Isolation and Characterization of Lipids Flashcards
is recognized as one of the prized products derived from the fruit in the market, known for flavor, and distinct color, as well as being potentially good for human health
avocado oil
avocado oil is as nutritious as
olive oil
can be consumed either neat or added to salads
avocao oild
it could be used in the formulation of meat products to decrease the color deterioration of these products and inhibit lipid and protein oxidation
avocado oil
is also an edible oil produced from the kernel of mature coconuts and it is known for its innumerable health benefits
coconut oil
Over a thousand studies have proven, ___ oil to be one of the healthiest foods.
coconut
. The many uses and healing benefits of coconut oil go beyond people’s expectations, coconut is indeed a true ____
superfood
extraction makes use of a high-speed solid-liquid separation, so that column separation forms due to the density/weight differences
centrifugation oil extraction
generated tens of thousands of times larger than the gravity of natural sedimentation, separation, and precipitation process continuously and quickly.
centrifugal force
The huge centrifugal force in the system can achieve the separation effect in a few seconds which can be achieved by the natural gravity action of several hours in the __ tank
percipitation
materials/chemicals and reagent used
50 g/ml coconut milk
50 g/ml avocado puree (durian) (1 part avocado:1 part water; 25 grams avocado: 25 ml water)
6 Centrifuge tubes (10 ml)
Centrifuge machine/device
Water bath
Test Tubes
Transfer pipettes
Dilute acetic acid
Dilute potassium hydroxide
Ethanol, benzene, ether, acetone, chloroform, carbon tetrachloride
250 ml conical flasks
Bile salt
Whatman No. 1 filter paper
Bromine water, Acetic acid, H2SO4,
Acetic anhydride
Sudan IV
extraction of avocado oil procedure
- Mix 25 grams of avocado puree with 25 ml in a 150 mL beaker. Dispense 5.0 ml mixture into the 6 centrifuge tubes. Centrifuged at 6,000 rpm and for 20 minutes.
- Pipette out the oil into a 2 ml Eppendorf tubes and record the weight/volume (g/ml).
- The oil will appear as separate layer on top within the Eppendorf tube.
- Compute for the proportion of extracted water and oil mixture (relative to the initial 5 ml prior to centrifugation).
extraction of coconut oil procedure
- Obtain a coconut milk sample provided. Dispense 5.0 ml coconut milk into the 6 centrifuge tubes. Centrifuged at 6,000 rpm and for 20 minutes.
- Pipette out the oil and record the weight/volume in g/ml.
- Compute for the proportion of extracted oil.
rpm of centrifugation
6,000 rmp for 20 minutes
paper spot test procedures
- Rub a bit of sample on a piece of paper.
- If the spot on the paper assumes a translucent appearance, that means the sample under test is a fat or oil, i.e., a lipid.
solubility test procedures
- Take 5 ml of water, dilute acetic acid, dilute KOH, ethanol, benzene, ether, acetone, chloroform and carbon tetrachloride in nine test tubes separately.
- Add a few drops of the sample in each test tube.
- Shake well, allow the tube to stand and observe if the mixture becomes homogeneous.
emulsification test procedure
- Take 5 ml of distilled water, add a few drops of emulsifier (bile salt) and the same amount of sample in a test tube.
- Shake well to mix the contents.
- The lipid is dispersed forming an emulsion in the form of micelles, i.e., fats, which are broken up into minute droplets in water. (This is brought about as a result of the lowering of the surface tension between fat and water. The bile salts or other substances that bring about emulsification are referred to as emulsifiers.)
sudan IV test procedure
- Take a few ml of distilled water in a test tube and add a drop or two of the sample to it.
- Shake the tube so that the mixture is converted into an emulsion.
- Place a small drop of this emulsion on a micro slide and add to it a little bit Sudan IV stain, mix and put a cover glass.
- Examine under a microscope and note that only oily droplets are stained, this happens, because the stain is very specific for lipids.
bromine test for unsaturation/saturation procedure
- Take a few ml of ethanol in a test tube and add a few drops of sample to it.
- To this add a few drops of 0.4% bromine water drop by drop. (An orange color is developed.) The intensity of the color developed corresponds to the degree of unsaturation. If the same test is performed with acetic acid, no color will be developed, as it is a saturated acid.
Liebermann-Buchard Test procedure
- Take 2 ml of chloroform in a test tube and dissolve a pinch of the sample in it.
- To this add at first 8-10 drops of acetic anhydride and then a drop or two of concentrated H2SO4 from the sides of the test tube. (A greenish or greenish blue color will be developed indicating the presence of cholesterol.)
percent by weight
durian
initial weight - 7.12 g
extracted oil - 4.18 g
58.7%
percent by weight
coconut
initial weight - 3.04 g
extracted oil - 1.61g
53%
considered as good fats
unsaturated fatssr
sources of unsaturated fats
fish
nuts
olive oil
soybeans
avocado
unsaturated fats have a predominance of unsaturated fatty acids like
oleic acid
linoleic acid
docosahexaenoic acid
type of lipid that is recommended for balanced diet
unsaturated fats
promote cardiovascular and nervous system health
unsaturated fat
saturated fats have saturated fatty acids like
stearic acid
myristic acid
palmitic acid
considered as ugly fats
saturated fats
excessive consumption elevates bad cholesterol level
saturated fats
sources of saturated fats
palm oil
whole fats milk
red meat
chicken skin
exemption to this class of saturated fat is
virgin coconut oil
has medium chain saturated fatty acid
saturated fats
more readily burned into energy by our system
saturated fats
has proven antimicrobial and immune boosting properties when taking in moderation
saturated fats
contains trans-fatty acid
trans fat
partially hydrogenated oil
trans fat
artificially produced during hydrogenation of oils and fats
trans fat
sources of trans fats
highly procesed foods
doughnuts, deep fried foods, junk foods, microwaveable popcorn
detrimental to cardiovascular health
trans fat
sources are from plants such as coconut, avocado, oil palm, olive, soybean, peanut, and sesame
edible oil