starch- lqc 3b

Question 1

describe the structure of starch

Answer 1

• Composed of alpha glucose joined together by glycosidic bonds in condensation reactions
• Made of amylose and Amylopectin
• Amylose : 1-4 glycosidic bonds, straight chain, spiralled
• Amylopectin : 1-4 AND 1-6 glycosidic bonds, branched

Question 2

uses of starch from seeds

Answer 2

stiffening agents, superabsorbants, starch foam, thickening agents

Question 3

stiffening agents example

Answer 3

for fabric or paper

Question 4

superabsorbants examples

Answer 4

for nappies

Question 5

thickening agents example

Answer 5

for custard or wallpaper paste

Question 6

starch foam example

Answer 6

for packaging