What is starch?
A carbohydrate made of polysaccharides namely amylose and amylopectin.
Starch can exist as linear amylose or branched amylopectin.
How do starches contribute to baked goods?
They provide structure and texture alongside gluten
Starch feeds yeast and interacts with proteins, sugar, and fats.
What are the two main forms of starch?
Amylose and amylopectin
Amylose is linear, while amylopectin is branched.
Where do plants store starch?
In granules, which are compact grains of starch molecules
Starch is stored in roots, tubers, and seeds.
What is the role of glucose in starch?
It serves as an important source of energy for yeast and living organisms
Glucose is metabolized by yeast in bread dough.
What are root starches?
Starches derived from tubers or roots, typically lower in amylose
Examples include potato, tapioca, and arrowroot starch.
What are cereal starches?
Starches derived from seeds, typically have more amylose
Examples include cornstarch and flour.
What happens to starch granules when heated with water?
They swell and gelatinize, thickening liquids
This process is known as starch gelatinization.
What is starch gelatinization?
The process where heated starch granules swell and release starch molecules into liquid
This results in the thickening of the liquid.
What occurs if starch is overcooked?
The starch granules rupture, resulting in a thinner mixture
This is particularly true for root starches that are high in amylopectin.
What is retrogradation?
The process where gelatinized starch molecules recrystallize when cooled
This can contribute to staling in baked goods.
What is syneresis in the context of retrogradation?
The process where amylose molecules migrate closer together, squeezing out water
This is observable in custards where water beads on the surface.
What is the impact of retrogradation on baked goods?
It contributes to staling as starches recrystallize and lose moisture
Stale baked goods can regain texture when reheated.
True or False: Starches dissolve in water at room temperature.
False
Starch granules are compact and do not dissolve until heated.
Fill in the blank: Starches thicken liquids when heated and _______.
water
What happens to starch molecules when cooled after gelatinization?
They can recrystallize, potentially forming a solid gel
This is especially common with cereal starches.
How does cooking affect the texture of rice?
Cooking gelatinizes starch, making rice soft
Overcooking can result in mushiness due to ruptured granules.
What is the significance of the ratio of amylose to amylopectin in starch?
It affects the properties and applications of the starch
Different starches have unique ratios that make them suitable for specific culinary uses.
What are Saccharides?
Otherwise know as carbohydrates- divided into monosaccharides, disaccharides and polysaccharides
What is amylose?
A polysaccharide formed by a straight chain of glucose molecules
What is amylopectin?
A polysaccharide formed by branched glucose molecules
What is glucose?
A monosaccharide and primary source of energy for the bodies cells.
What is gelation temperature?
The temperature at which starch gelatinisation occurs.
What is starch gelatinisation?
The process in which starch granules thicken, swell and release starch into any surrounding liquid.
