Encapsulation Techniques in Food Science
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Questions and Answers

Which method is primarily used for encapsulating heat-labile agents?

  • Spray Drying
  • Complex Coacervation (correct)
  • Coacervation
  • Solvent Evaporation
  • What does Fickian diffusion refer to in the context of microsphere encapsulation?

  • A process for increasing encapsulation efficiency
  • A method for enhancing polymer stability
  • The mechanism for release control from microspheres (correct)
  • A technique for controlling particle size
  • What is a critical factor that can influence the formation of a coacervate during the coacervation process?

  • Concentration of both polymers used
  • Particle size of the core material
  • Rate of polymer solution flow
  • Temperature and pH changes (correct)
  • In the context of spray drying, what primarily evaporates faster than water?

    <p>Flavor compounds (B)</p> Signup and view all the answers

    What is one limitation of encapsulating hydrophilic compounds?

    <p>Ineffective release rates from microspheres (A)</p> Signup and view all the answers

    What is one of the main functions of cholesterol in liposome structure?

    <p>Modulates packing of phospholipids (B)</p> Signup and view all the answers

    Which of the following is NOT a type of vesicle mentioned?

    <p>Nanolamellar vesicles (NLVs) (A)</p> Signup and view all the answers

    What is a common disadvantage of the thin film-hydration preparation method?

    <p>Low encapsulation efficiency (B)</p> Signup and view all the answers

    How does sonication primarily affect liposomes?

    <p>Reduces the size of liposomes (B)</p> Signup and view all the answers

    Which method is used to convert large liposomes to small sizes under high pressure?

    <p>High Pressure Extrusion Method (D)</p> Signup and view all the answers

    What is a key benefit of using natural emulsifiers compared to synthetic surfactants in food products?

    <p>Clean labeling requirements (A)</p> Signup and view all the answers

    Which protein is noted for its good film-forming properties and is water-soluble?

    <p>Gelatin (C)</p> Signup and view all the answers

    What advantage do gelatin-maltodextrin microcapsules provide in synbiotic yogurt?

    <p>They improve textural properties. (B)</p> Signup and view all the answers

    What is a significant characteristic of whey proteins?

    <p>They require denaturation for capsule making. (D)</p> Signup and view all the answers

    How does the combination of whey protein with citrate mung starch benefit the microencapsulation process?

    <p>It enhances the stability and solubility of poorly water-soluble compounds. (A)</p> Signup and view all the answers

    Which of the following proteins has been used to encapsulate fish oil?

    <p>Soy protein (D)</p> Signup and view all the answers

    What treatable property of whey proteins contributes to their stability?

    <p>Their water solubility (A)</p> Signup and view all the answers

    What is the role of the Ultraturrax method in microencapsulation?

    <p>To create shear and inertia stress. (C)</p> Signup and view all the answers

    What was observed regarding protein-polysaccharide microcapsules for vitamin D3?

    <p>They were determined to be suitable wall materials. (D)</p> Signup and view all the answers

    What property of curcumin allows for its effective encapsulation using caseins?

    <p>Hydrophobic regions exposure. (D)</p> Signup and view all the answers

    What is one of the applications of protein-polysaccharide microcapsules in the food industry?

    <p>Improving the stability of vitamins. (A)</p> Signup and view all the answers

    What was the primary benefit of encapsulating curcumin?

    <p>Increased dispersibility and reactivity (B)</p> Signup and view all the answers

    Which assays were used to assess the biological activity of curcumin?

    <p>Antioxidant and cell growth assays (C)</p> Signup and view all the answers

    What type of compounds were delivered using the encapsulation method discussed?

    <p>Lipophilic bioactive compounds (D)</p> Signup and view all the answers

    Which of the following interactions were important in the assembly of curcumin with pea protein isolate?

    <p>Hydrophobic interactions and hydrogen bonding (A)</p> Signup and view all the answers

    What is the role of casein nanocapsules in enhancing curcumin's bioactivity?

