2.6. Amylose content quantification by gel permeation
chromatography (GPC)
About 100 mg of flour sample was dispersed in 5 mL of 1 N
NaOH solution and stirred at 380 rpm overnight. Several drops of
0.5 M HNO3 were added to neutralize the mixture. The mixture
was then transferred into a 50 mL volumetric flask and diluted.
The aliquot was first centrifuged (2000g, 10 min) to remove some
solid residues. Clear supernatant (20 mL) was taken and filtered to
pass a nylon membrane (0.2 lm).