Wheat flour contains two major components: starch and gluten. Starch is a carbohydrate composed of amylose and amylopectin, while gluten is a protein that gives dough its elastic properties.

Materials Required

• Wheat flour (250 g)
• Water
• Bowl
• Muslin cloth or strainer
• Beakers for collecting washings

Method Steps

1. Prepare the dough: Measure 250 g of wheat flour in a bowl. Add water gradually and knead to form a dough. Adjust with more flour if too sticky or more water if too dry.

2. Knead thoroughly: Knead the dough by hand for 10–15 minutes to develop the gluten network.

3. Wash the dough: Wrap the dough in muslin cloth and wash under cold running water. Continue until the water running out is clear.

4. Collect the products:

   • The milky water that runs off contains starch (collect and allow to settle)
   • The remaining elastic mass in the cloth is gluten (cream-colored, chewy texture)

5. Dry the starch: Allow the starch to settle, then pour off the clear water. Dry the starch on a clean surface in the sun or through air drying.

Key Points

• Gluten gives dough its elastic nature and is used in baked goods, as a binding agent, and in non-food products like adhesives
• Starch is used as a thickening agent in soups, sauces, and puddings, and in gluten-free products
• Kneading for 10–15 minutes develops the gluten network properly
• Washing removes starch granules, leaving behind pure gluten

Potato Starch

1. Select firm, undamaged potatoes and wash thoroughly
2. Peel and chop into small pieces
3. Grate or blend into a fine pulp
4. Sieve the pulp to separate starch from fibers
5. Allow starch to settle, then decant and wash multiple times
6. Dry in the sun or using air drying

Cassava Starch

1. Select mature cassava tubers and wash well
2. Peel and remove the core
3. Grate the cassava and mix with water to form a slurry
4. Strain through a fine mesh to separate starch from fiber
5. Allow to settle, then decant the water
6. Wash and dry the starch

Rice Starch

1. Wash and soak rice grains to soften them
2. Grind into a fine paste or slurry
3. Pass through screens to separate starch from other components
4. Wash multiple times to remove impurities
5. Dry the starch

Microscopic Characteristics

• Wheat starch: Honeycomb-like structure, round shape, varying sizes
• Corn starch: Polygonal shape, 5–35 microns in diameter
• Rice starch: Small, uniform, polygonal, less than 5 microns
• Potato starch: Irregular oval, 20–100 microns
• Cassava starch: Oval or spherical, 5–100 microns

Coconut oil is extracted from the flesh of mature coconuts.

Materials

• Matured coconut
• Grater or food processor
• Warm water
• Strainer
• Large pan
• Clean bottle for storage

Method Steps

1. Break the coconut and grate the flesh
2. Mix grated coconut with warm water or blend with water for 1–2 minutes
3. Strain to obtain coconut milk
4. Pour milk into a large pan and simmer over low heat for 1–2 hours
5. As the milk heats, oil rises to the top
6. Cool and strain to separate the oil
7. Store in a clean bottle

Types

• Virgin coconut oil: Unrefined, natural coconut aroma, no further processing
• Refined coconut oil: Further processed through heating, deodorizing, and bleaching

Materials

• 500 g groundnuts
• Frying pan
• Blender or mortar and pestle
• Warm water
• Muslin cloth
• Clean bottle

Method Steps

1. Sort and clean groundnuts to remove dirt and debris
2. Roast in a frying pan under mild heat to enhance flavor and facilitate oil extraction
3. Dehull (remove skins) and blend into smooth peanut butter
4. Mix peanut butter with warm water while stirring
5. Extract oil: Continue adding small amounts of water. The butter changes color from light brown to dark brown, then oil floats to the top
6. Press using muslin cloth to extract oil completely
7. Strain through fine mesh to purify
8. Heat for about 10 minutes and cool before storage

Materials

• Whole milk or cream
• Bowl
• Jar, whisk, or butter churner
• Cold water
• Strainer

Method Steps

1. Collect cream from the top of milk or through settling
2. Warm cream to room temperature (60–65°F)
3. Churn by shaking vigorously or using a whisk until butter separates from buttermilk
4. Strain to separate buttermilk
5. Wash with cold water to remove remaining buttermilk
6. Knead and shape the butter
7. Store in refrigerator or wrap in wax paper

Clarified Butter (Ghee)

1. Simmer 250 g butter for about 10 minutes until golden milk solids form at the base
2. Strain through mesh lined with paper towel
3. Store in a clean, dry bottle

Ghee has a higher smoke point (230°C) than regular butter (175°C) and is suitable for people with lactose intolerance.

A Tanzanian small-scale food vendor in Dar es Salaam can apply this knowledge by extracting coconut oil from fresh coconuts purchased at Kigamboni market to make and sell natural coconut oil for cooking or skincare, adding value to raw materials and increasing profit margins. Similarly, a mama mboga at Buguruni market can extract starch from cassava to prepare uji or as a thickening agent for sauces, reducing food costs and minimizing waste from surplus cassava tubers.