9/28/2020 Osmotic dehydration

Osmotic dehydration Total points 19/20

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Recite the main purpose of osmotic dehydration process. 1/1

Destroy microorganisms

Reduce water activity

Increase concentration

All the above

Which process is similar to osmosis? 1/1

Radiation

Conduction

Diffusion

Convection

Identify the component which moves from a higher concentration region 1/1
to a lower region in osmosis.

Solution

Water

Organic acids

Pigments

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Name the minimum pressure which needs to be applied to a solution to 1/1

Vaccum pressure

Vapor pressure

Adiabatic pressure

osmotic pressure

Which type of transfer takes place in diffusion and osmosis? 1/1

Heat transfer

Solute transfer

Energy transfer

Mass transfer

Identify the solution used for immersing the plant tissues in osmotic 1/1
dehydration process

Hypertonic

Isotonic

Hypotonic

Hydrophilic

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Hypertonic solution has higher concentration of 1/1

Solution

Solvent

Solute

Water

Recall the driving force for osmosis. 1/1

temperature gradient

concentration gradient

volume gradient

none of the above

Which process accompanies the diffusion of water from the tissues into 1/1
the solution?

solute movement

solvent movement

solution movement

all the above

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During osmotic removal of water from foods, ___________ moves from 1/1
the food surface to the center

Dehydration front

Thermal front

When the water outflow and solute inflow mainly occurs ? 1/1

first 2-3h

4-5 h

1-6 h

3-6 h

During osmosis, the difference in water content between the food and 1/1
the osmotic solution gradually

increases

equals

decreases

none

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In homogeneous material, the diffusion coefficient _______ 1/1

constant

increases gradually

decreases gradually

increases and then decreases

The diffusion coefficient of water from the core _______ than in the 1/1
dehydration front.

higher

equal

constant

lower

Which is is an integral parameter that indicates the relative reduction in 1/1

cell permeabilization index

cell disintegration index

degree of disintegration

all the above

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How far the diffusion coefficient increases for water when high 1/1
pressures are applied?

two fold

four fold

three fold

ten fold

The water loss and solute gain increases with increase in 0/1

Temperature

Duration of treatment

Concentration of osmotic solution

All the above

Which application results in the formation of microscopic channels in the 1/1

High pressure processing

Ultrasound

High intensity pulsed electric field

All the above

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Centrifugation enhanced the mass transfer of water by about 1/1

80 %

25 %

30 %

15 %

Which phenomenon is produced by the application of sound waves. 1/1

Sonication

Cavitation

Radiation

All the above

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