    <p>They facilitate better adsorption in the gastrointestinal tract. (B)</p> Signup and view all the answers

    Which of the following polyphenols were mentioned alongside curcumin in the context of nanocarriers?

    <p>Quercetin and resveratrol (A)</p> Signup and view all the answers

    What is a significant outcome of using PPI nanocarriers for curcumin?

    <p>Improved delivery and bioactivity of curcumin. (C)</p> Signup and view all the answers

    What type of health benefits could be improved by the encapsulation approach discussed?

    <p>Overall health and wellness of consumers (D)</p> Signup and view all the answers

    What aspect of the approach to encapsulation is highlighted in terms of ease of use?

    <p>It is a simple approach that can be widely applied. (C)</p> Signup and view all the answers

    What was one of the main components studied for its interaction with curcumin?

    <p>Pea protein isolate (PPI) (C)</p> Signup and view all the answers

    What is the primary benefit of using an all-aqueous system in hydrogel microspheres production?

    <p>It avoids residual solvents in the microspheres. (B)</p> Signup and view all the answers

    Which of the following is a method for microencapsulation?

    <p>Hydrogel Microsphere Production (A)</p> Signup and view all the answers

    What substance is commonly used in the hardening bath for hydrogel microspheres?

    <p>Calcium chloride solution (C)</p> Signup and view all the answers

    Which of the following proteins is NOT listed as a source for microencapsulation?

    <p>Soybean (B)</p> Signup and view all the answers

    What is the role of hydrogel in the production of microspheres?

    <p>To act as a delivery mechanism for active ingredients. (C)</p> Signup and view all the answers

    Which encapsulation technique involves using high-pressure processes?

    <p>High Hydrostatic Pressure (HHP) (D)</p> Signup and view all the answers

    What factor is crucial for the formation of micro droplets in hydrogel microsphere production?

    <p>Shear rate during extrusion (A)</p> Signup and view all the answers

    In what type of analysis is FTIR spectroscopy used?

    <p>To identify chemical structures (C)</p> Signup and view all the answers

    Which encapsulation method is characterized by a process of cooling or chilling?

    <p>Spray Cooling/Chilling (C)</p> Signup and view all the answers

    What property of protein-rich powders is likely enhanced through encapsulation?

    <p>Increased antioxidant activity (D)</p> Signup and view all the answers

    Flashcards

    Cholesterol's function in liposomes

    Cholesterol plays a crucial role in liposome structure by regulating the arrangement and movement of phospholipid molecules.

    What are liposomes?

    Liposomes are tiny spherical structures that can encapsulate and deliver various substances. They are classified based on their size and number of lipid bilayers.

    How does High Pressure Extrusion work?

    High pressure extrusion forces liposomes through tiny pores, reducing their size and creating a more uniform distribution.

    How does Sonication work?

    Sonication uses high-frequency sound waves to break down liposomes into smaller sizes.

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    How does Microfluidization work?

    Microfluidization uses high-pressure collisions to create very tiny liposomes. It involves forcing liposomes through a small channel.

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    What are Pickering emulsions?

    Pickering emulsions are stabilized by solid particles instead of traditional surfactants, offering advantages like natural origin and biodegradability.

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    What is Gelatin?

    Gelatin is a protein obtained from collagen and is commonly used as a versatile material in food technology.

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    Protein & Carbohydrate Encapsulation

    A method of encapsulating substances using a mixture of protein and carbohydrate, often used for oily substances.

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    Cricket or Meal Worm

    A source of protein used in encapsulation, often found in insect meals.

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    Water Binding Capacity

    The ability of a material to absorb and hold water.

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    Oil Binding Capacity

    The ability of a material to absorb and hold oil.

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    High Pressure Processing (HHP)

    A high-pressure processing technique used in food processing.

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    Defatting with Hexane

    A technique used to extract oil from materials.

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    FTIR Spectroscopy

    A technique used to analyze the chemical structure of materials.

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    NMR Relaxometry

    A technique used to measure the relaxation of water molecules in materials.

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    Protein Content

    The amount of protein in a sample.

