EXTRATION METHODS OF PHYTOCHEMICALS

 Methods of extraction:

1. Conventional Methods:

• Maceration: The plant material is soaked in a solvent at room temperature for a period of time. This is a simple method but can be time-consuming and may not be efficient for all phytochemicals.
• Percolation: The solvent is slowly passed through a column containing the plant material. This method can be more efficient than maceration but requires specialized equipment.
• Decoction: The plant material is boiled in water for a specific period. This method is traditionally used for extracting water-soluble phytochemicals but may degrade heat-sensitive compounds.
• Infusion: Hot water is poured over the plant material and allowed to steep. This is similar to making tea and is suitable for extracting heat-sensitive compounds.
• Soxhlet Extraction: This method uses a specialized apparatus to continuously extract phytochemicals with a volatile solvent. It is efficient but can be time-consuming and may degrade heat-sensitive compounds.

2. Advanced Methods:

• Ultrasound-Assisted Extraction (UAE): Ultrasound waves are used to enhance the extraction process. This method can be faster and more efficient than conventional methods.
• Microwave-Assisted Extraction (MAE): Microwaves are used to heat the solvent and plant material, accelerating the extraction process. This method can be very fast and efficient but requires specialized equipment.
• Supercritical Fluid Extraction (SFE): A supercritical fluid, typically carbon dioxide, is used as the solvent. This method can be very selective and efficient and is often used for extracting high-value phytochemicals.
• Pressurized Liquid Extraction (PLE): Solvents are used at high pressure and temperature to extract phytochemicals. This method can be very efficient and can extract a wide range of compounds.
• Enzyme-Assisted Extraction (EAE): Enzymes are used to break down cell walls and release phytochemicals. This method can be very selective and efficient and can reduce the use of harsh solvents

Solvent extraction:

The basic principle behind solvent extraction is that different phytochemicals have varying solubilities in different solvents. This means that some compounds will dissolve more readily in one solvent than another.

The process involves

• Selection of solvent like ethanol, methanol etc.
• Then mixing and extracting the solution.
• Separating the solution from the mixture.
• Evaporating the solvent leaving the desired phytochemicals.

factors:

The factors that affect the process include

1. Polarity.
2. Temperature.
3. pH.
4. Plant material.
5. Time.

Steam distillation:

Steam distillation is a specialized separation technique used to extract volatile compounds from plant material, particularly essential oils.

working process.

1. Steam generation.
2. Passing steam through the plant material.
3. Vaporization contains the plant oils etc.
4. Condensation the cooling down of the vapor.
5. Extraction.

 Applications:

• Extracting essential oil.
• Perfumery
• Aromatherapy.

Maceration:

Maceration is one of the oldest and simplest techniques for extracting bioactive compounds from plant material.

Working process:

1. Preparation of plant by washing and drying.
2. Selection of solvent to suitable plant material.
3. Soaking the plant material is immersed into the solvent in a closed container.
4. The plant material releases in Phyto compound slowly in the solvent.
5. The liquid is filtered to get pure phytochemicals.

Advantages of maceration:

• Simplicity: It's a relatively simple and straightforward technique that doesn't require specialized equipment.
• Cost-effective: It's generally a low-cost method, as it doesn't require expensive equipment or large amounts of energy.
• Suitable for heat-sensitive compounds: It's often used for extracting compounds that are sensitive to heat, as the extraction is carried out at room temperature.

Disadvantages of maceration:

• Time-consuming: Maceration can be a slow process, requiring several days or weeks for complete extraction.
• Lower efficiency: Compared to some other extraction methods, maceration may not be as efficient in extracting all the desired compounds.
• Solvent usage: It often requires a large amount of solvent, which can be a concern for environmental and economic reasons.

Ultrasound assisted:

working process:

Ultrasound-assisted extraction (UAE) is a modern and efficient technique used to extract valuable compounds, like phytochemicals, from plant materials. It leverages the power of ultrasound waves to enhance the extraction process.

• Preparation of plant material.
• Ultrasound of 20khz is passed.
• Cavitation is formation of tiny bubbles that forms and explodes creating a local pressure.
• Cell disruption the breaking of cell wall or cell membrane.
• The ultrasound enhances the mass transfer of plant material.
• Extraction and separation process take place.

Applications of ultrasound-assisted extraction:

UAE is used in various fields, including:

• Phytochemical extraction: Isolating valuable phytochemicals from plants for research and industrial applications.
• Food industry: Extracting flavors, colors, and other compounds from plant materials for food products.
• Pharmaceutical industry: Obtaining medicinal compounds from plants for drug development.
• Environmental science: Extracting pollutants from soil and water samples.

Microwave assisted

Working process:

• Preparation of plant material.
• The mixture is placed in a microwave.
• The heat causes the plant cell to break and release of phytochemicals into the solvent.
• Enhanced mass transfer.
• Extraction.
• Separation.

Applications of microwave-assisted extraction:

MAE is used in various fields, including:

• Phytochemical extraction: Isolating valuable phytochemicals from plants for research and industrial applications.
• Food industry: Extracting flavors, colors, and other compounds from plant materials for food products.
• Pharmaceutical industry: Obtaining medicinal compounds from plants for drug development.
• Environmental science: Extracting pollutants from soil and water samples.

Pressurized extraction

Working process:

• Sample preparation.
• Solvent addition to plant material.
• Pressure of up to 1500-1700 psi and heat of 70-200°c is used.
• The extract is extracted by static equilibrium or by dynamic extraction which uses a pump.
• The final product is purified and concentrated.

Applications of pressurized liquid extraction:

PLE is used in various fields, including:

• Environmental science: Extracting pollutants from soil, sediment, and other environmental samples.
• Food science: Extracting flavors, colors, and other compounds from food matrices.
• Pharmaceuticals: Extracting active compounds from plants and other natural sources for drug development.
• Chemical industry: Extracting various compounds from solid and semi-solid materials.

Supercritical extraction

Working process:

1. Supercritical fluid such as co2 is used at controlled temperature and environment.
2. The compound comes into contact with supercritical fluid.
3. The supercritical fluid, now containing the extracted compounds, is separated from the original material.
4. By changing the pressure and/or temperature, the supercritical fluid reverts to a gas, leaving the extracted compounds behind.

Applications of supercritical fluid extraction:

SFE is used in various fields, including:

• Food and beverage industry: Decaffeinating coffee, extracting flavors and aromas, extracting hops for beer production.
• Pharmaceutical industry: Extracting active compounds from plants for drug development.
• Cosmetics industry: Extracting fragrances and other ingredients from natural sources.
• Herbal and nutraceutical industry: Extracting valuable compounds from medicinal plants.
• Environmental science: Extracting pollutants from soil and water samples.

Enzyme assisted

working process:

1. Selecting the enzyme used for extracting the phytochemical from the plant material.
2. The grinding, milling process takes place.
3. The plant material with suitable enzyme and buffer is incubated at controlled conditions.
4. The enzymes break down the cell wall of plant material.
5. After the breaking down the plant release the compunds.
6. Extratction process takes place.

Applications of enzyme-assisted extraction:

EAE is used in various fields, including:

• Phytochemical extraction: Isolating valuable phytochemicals from plants for research and industrial applications.
• Food industry: Extracting flavors, colors, and other compounds from plant materials for food products. For example, it's used to extract juice from fruits.
• Pharmaceutical industry: Obtaining medicinal compounds from plants for drug development.
• Biofuel production: Breaking down plant cell walls to release sugars for biofuel production.