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Disaharidi

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Disaharidi su oligosaharidi građeni od dvije jedinice monosaharida. Za organizam čovjeka najvažniji su disaharidi: maltoza, laktoza, celobioza i saharoza.


Osobine

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Prema načinu vezanja monosaharida u molekuli disaharida dijele se na disaharide maltoznog i trehaloznog tipa. U maltoznom tipu reaguje poluacetalna grupa jednog monosaharida sa nepoluacetalnom grupom drugog monosaharida. Pri tome jedna poluacetalna OH-grupa ostaje slobodna, pa ovakvi disaharidi imaju reducirajuće djelovanje, tj. daju pozitivnu reakciju na Fehlingov reagens i druge kvalitativne testove. Šećeri koji nemaju slobodnu poluacetalnu OH-grupu su nereducirajući. U reducirajuće šećere spadaju: maltoza, laktoza i celobioza, a u nereducirajuće izomaltoza, trehaloza i saharoza.

Također pogledajte

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Reference

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Vanjski linkovi

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Nedovršeni članak Disaharidi koji govori o hemiji treba dopuniti. Dopunite ga prema pravilima Wikipedije.

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Disaharidi
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