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Handbook of Size Exclusion Chromatography and Related ...

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Table 6 Sequence <strong>of</strong> Techniques Applied to Isolated Potato Starch Granules to Obtain<br />

Reasonable Fractions/Pools<br />

Isolation/<br />

purification<br />

Pooling <strong>of</strong> starch<br />

granules:<br />

sedimentation<br />

in H2O<br />

Preparative SEC;<br />

Identification <strong>of</strong><br />

fractions by<br />

staining:<br />

iodine:<br />

branching<br />

pattern<br />

anthron:<br />

total<br />

carbohydrate<br />

Precipitation <strong>of</strong> lcb<strong>and</strong><br />

scb-glucans<br />

from aqueous<br />

DMSO solutions<br />

Pooling: preparative<br />

SEC<br />

_a: initial<br />

Vret-section<br />

_b: midrange<br />

V ret-section<br />

_c: final<br />

Vret-section<br />

Glucan characterization<br />

bulk þ fraction<br />

analysis<br />

enzymatically<br />

catalyzed<br />

debranching þ<br />

fragment analysis<br />

© 2004 by Marcel Dekker, Inc.<br />

Harvesting j cleaning j cutting j smashing j ...<br />

disperging in H2O ! sieving j centrifugation j ...<br />

† Small granules ! fraction I (Fr.I)<br />

† Large granules ! fraction II (Fr.II)<br />

Iodine staining þ vis-spectroscopy<br />

† E640 nb/lcb-quantification<br />

† E525 scb-quantification<br />

† E640/525 lcb/scb-composition<br />

Anthron-Chromogen:<br />

† E540 total carbohydrates<br />

lcb-glucans:<br />

þ n-butanol:<br />

! Fr.Ibut<br />

scb-glucans:<br />

þ methanol<br />

! Fr.Imet<br />

lcb-glucans<br />

þ n-butanol:<br />

! Fr.IIbut<br />

scb-glucans:<br />

þ methanol<br />

! Fr.IImet<br />

Fr.Ibut_a Fr.Imet_a Fr.IIbut_a Fr.IImet_a<br />

Fr.Ibut_b Fr.Imet_b Fr.IIbut_b Fr.IImet_b<br />

Fr.Ibut_c Fr.Imet_c Fr.IIbut_c Fr.IImet_c<br />

Molecule conformation/branching pattern;<br />

Molecular <strong>and</strong> supermolecular dimensions;<br />

Coherent segments, dynamic interactions<br />

controlled enzymatically catalyzed step-by-step<br />

fragmentation

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