fabricarea margarinei
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Margarina este o emulsie care contine uleiuri vegetale,
coloranti, lapte, etc…
Fabricarea margarinei si a untului
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GRASIMILE SUNT DE 2 TIPURI:Vegetale(uleiuri) ->
lichideAnimale -> solide C-C ->saturate
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ULEIUL DE COCOS ESTE O GRASIME VEGETALA EXTRASA DIN MIEZUL USCAT AL NUCILOR DE COCOS, NUMIT COPRA ARE CULOARE ALBA SI SE GASESTE SUB FORMA SOLIDA DAR FIINDCA TEMPERATURA DE TOPIRE ESTE DE 26 GRADE, PE TIMP DE VARA DEVINE UN ULEI LICHID.
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Din punct de vedere chimic grasimile vegetale contin legaturi duble C=C sau C C, nesaturate , pe cand cele solide sunt saturate C- C
Compusi principali ai unei grasimi sunt trigliceridele
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Trigliceridele sunt esteri ai acizilor grasi cu glicerina
Triglicerida Triglicerida saturata
Dipalmitosterina
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Uleiurile vegetale, prin Hidrogenare devin grasimi solide , dar de origine vegetala.
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Prezentare facuta de:
Ceausu Sorin Visan Andrei Clasa A-XI-A