Extraction methods

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Farah Amalina

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Froggy Jumps Extraction methodsVersión en línea answer all questions por Farah Amalina 1 What is the main purpose of extraction in natural product chemistry? a To separate bioactive compounds from plant materials b To identify the chemical structure of compounds c To determine the molecular weight of compounds 2 Which of the following is the correct sequence of a general extraction process? a Drying → Grinding → Extraction → Filtration → Concentration b Grinding → Drying → Extraction → Filtration c Extraction → Grinding → Drying → Filtration 3 Why is plant material usually dried before extraction? a To make the plant heavier b To prevent microbial growth and improve extraction efficiency c To remove all bioactive compounds 4 Which step removes solid plant residues from the extract? a Grinding b Drying c Filtration 5 Which factor has the greatest influence on the type of compounds extracted? a Solvent polarity b Colour of the plant c Time of harvesting 6 Which statement best describes the principle of "Like dissolves like"? a Polar solvents dissolve polar compounds. b Large molecules dissolve faster. c All solvents extract the same compounds. 7 Reducing the particle size of plant material generally will: a Decrease the extraction yield. b Increase the surface area available for solvent contact. c Reduce solvent penetration. 8 Why should extraction temperature be carefully controlled? a Heat-sensitive compounds may degrade at high temperatures. b High temperature always increases product quality. c Lower temperatures always produce higher yields 9 Which of the following factors can improve extraction efficiency by increasing contact between solvent and plant material? a Agitation (stirring or shaking) b Harvesting season c Packaging material 10 A researcher wants to extract heat-sensitive flavonoids from fresh herbal leaves. Which extraction condition is most appropriate? a Boiling with water for 2 hours b Using ethanol at room temperature c Heating at 120°C for 3 hours

Froggy Jumps

Extraction methodsVersión en línea

answer all questions

por Farah Amalina

What is the main purpose of extraction in natural product chemistry?

To separate bioactive compounds from plant materials

To identify the chemical structure of compounds

To determine the molecular weight of compounds

Which of the following is the correct sequence of a general extraction process?

Drying → Grinding → Extraction → Filtration → Concentration

Grinding → Drying → Extraction → Filtration

Extraction → Grinding → Drying → Filtration

Why is plant material usually dried before extraction?

To make the plant heavier

To prevent microbial growth and improve extraction efficiency

To remove all bioactive compounds

Which step removes solid plant residues from the extract?

Grinding

Drying

Filtration

Which factor has the greatest influence on the type of compounds extracted?

Solvent polarity

Colour of the plant

Time of harvesting

Which statement best describes the principle of "Like dissolves like"?

Polar solvents dissolve polar compounds.

Large molecules dissolve faster.

All solvents extract the same compounds.

Reducing the particle size of plant material generally will:

Decrease the extraction yield.

Increase the surface area available for solvent contact.

Reduce solvent penetration.

Why should extraction temperature be carefully controlled?

Heat-sensitive compounds may degrade at high temperatures.

High temperature always increases product quality.

Lower temperatures always produce higher yields

Which of the following factors can improve extraction efficiency by increasing contact between solvent and plant material?

Agitation (stirring or shaking)

Harvesting season

Packaging material

A researcher wants to extract heat-sensitive flavonoids from fresh herbal leaves. Which extraction condition is most appropriate?

Boiling with water for 2 hours

Using ethanol at room temperature

Heating at 120°C for 3 hours

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Extraction methods

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Extraction methodsVersión en línea

por Farah Amalina

What is the main purpose of extraction in natural product chemistry?

Which of the following is the correct sequence of a general extraction process?

Why is plant material usually dried before extraction?

Which step removes solid plant residues from the extract?

Which factor has the greatest influence on the type of compounds extracted?

Which statement best describes the principle of "Like dissolves like"?

Reducing the particle size of plant material generally will:

Why should extraction temperature be carefully controlled?

Which of the following factors can improve extraction efficiency by increasing contact between solvent and plant material?

A researcher wants to extract heat-sensitive flavonoids from fresh herbal leaves. Which extraction condition is most appropriate?