dizaharide Flashcards

1
Q

ce dizaharide prezinta leg monocarbonilica

A

MALTOSA
CELOBIOZA
LACTOZA

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2
Q

ce dizaharide au legatura eterica dicarbonilica

A

ZAHAROZA
TREHALOZA

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3
Q

in ce este solubila zaharoza

A

apa

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4
Q

in ce este greu solubila zaharoza

A

alcool

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5
Q

ce substanta este zaharoza (fizic)

A

solida cristalizata incolora

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6
Q

zaharoza este o dextrogira. ce rotatie specifica are?

A

+66,5 grade

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7
Q

enzima pt celobioza

A

emulsina

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8
Q

enzima pt zaharoza

A

MALTAZA
si INVERTAZA

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9
Q

cum se numeste solutia obt din hidroliza zaharozei

A

zahar invertit/miere artificiala

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10
Q

ce se intampla cu zaharoza dextrogira dupa hidroliza

A

devine levrogida ( beta-D-fructofuranoza)

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11
Q

cum se mai numeste desc termica a zaharozei

A

caramelizare

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12
Q

cum se topeste zaharoza

A

prin incalzire USOARA

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13
Q

in ce se transforma zaharoza prin racire

A

amorfa (necristalizata, fara forma precisa)

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14
Q

amorfa incalzita peste …. grade devine bruna (se caramelizeaza) apoi devina neagra (se carbonizeaza)

A

185 grade C

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15
Q

cum este H2SO4 concentrat legat de apa, ce se intampla cand e apa scoasa cu carbonul?

A

hidroscopic, ramane numai carbonul- carbon poros

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16
Q

ce se intampla cu dizaharidele monocarbonilice

A

au un hidroxid liber, trec in forma carbonilica prin transpozitie si se oxideaza la COOH ==> reduc Br2, Fehling si Tollens