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    Antioxidant Activity

    The ability of a material to protect against damage caused by oxidation.

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    Dispersibility

    The ability of a substance to disperse evenly in a liquid, like how well curcumin mixes in water.

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    Casein Nanocapsules

    Tiny capsules made of casein protein that can hold other substances. They are used to deliver things like curcumin to the body.

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    Casein

    A type of protein found in milk. It can be isolated and used to make capsules.

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    Curcumin

    A natural compound found in turmeric. It has antioxidant and anti-inflammatory properties.

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    Cell Growth Assay

    A process that measures how fast cells grow and divide. It can be used to assess how a substance affects cell growth.

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    Pea Protein Isolate (PPI)

    A protein found in peas. It can be used to make nanoparticles for delivering substances like curcumin.

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    Hydrophobic Interaction

    A type of chemical interaction where molecules stick together due to their different charges.

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    Hydrogen Bonding

    A type of chemical bond where a hydrogen atom acts as a bridge between two molecules.

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    Bioactive Compounds

    Compounds that have many benefits for health and well-being.

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    Whey protein denaturation for capsule making

    Whey protein, a soluble protein from milk, needs to be denatured to form a stable capsule. Denaturation alters the protein's structure, making it suitable for capsule formation.

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    Why is whey protein used for capsules?

    Whey protein is highly stable, meaning it retains its structure and properties over time, making it a reliable component for capsules.

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    Crosslinking whey protein

    Crosslinking is a process where whey protein molecules are linked together, creating a stronger network. This enhances the structural integrity and stability of the capsule.

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    Encapsulation of fish oil with soy protein

    Soy protein, a plant-based protein, is commonly used for encapsulation. It can effectively encapsulate and mask the taste and texture of fish oil, making it easier to incorporate into food products.

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    Curcumin encapsulation with sodium caseinate

    Curcumin, a colorful pigment found in turmeric, can benefit from encapsulation techniques. Sodium caseinate (NaCas), a milk protein, can be used as a wall material for encapsulating curcumin.

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    Sodium caseinate as a barrier for curcumin

    Sodium caseinate (NaCas), a milk protein, acts as a barrier for curcumin, protecting it from degradation and environmental factors. This improves the stability and effectiveness of curcumin.

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    Ultraturrax and Ultrasound in encapsulation

    Ultraturrax and ultrasound are methods used in creating microcapsules. Ultraturrax uses shear and inertia stress to break down materials, while ultrasound applies acoustic cavitation and power dissipation.

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    Mixing whey protein with other polysaccharides

    Microcapsules made from whey protein are often mixed with other polysaccharides to enhance their properties and create more complex structures. This combination improves the capsule's ability to encapsulate and protect the desired ingredient.

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    Spray drying in microcapsule production

    Spray drying is a common technique used in producing microcapsules. It involves spraying a liquid mixture into hot air, which evaporates the water and leaves behind the microcapsules.

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    How to control microsphere size?

    The particle size of microspheres, which are tiny spheres used in various applications, can be controlled by adjusting the size of the extruders used to create them or by modifying the flow rate of the polymer solution being processed.

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    What is complex coacervation?

    This method for encapsulating heat-sensitive substances involves creating two immiscible liquid phases in a solution: one rich in the substance being encapsulated, the other poor. This separation happens due to specific environmental conditions.

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    What is a double emulsion?

    A double emulsion involves encapsulating one substance (e.g. an oil) inside another substance (e.g. water), which is then enclosed inside a third substance (e.g. oil). This creates a layered structure ideal for encapsulating certain types of materials.

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    What is spray drying?

    Spray drying is a technique used to create dry, stable powders from various materials. It works by rapidly evaporating water from a solution or suspension using hot air. It's widely used in the food industry to preserve flavors and ingredients.

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    How is mayonnaise a double emulsion?

    Mayonnaise, a popular condiment, is an example of a double emulsion. Oil droplets are dispersed within an emulsion of water and egg yolks. This unique structure gives mayonnaise its creamy texture and flavor.

