FOOD  CHEMISTRY

INTRODUCTION:

Food chemistry is the study of the chemical process and interactions that occur within food. It encompasses the understanding of the composition, structure, and properties of food substances and how these factors effect taste, texture, nutritional value, and safety.

1.  Nutritional concepts: Food is primarily composed of macro nutrients (carbohydrates, proteins, and fats) and micronutrients (vitamins and minerals). Each plays a vital role in human health.
2. Flavor and Aroma: Chemical compounds such as esters, aldehydes, and terpenes contribute to the flavor and aroma of food processing and flavor enhancement.
3. Food Preservation: Techniques like fermentation , refrigeration, and canning are grounded in chemical principles to inhibit spoilage and extend shelf life.
4. Millard Reaction: This complex chemical reaction between amino acids and reducing sugars gives browned foods their distinctive flavor and color.  
5. Food Additives: Chemicals used to enhance flavor, color, and preservation, and including emulsifiers, stabilizers and antioxidants.
6. Chemical safety: Understanding harmful substances and contaminants (like pesticides or heavy metals) and their impact on food safety.

food chemistry is essential for developing new food products, improving food safety, and enhancing nutritional quality. It helps food scientists and technologists innovate while addressing consumer demands for healthier and more sustainable food options.

Chemicals present in nutritional compounds:

1. Micronutrients:

     Carbohydrates contains hydrogen,          oxygen and carbon

      Example (glucose, starch)

2. Proteins:

     Made up of amino acids which contains

       Carbon, hydrogen, oxygen and sulfur.

3. Fats (Lipids): 

     Consist of fatty acids and glycerol,        primarily made of carbon, hydrogen, and oxygen.

Micronutrients:

Vitamins: Organic compounds that are essential in small amounts (e.g., vitamin C - ascorbic acid, vitamin A - retinol).

Minerals: Inorganic elements

                   Needed for various bodily        functions.

     

Chemicals in cosmetics:

Cosmetics contain a variety of chemicals, each serving specific functions. Here are some common categories and examples:

Emollients:

Examples: Mineral oil, petrolatum, dimethicone

Function: Moisturize and soften the skin.

Surfactants:

Examples: Sodium lauryl sulfate, cocamidopropyl betaine

Function: Help cleanse by breaking down oils and dirt.

Preservatives:

Examples: Parabens, phenoxyethanol, formaldehyde releasers

Function: Prevent microbial growth and extend shelf life.

Fragrances:

Examples: Synthetic fragrance compounds, essential oils

Function: Provide scent to products.

Colorants:

Examples: Titanium dioxide, iron oxides, synthetic dyes

Function: Add color to cosmetics.

Thickeners:

Examples: Xanthan gum, carbomers

Function: Improve texture and viscosity.

Active Ingredients:

Examples: Salicylic acid (acne treatment), retinol (anti-aging)

Function: Provide specific skin benefits.

These chemicals are carefully formulated to ensure safety and efficacy in cosmetic products.

Preservatives are substances added to food and other products to prevent spoilage and extend shelf life. Common chemicals used as preservatives include:

Sodium Benzoate: Prevents the growth of mold, yeast, and some bacteria.

Potassium Sorbate: Inhibits the growth of fungi and is often used in dairy and baked goods.

Calcium Propionate: Commonly used in bread to prevent mold growth.

Sulfites: Used in dried fruits and wines to prevent oxidation and browning.

Sulfites: Used in dried fruits and wines to prevent oxidation and browning.

Nitrates and Nitrites: Used in cured meats to prevent bacterial growth and enhance color.

BHT and BHA: Antioxidants that prevent fats and oils from going rancid.

While these chemicals help maintain product integrity, some individuals may have sensitivities or allergies to certain preservatives, leading to ongoing.