Frysepunktsbestemmelse - Danmarks Tekniske Universitet
Frysepunktsbestemmelse - Danmarks Tekniske Universitet
Frysepunktsbestemmelse - Danmarks Tekniske Universitet
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Bachelorprojekt ved KT, DTU Januar 2009<br />
Jan Nielsen Kaj Thomsen<br />
Indholdsfortegnelse<br />
Abstrakt ............................................................................................................................................................. 1<br />
Abstract ............................................................................................................................................................. 3<br />
Forord ................................................................................................................................................................ 4<br />
Indledning .......................................................................................................................................................... 7<br />
Teoretisk baggrund ............................................................................................................................................ 8<br />
Betingelser for vækst af bakterier ................................................................................................................. 8<br />
Ideal Opløsning. ........................................................................................................................................... 10<br />
Kolligative egenskaber ............................................................................................................................. 10<br />
Aktivitetskoefficienter ............................................................................................................................. 12<br />
Beregning af vandaktivitet .......................................................................................................................... 12<br />
Kogepunktshævning ................................................................................................................................ 14<br />
Extended Uniquac ....................................................................................................................................... 16<br />
Osmotisk koefficient. ................................................................................................................................... 20<br />
Osmotisk tryk ........................................................................................................................................... 20<br />
Konserveringteknik ...................................................................................................................................... 21<br />
Fortyndingsvarme ........................................................................................................................................ 22<br />
Fremgangsmåde: ............................................................................................................................................. 25<br />
Baggrunden for forsøgsdesign ..................................................................................................................... 25<br />
Forsøgsforberedelser .................................................................................................................................. 27<br />
S.O.P (Fremgangsmåde). ............................................................................................................................. 30<br />
Opløsningerne laves: ............................................................................................................................... 30<br />
Opstilling: ................................................................................................................................................. 30<br />
Forberedelse til måling: ........................................................................................................................... 30<br />
Frysepunktsmålingen............................................................................................................................... 31<br />
Materialer ................................................................................................................................................ 34<br />
Resultatbehandling. ......................................................................................................................................... 35<br />
Sammenligning med litteratur. ................................................................................................................... 35<br />
Frysepunktsmålingerne. .............................................................................................................................. 36<br />
Vandaktivitet og koncentration. .................................................................................................................. 40<br />
Extended UNIQAUC modellen: .................................................................................................................... 43<br />
Diskussion: ....................................................................................................................................................... 49<br />
Konklusion ....................................................................................................................................................... 51<br />
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