Bakery, Confectionery and Snack Foods
Bakery, confectionery and snack foods depend on controlled ingredient interactions during mixing, fermentation, baking, frying and sugar processing. The exam tests gluten development, leavening, starch gelatinization, sugar crystallization, fat frying and product yield.
Core rules
- Gluten forms when wheat flour is hydrated and mixed. Adequate mixing develops elasticity; overmixing can weaken the dough.
- Yeast fermentation produces CO2 and ethanol. Baking soda and baking powder are chemical leaveners.
- Starch gelatinization occurs with heat and water; it sets crumb structure. Maillard browning and caramelization contribute colour and flavour.
- Sugar crystallization is controlled by interfering agents, temperature and seeding. Invert sugar reduces crystallization in confectionery.
- Frying oil quality is affected by temperature, moisture, food debris and oxidation. High free fatty acids and polar compounds indicate degradation.
Worked example
A bread formula uses 100 kg flour, 60 kg water, 2 kg yeast, 2 kg salt, 2 kg sugar and 2 kg fat. Dough mass = 168 kg. If baking loss is 12%, bread mass = 168 × 0.88 = 147.8 kg. Bread yield on flour basis = 147.8 ÷ 100 × 100 = 147.8%. The reasoning tracks total mass and applies the baking loss.
Traps
- Overmixing dough and losing gas-holding strength.
- Confusing baking powder with yeast.
- Ignoring sugar crystallization in confectionery.
- Frying at too low a temperature and increasing oil absorption.
- Reporting bread yield without accounting for baking loss.