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Food Science, Preparation, and Product Quality

9 unitsabout 25 minutes6 objectivesView complete lesson

I.A.1 · Unit 2 of 9about 3 min · 4 objectives

Unit 2 of 9

Start with the food system, continued

About 3 minutes · 4 objectives · 1 check

Comparison

Plant pigment and texture responses to pH

Acids shift chlorophyll toward dull olive, turn anthocyanins redder, and help preserve firm texture. Alkaline conditions keep chlorophyll greener and shift anthocyanins bluer, but added alkali damages texture and heat-sensitive vitamins. Preservation decisions require balancing pigment stability against structural damage.
Differentiate acid from alkali by pairing pigment color changes with plant texture outcomes.
Source: Texas A&M Food Chemistry Course Materials
Text version
Acids shift chlorophyll toward dull olive, turn anthocyanins redder, and help preserve firm texture. Alkaline conditions keep chlorophyll greener and shift anthocyanins bluer, but added alkali damages texture and heat-sensitive vitamins. Preservation decisions require balancing pigment stability against structural damage.

Flour supplies starch and structure-forming proteins. Water and mixing develop gluten in wheat dough, while fat and sugar limit hydration and tenderize. Starch gelatinizes with water and heat, thickening sauces and setting crumb; cooling can promote retrogradation and firming. A batter contains enough liquid to pour or drop, whereas a dough can be handled or shaped. Biological leavening uses yeast fermentation. Chemical leavening pairs an acid with bicarbonate, sometimes in double-acting systems that release gas during mixing and heating. Beaten air and steam provide mechanical and physical leavening. Gas must be produced while proteins and starch can trap it. Too little structure loses volume; too much mixing can make a quick bread tough.

Concept map

Identify the leavening source

Classify the gas source before evaluating whether the food can trap it.
Source: Professional Baking
Text version
Yeast fermentation provides biological leavening, while an acid paired with bicarbonate provides chemical leavening. Beaten air provides mechanical leavening, and steam provides physical leavening.
Lesson sourcesLesson-level sources
Unit outline9
  1. Food structure determines process control
  2. Start with the food system, continued
  3. Scale formulas and control protein setting
  4. Structure and formulation determine food performance
  5. Ingredient functions guide preparation choices
  6. Choose the sensory test by the decision
  7. Safety and shelf life require matched controls
  8. Evaluate each food process by its evidence
  9. Solve product failures without weakening safety
Learning objectives6
  • Explain how water, carbohydrate, protein, fat, acids, gases, and dispersed phases determine food structure, stability, and ingredient function.
  • Predict how preparation methods change fruits, vegetables, sugars, grains, dairy, eggs, meats, seafood, poultry, alternatives, fats, oils, and beverages.
  • Differentiate batters, doughs, and biological, chemical, mechanical, and steam leavening and select controls for desired product quality.
  • Select food safety, processing, preservation, and packaging controls that address the relevant biological, chemical, and physical hazards.
  • Design and interpret sensory evaluation while balancing nutrient retention, safety, yield, and consumer acceptance.
  • Evaluate functional foods, food additives, biotechnology, and genetic engineering by function, evidence, safety, and regulatory context.
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