C1 Plant Oils

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3 organic things containing oil
plants fruits and seeds
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why is oil extracted from these things
used in food, used for fuel
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3 ways oil is extracted
crushed and pressed, centrifuge, solvents
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what is done to the oil once extracted + why
distillation to refine it, removes water, solvents and impurities
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what do vegetable oils provide
lots of energy, vitamin E, fatty acids
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how can you cook faster using oil
they have higher boiling points than water so can cook the food at higher temperatures so takes less time
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what do oils do to the flavour
flavour is soluble in oil so the oil carries the flavour making it seem more intense
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what can be done with vegetable oils (not food wise)
turned into fuel
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what makes them suitable for this
they provide a lot of energy
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what fuel is the oil made into
biodiesel
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pro to biodiesel
burns in the same way as ordinary diesel fuel so you can use it to fuel a diesel engine
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whats the difference between monosaturated fats and polysaturated fats
mono: contain one double carbon bond in their chain poly: contain more than one double carbon bond in their chain
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why do you want to harden oils
because theyre liquid at room temperature
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how do you harden oils
reacting the oil with hydrogen in the presence of a nickel catalyst at about 60 degrees Celsius
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what is the process of hardening oils called
hydrogenation
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why do they harden in this process
the hydrogen reacts with the double bonded carbons and opens out the double bonds
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what does hydrogenation do to the properties
have higher melting points, more solid at room temperature
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why are partially hydrogenated veg oils used instead of butter in processed foods
much cheaper and they keep longer which gives them a long shelf life
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why are they considered bad
end up with trans-fats and there is evidence suggesting that they are very bad for you
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why are saturated fats bad
increases blood cholesterol level, cholesterol increases risk of heart disease
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why are unsaturated fats good
reduce amount of blood cholesterol
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why are trans-fats bad
increases cholesterol
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why is cooking with either oils bad
makes it more fattening
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Other cards in this set

Card 2

Front

why is oil extracted from these things

Back

used in food, used for fuel

Card 3

Front

3 ways oil is extracted

Back

Preview of the front of card 3

Card 4

Front

what is done to the oil once extracted + why

Back

Preview of the front of card 4

Card 5

Front

what do vegetable oils provide

Back

Preview of the front of card 5
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