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Samenvatting EXAMEN CHEMIE
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Samenvatting van 5 pagina's voor het vak Chemie - Theorie aan de HoGent (EXAMEN CHEMIE)
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Sunny007
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Bespreek, dmv microscopische en moleculaire structuur, welke rol cellulose speelt in lignocellulosewanneer dit materiaal onderhevig is aan schuifspankrachten. Verklaar.
Microscopisch niveau: de verschillende "lagen" in de celwand & de
oriëntering van de cellulose-(micro)fibrillen.
• Dunne primaire wand
0,2 μm dik0,2 dik
vlechtwerk van ongeordende ketens van cellulosemoleculen ––de fibrillen & lignine
• Dunne secundaire wand Dunne S1:
samengesteld uit 2 CW
samen 0,15 μm dik;
beide celwandenelementen bestaan uit een onder een verschillende hoek geplaatste laag fibrillengeplaatste
fibrillen
• Dikkere secundaire wand S2:
ca 5 μm dik
opgebouwd uit in de vezelrichting lopende fibrillenlopende fibrillen
• Binnenlaag of tertiaire wand Binnenlaag S3:
qua opbouw vergelijkbaar met de wand Swand S11
De vezelholte = het lumen :
transport van water en voedingsstoffen;
het lumen van verschillende cellen staat met elkaar in verbinding via door membranen of “terugslagklepjes”
afgesloten openingen in de wand
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