład ścian komórkowych wielu zbóż, drożdży, alg oraz grzybów. Pochodzenie beta-glukanów ma istotny wpływ na ich biologiczną aktywność. Masy cząsteczkowe beta-glukanów są zróżnicowane w zależności od źródła ich pochodzenia. Najwyższą masą cząsteczkową wyróżniają się beta-glukany izolowane z ziaren owsa i jęczmienia. Ze względu na właściwości fizykochemiczne beta-glukany podzielono na:

  1. beta-glukany o dużej masie cząsteczkowej – ich główny poliglukozowy łańcuch jest wielokrotnie zwinięty, do tej grupy należą: pleuran, lentinian, grifolan i schizofyllan, izolowane z takich gatunków grzybów jak: boczniak ostrygowaty, shiitake, żagwica listkowata (łac. Grifola frondosa) i rozszczepka pospolita (łac. Schizophyllum commune),
  2. beta-glukany o niższej masie cząsteczkowej – posiadają hydrofilowe grupy glukozy oraz tworzą losowe konfiguracje przestrzenne, należy do nich karboksymetylo-glukan,
  3. drobnocząsteczkowe beta-glukany – takie jak zymosan izolowany z drożdży Saccharomyces cerevisiae,
  4. glukany zawierające grupę hydroksylową w α-konfiguracji przy C1 glukozy – prawdopodobnie α-glukany nie wykazują aktywności [...]
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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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Poznaj nasze serwisy