Food Processing & Engineering Flashcards

What is the main objective of food processing?

Answer: To make food safe and extend shelf life

The main objective of food processing is to transform raw agricultural products into marketable food items that are safe for consumption and have an extended shelf life. Techniques like pasteurization, canning, and freezing eliminate harmful microorganisms and slow down spoilage, making food more accessible and reducing waste.

What is the importance of heat treatment in food processing?

Answer: To prevent microbial growth and ensure safety

Heat treatment, such as pasteurization, sterilization, and cooking, is a critical food processing technique. Its primary importance lies in destroying pathogenic microorganisms and spoilage enzymes, thereby making food safe for consumption and extending its shelf life. This process significantly reduces the risk of foodborne illnesses.

Why is refrigeration important in food processing?

Answer: To slow bacterial growth and preserve food

Refrigeration is a fundamental method of food preservation that works by lowering the temperature of food, which significantly slows down the metabolic activity and reproduction rate of bacteria, yeasts, and molds. This inhibition of microbial growth helps to maintain the freshness, quality, and safety of perishable foods for an extended period.

What is the purpose of packaging in food processing?

Answer: To protect and preserve food quality

Packaging plays a crucial role in food processing by providing a barrier against physical damage, contamination from microorganisms and pests, and environmental factors like oxygen, light, and moisture. It helps maintain the food's quality, freshness, and nutritional value, thereby extending its shelf life and ensuring safety until consumption.

How does dehydration preserve food?

Answer: By removing moisture to prevent microbial growth

Dehydration preserves food by significantly reducing its water content, also known as water activity. Microorganisms like bacteria, yeasts, and molds require moisture to grow and reproduce. By removing this essential water, dehydration creates an environment unsuitable for microbial proliferation, thereby preventing spoilage and extending the food's shelf life.

What is fermentation in food processing?

Answer: The process of using microorganisms to preserve and enhance food

Fermentation is a biochemical process where microorganisms, such as bacteria or yeasts, convert organic compounds in food into other substances like acids, alcohols, or gases. This process not only preserves food by inhibiting spoilage organisms but also enhances its flavor, texture, and often its nutritional profile. Examples include making yogurt, cheese, and sourdough bread.

How does pasteurization help in food safety?

Answer: By increasing the temperature to destroy harmful microorganisms

Pasteurization is a heat treatment process that involves heating food, typically liquids like milk or juice, to a specific temperature for a set period. This controlled heating effectively destroys harmful pathogenic microorganisms and significantly reduces the number of spoilage microbes. By eliminating these dangerous bacteria, pasteurization greatly improves food safety and extends the product's shelf life without drastically altering its quality.

What is the significance of controlling pH in food processing?

Answer: To prevent microbial growth and ensure food safety

Controlling pH is crucial in food processing because most spoilage and pathogenic microorganisms thrive within a specific pH range. By adjusting and often lowering the pH (making food more acidic), food processors create an environment that inhibits or prevents the growth of these undesirable microbes. This control is essential for ensuring the safety, stability, and extended shelf life of many food products.

How does food processing affect nutritional value?

Answer: It can preserve or reduce nutritional value depending on the method

Food processing can have varied effects on nutritional value, depending on the specific method used. Some processes, like freezing or canning, can help preserve nutrients by slowing degradation, while others, such as extensive heating, refining, or leaching, may reduce certain vitamins or minerals. Therefore, the impact is not uniform and depends on the processing technique employed.