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    Study Notes

    Food Packaging: Part I

    • Food packaging is crucial for preserving fresh and processed food quality.
    • Food processing is practically impossible without packaging.
    • Very few foods are sold without packaging.
    • Good packaging prevents spoilage & maintains product quality throughout its shelf life.
    • Packaging materials include plastic, glass, paper, and metal.
    • Packaging is used for different food categories.

    Food Packaging Functions

    • Physical protection: Shielding food from mechanical damage (shock, vibration, abrasion, crushing) & preventing contamination.
    • Prevention of spoilage & contamination: Keeping food fresh, protecting from external factors (moisture, oxygen, off-flavors, toxins, microorganisms).
    • Preservation of food quality: Maintaining desirable characteristics (color, vitamins, nutrients) throughout the shelf life and ensuring food safety.
    • Product information: Providing critical consumer information (ingredients, nutritional value, use-by date, preparation instructions).
    • Convenience: Streamlining handling, storage, and consumption.
    • Facilitation of transportation & distribution: Keeping food safe during transport and easier for consumers to access it.

    Food Packaging Definition

    • Food packaging is the enclosure of food products in a specific material (e.g., pouch, bag, box, tray, can, bottle) that includes containment, protection, preservation, communication, utility, and performance functions.

    Levels of Food Packaging

    • Primary packaging: Directly touches the product and preserves it.
    • Secondary packaging: Protects the primary package and provides additional layers of protection.
    • Tertiary packaging: Used for final distribution, often corrugated paperboard, shrinkwrap, or kraft paper.

    Forms of Food Packaging

    • Rigid packaging: Maintains shape after filling.
    • Semi-rigid packaging: Maintains approximate shape but can be distorted.
    • Flexible packaging: Conforms to product shape, can be distorted easily.

    Packaging Materials

    • A variety of materials are currently used depending on the regulatory standards (FDA, EU, etc.) of specific regions.
    • Key materials are glass, paper, metal, and plastics.
    • Specific plastic types such as polymers, copolymers, substituted olefins, and polyesters are used for food packaging.
    • Other materials may be used like, Biobased plastics (starch, chitosan, polylactic acid), cellulose film.

    Lipids: Lecithin

    • Lecithin is a class of yellow-brownish lipids in plant and animal tissues.
    • It contains phosphoric acid, choline, fatty acids, glycerol, glycolipids, and phospholipids.
    • Lecithin-based food vesicles have been used for encapsulating food enzymes at relatively low temperatures.
    • Lecithins can be blended with other coating materials.

    Lipids: Liposomes

    • Liposomes are composed of natural phospholipids and may also contain chains with surfactant properties such as phosphatidylethanolamine.
    • Used as delivery vehicles for administering nutrients and pharmaceutical drugs.
    • Liposomes can be prepared by disrupting biological membranes (such as sonication) or microfluidization.

    Packaging Materials: Waxes

    • Waxes are essential derivatives of higher alcohols esterified to long-chain fatty acids.
    • Used in food packaging to extend the shelf life of fresh produce.
    • Edible waxes are highly moisture resistant.
    • Beeswax is a common example used in various food packaging applications.

    Novel Techniques for Food Packaging

    • Techniques for food packaging vary widely, including supercritical fluid extraction, microfluidization, and ultrasonication, all used to produce different microcapsules.

    Additional Food Packaging Considerations

    • Various methods—including spray drying, spray cooling, lyophilization—are used for food product encapsulation to stabilize & protect active ingredients, flavours, and other key components from temperature-sensitive substances.
    • In addition, the formation of different emulsions are also used for different product types and desired characteristics.
    • Different types of proteins can also be used as ingredients in food packaging applications, and for controlling and delivering the release of specific components.

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    Description

    This quiz covers essential methods and concepts used in encapsulating food ingredients, such as heat-labile agents and hydrophilic compounds. It explores processes like coacervation, spray drying, and liposome structure. Test your knowledge on these critical techniques and their applications in food technology.

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